join_strings(string $glue, string $var, string $var2 [, string $...]);
I am looking for something that would behave similar to the function I conceptualized above. A functional example would be:
$title = "Mr.";
$fname = "Jonathan";
$lname = "Sampson";
print join_strings(" ", $title, $fname, $lname); // Mr. Jonathan Sampson
After giving the documentation a quick look-over, I didn't see anything that does this. The closest I can think of is implode(), which operates on arrays - so I would have to first add the strings into an array, and then implode.
Is there already a method that exists to accomplish this, or would I need to author one from scratch?
Note: I'm familiar with concatenation (.), and building-concatenation (.=). I'm not wanting to do that (that would take place within the function). My intentions are to write the $glue variable only once. Not several times with each concatenation.
you can use join or implode, both do same thing
and as you say it needs to be an array which is not difficult
join($glue, array($va1, $var2, $var3));
You can use func_get_args() to make implode() (or its alias join()) bend to your will:
function join_strings($glue) {
$args = func_get_args();
array_shift($args);
return implode($glue, $args);
}
As the documentation for func_get_args() notes, however:
Returns an array in which each element is a copy of the corresponding member of the current user-defined function's argument list.
So you still end up making an array out of the arguments and then passing it on, except now you're letting PHP take care of that for you.
Do you have a more convincing example than the one in your question to justify not simply using implode() directly?
The only thing you're doing now is saving yourself the trouble to type array() around the variables, but that's actually shorter than the _strings you appended to the function name.
Try this:
function join_strings($glue, $arg){
$args = func_get_args();
$result = "";
$argcount = count($args)
for($i = 1; $i < $argcount; $i++){
$result .= $args[$i];
if($i+1!=count($args){
$result .= $glue;
}
}
return $result;
}
EDIT: Improved function thanks to comment suggestion
$a="hi";
$b = " world";
echo $a.$b;
While I agree with the accepted answer, see this article thats says implode is faster than join.
You'll have to use the dot "." operator.
This comes from abstract algebra theory, the strings being a monoid with respect to the concatenation operator, and the fact that when dealing with algebraic structures the dot is usually used as a generic operator (the other being "+", which you may have seen used in other languages).
For quick reference, being a monoid implies associativity of the operation, and that there exists an identity element (the empty string, in our case).
Related
I am getting an "Array to string conversion error on PHP";
I am using the "variable" (that should be a string) as the third parameter to str_replace. So in summary (very simplified version of whats going on):
$str = "very long string";
str_replace("tag", $some_other_array, $str);
$str is throwing the error, and I have been trying to fix it all day, the thing I have tried is:
if(is_array($str)) die("its somehow an array");
serialize($str); //inserted this before str_replace call.
I have spent all day on it, and no its not something stupid like variables around the wrong way - it is something bizarre. I have even dumped it to a file and its a string.
My hypothesis:
The string is too long and php can't deal with it, turns into an array.
The $str value in this case is nested and called recursively, the general flow could be explained like this:
--code
//pass by reference
function the_function ($something, &$OFFENDING_VAR, $something_else) {
while(preg_match($something, $OFFENDING_VAR)) {
$OFFENDING_VAR = str_replace($x, y, $OFFENDING_VAR); // this is the error
}
}
So it may be something strange due to str_replace, but that would mean that at some point str_replace would have to return an array.
Please help me work this out, its very confusing and I have wasted a day on it.
---- ORIGINAL FUNCTION CODE -----
//This function gets called with multiple different "Target Variables" Target is the subject
//line, from and body of the email filled with << tags >> so the str_replace function knows
//where to replace them
function perform_replacements($replacements, &$target, $clean = TRUE,
$start_tag = '<<', $end_tag = '>>', $max_substitutions = 5) {
# Construct separate tag and replacement value arrays for use in the substitution loop.
$tags = array();
$replacement_values = array();
foreach ($replacements as $tag_text => $replacement_value) {
$tags[] = $start_tag . $tag_text . $end_tag;
$replacement_values[] = $replacement_value;
}
# TODO: this badly needs refactoring
# TODO: auto upgrade <<foo>> to <<foo_html>> if foo_html exists and acting on html template
# Construct a regular expression for use in scanning for tags.
$tag_match = '/' . preg_quote($start_tag) . '\w+' . preg_quote($end_tag) . '/';
# Perform the substitution until all valid tags are replaced, or the maximum substitutions
# limit is reached.
$substitution_count = 0;
while (preg_match ($tag_match, $target) && ($substitution_count++ < $max_substitutions)) {
$target = serialize($target);
$temp = str_replace($tags,
$replacement_values,
$target); //This is the line that is failing.
unset($target);
$target = $temp;
}
if ($clean) {
# Clean up any unused search values.
$target = preg_replace($tag_match, '', $target);
}
}
How do you know $str is the problem and not $some_other_array?
From the manual:
If search and replace are arrays, then str_replace() takes a value
from each array and uses them to search and replace on subject. If
replace has fewer values than search, then an empty string is used for
the rest of replacement values. If search is an array and replace is a
string, then this replacement string is used for every value of
search. The converse would not make sense, though.
The second parameter can only be an array if the first one is as well.
I am working on a multilingual website in PHP and in my languages files i often have strings which contain multiple variables that will be later filled in to complete the sentences.
Currently i am placing {VAR_NAME} in the string and manually replacing each occurence with its matching value when used.
So basically :
{X} created a thread on {Y}
becomes :
Dany created a thread on Stack Overflow
I have already thought of sprintf but i find it inconvenient because it depends on the order of the variables which can change from a language to another.
And I have already checked How replace variable in string with value in php? and for now i basically use this method.
But i am interested in knowing if there is a built-in (or maybe not) convenient way in PHP to do that considering that i already have variables named exactly as X and Y in the previous example, more like $$ for a variable variable.
So instead of doing str_replace on the string i would maybe call a function like so :
$X = 'Dany';
$Y = 'Stack Overflow';
$lang['example'] = '{X} created a thread on {Y}';
echo parse($lang['example']);
would also print out :
Dany created a thread on Stack Overflow
Thanks!
Edit
The strings serve as templates and can be used multiple times with different inputs.
So basically doing "{$X} ... {$Y}" won't do the trick because i will lose the template and the string will be initialized with the starting values of $X and $Y which aren't yet determined.
I'm going to add an answer here because none of the current answers really cut the mustard in my view. I'll dive straight in and show you the code I would use to do this:
function parse(
/* string */ $subject,
array $variables,
/* string */ $escapeChar = '#',
/* string */ $errPlaceholder = null
) {
$esc = preg_quote($escapeChar);
$expr = "/
$esc$esc(?=$esc*+{)
| $esc{
| {(\w+)}
/x";
$callback = function($match) use($variables, $escapeChar, $errPlaceholder) {
switch ($match[0]) {
case $escapeChar . $escapeChar:
return $escapeChar;
case $escapeChar . '{':
return '{';
default:
if (isset($variables[$match[1]])) {
return $variables[$match[1]];
}
return isset($errPlaceholder) ? $errPlaceholder : $match[0];
}
};
return preg_replace_callback($expr, $callback, $subject);
}
What does that do?
In a nutshell:
Create a regular expression using the specified escape character that will match one of three sequences (more on that below)
Feed that into preg_replace_callback(), where the callback handles two of those sequences exactly and treats everything else as a replacement operation.
Return the resulting string
The regex
The regex matches any one of these three sequences:
Two occurrences of the escape character, followed by zero or more occurrences of the escape character, followed by an opening curly brace. Only the first two occurrences of the escape character are consumed. This is replaced by a single occurrence of the escape character.
A single occurrence of the escape character followed by an opening curly brace. This is replaced by a literal open curly brace.
An opening curly brace, followed by one or more perl word characters (alpha-numerics and the underscore character) followed by a closing curly brace. This is treated as a placeholder and a lookup is performed for the name between the braces in the $variables array, if it is found then return the replacement value, if not then return the value of $errPlaceholder - by default this is null, which is treated as a special case and the original placeholder is returned (i.e. the string is not modified).
Why is it better?
To understand why it's better, let's look at the replacement approaches take by other answers. With one exception (the only failing of which is compatibility with PHP<5.4 and slightly non-obvious behaviour), these fall into two categories:
strtr() - This provides no mechanism for handling an escape character. What if your input string needs a literal {X} in it? strtr() does not account for this, and it would be substituted for the value $X.
str_replace() - this suffers from the same issue as strtr(), and another problem as well. When you call str_replace() with an array argument for the search/replace arguments, it behaves as if you had called it multiple times - one for each of the array of replacement pairs. This means that if one of your replacement strings contains a value that appears later in the search array, you will end up substituting that as well.
To demonstrate this issue with str_replace(), consider the following code:
$pairs = array('A' => 'B', 'B' => 'C');
echo str_replace(array_keys($pairs), array_values($pairs), 'AB');
Now, you'd probably expect the output here to be BC but it will actually be CC (demo) - this is because the first iteration replaced A with B, and in the second iteration the subject string was BB - so both of these occurrences of B were replaced with C.
This issue also betrays a performance consideration that might not be immediately obvious - because each pair is handled separately, the operation is O(n), for each replacement pair the entire string is searched and the single replacement operation handled. If you had a very large subject string and a lot of replacement pairs, that's a sizeable operation going on under the bonnet.
Arguably this performance consideration is a non-issue - you would need a very large string and a lot of replacement pairs before you got a meaningful slowdown, but it's still worth remembering. It's also worth remembering that regex has performance penalties of its own, so in general this consideration shouldn't be included in the decision-making process.
Instead we use preg_replace_callback(). This visits any given part of the string looking for matches exactly once, within the bounds of the supplied regular expression. I add this qualifier because if you write an expression that causes catastrophic backtracking then it will be considerably more than once, but in this case that shouldn't be a problem (to help avoid this I made the only repetition in the expression possessive).
We use preg_replace_callback() instead of preg_replace() to allow us to apply custom logic while looking for the replacement string.
What this allows you to do
The original example from the question
$X = 'Dany';
$Y = 'Stack Overflow';
$lang['example'] = '{X} created a thread on {Y}';
echo parse($lang['example']);
This becomes:
$pairs = array(
'X' = 'Dany',
'Y' = 'Stack Overflow',
);
$lang['example'] = '{X} created a thread on {Y}';
echo parse($lang['example'], $pairs);
// Dany created a thread on Stack Overflow
Something more advanced
Now let's say we have:
$lang['example'] = '{X} created a thread on {Y} and it contained {X}';
// Dany created a thread on Stack Overflow and it contained Dany
...and we want the second {X} to appear literally in the resulting string. Using the default escape character of #, we would change it to:
$lang['example'] = '{X} created a thread on {Y} and it contained #{X}';
// Dany created a thread on Stack Overflow and it contained {X}
OK, looks good so far. But what if that # was supposed to be a literal?
$lang['example'] = '{X} created a thread on {Y} and it contained ##{X}';
// Dany created a thread on Stack Overflow and it contained #Dany
Note that the regular expression has been designed to only pay attention to escape sequences that immediately precede an opening curly brace. This means that you don't need to escape the escape character unless it appears immediately in front of a placeholder.
A note about the use of an array as an argument
Your original code sample uses variables named the same way as the placeholders in the string. Mine uses an array with named keys. There are two very good reasons for this:
Clarity and security - it's much easier to see what will end up being substituted, and you don't risk accidentally substituting variables you don't want to be exposed. It wouldn't be much good if someone could simply feed in {dbPass} and see your database password, now would it?
Scope - it's not possible to import variables from the calling scope unless the caller is the global scope. This makes the function useless if called from another function, and importing data from another scope is very bad practice.
If you really want to use named variables from the current scope (and I do not recommend this due to the aforementioned security issues) you can pass the result of a call to get_defined_vars() to the second argument.
A note about choosing an escape character
You'll notice I chose # as the default escape character. You can use any character (or sequence of characters, it can be more than one) by passing it to the third argument - and you may be tempted to use \ since that's what many languages use, but hold on before you do that.
The reason you don't want to use \ is because many languages use it as their own escape character, which means that when you want to specify your escape character in, say, a PHP string literal, you run into this problem:
$lang['example'] = '\\{X}'; // results in {X}
$lang['example'] = '\\\{X}'; // results in \Dany
$lang['example'] = '\\\\{X}'; // results in \Dany
It can lead to a readability nightmare, and some non-obvious behaviour with complex patterns. Pick an escape character that is not used by any other language involved (for example, if you are using this technique to generate fragments of HTML, don't use & as an escape character either).
To sum up
What you are doing has edge-cases. To solve the problem properly, you need to use a tool capable of handling those edge-cases - and when it comes to string manipulation, the tool for the job is most often regex.
Here's a portable solution, using variable variables. Yay!
$string = "I need to replace {X} and {Y}";
$X = 'something';
$Y = 'something else';
preg_match_all('/\{(.*?)\}/', $string, $matches);
foreach ($matches[1] as $value)
{
$string = str_replace('{'.$value.'}', ${$value}, $string);
}
First you set up your string, and your replacements. Then, you perform a regular expression to get an array of matches (strings within { and }, including those brackets). Finally, you loop around these and replace those with the variables you created above, using variable variables. Lovely!
Just thought I'd update this with another option even though you've marked it as correct. You don't have to use variable variables, and an array can be used in it's place.
$map = array(
'X' => 'something',
'Y' => 'something else'
);
preg_match_all('/\{(.*?)\}/', $string, $matches);
foreach ($matches[1] as $value)
{
$string = str_replace('{'.$value.'}', $map[$value], $string);
}
That would allow you to create a function with the following signature:
public function parse($string, $map); // Probably what I'd do tbh
Another option thanks to toolmakersteve in the comments does away with the need for a loop and uses strtr, but requires minor additions to the variables and single quotes instead of double quotes:
$string = 'I need to replace {$X} and {$Y}';
$map = array(
'{$X}' => 'something',
'{$Y}' => 'something else'
);
$string = strtr($string, $map);
If you're running 5.4 and you care about being able to use PHP's builtin variable interpolation in the string, you can use the bindTo() method of Closure like so:
// Strings use interpolation, but have to return themselves from an anon func
$strings = [
'en' => [
'message_sent' => function() { return "You just sent a message to $this->recipient that said: $this->message."; }
],
'es' => [
'message_sent' => function() { return "Acabas de enviar un mensaje a $this->recipient que dijo: $this->message."; }
]
];
class LocalizationScope {
private $data;
public function __construct($data) {
$this->data = $data;
}
public function __get($param) {
if(isset($this->data[$param])) {
return $this->data[$param];
}
return '';
}
}
// Bind the string anon func to an object of the array data passed in and invoke (returns string)
function localize($stringCb, $data) {
return $stringCb->bindTo(new LocalizationScope($data))->__invoke();
}
// Demo
foreach($strings as $str) {
var_dump(localize($str['message_sent'], array(
'recipient' => 'Jeff Atwood',
'message' => 'The project should be done in 6 to 8 weeks.'
)));
}
//string(93) "You just sent a message to Jeff Atwood that said: The project should be done in 6 to 8 weeks."
//string(95) "Acabas de enviar un mensaje a Jeff Atwood que dijo: The project should be done in 6 to 8 weeks."
(Codepad Demo)
Perhaps, it feels a bit hacky, and I don't particularly like using $this in this instance. But you do get the added benefit of relying on PHP's variable interpolation (which allows you to do things like escaping, that are difficult to achieve with regex).
EDIT: Added LocalizationScope, which adds another benefit: no warnings if localization anonymous functions try to access data that was not provided.
strtr is probably a better choice for this kind of things, because it replaces longest keys first:
$repls = array(
'X' => 'Dany',
'Y' => 'Stack Overflow',
);
foreach($data as $key => $value)
$repls['{' . $key . '}'] = $value;
$result = strtr($text, $repls);
(think of situations where you have keys like XX and X)
And if you don't want to use an array and instead expose all variables from the current scope:
$repls = get_defined_vars();
If your only issue with sprintf is the order of the arguments you can use argument swapping.
From the doc (http://php.net/manual/en/function.sprintf.php):
$format = 'The %2$s contains %1$d monkeys';
echo sprintf($format, $num, $location);
gettext is a widely used universal localization system that does exactly what you want.
There are libraries for most programming languages and PHP has a built-in engine.
It is driven by po-files, simple text based format, for which there are many editors around and it is compatible with sprintf syntax.
It even has some functions to deal with things like complicated plurals that some languages have.
Here are some examples of what it does. Note that _() is an alias for gettext():
echo _('Hello world'); // will output hello world in the current selected language
echo sprintf(_("%s has created a thread on %s"), $name, $site); // translates the string, and hands it over to sprintf()
echo sprintf(_("%2$s has created a thread on %1$s"), $site, $name); // same as above, but with changed order of parameters.
If you have more than a handful of strings, you should definitely use an existing engine, rather than writing your own one.
Adding a new language is just a matter of translating a list of strings and most professional translation tools can work with this file format, too.
Check Wikipedia and the PHP documentation for a basic overview on how this works:
http://en.wikipedia.org/wiki/Gettext
http://de.php.net/gettext
Google finds heaps of documentation and your favourite software repository will most likely have a handful of tools for managing po-files.
Some that I have used are:
poedit: Very light and simple. Good if you don't have too much stuff to translate and don't want to spend time thinking about how that stuff works.
Virtaal: A bit more complex and has a bit of a learning curve, but also some nice features that make your life easier. Good if you need to translate a lot.
GlotPress is a web application (from the wordpress people) that allows collaborative editing of the translation database files.
Why not use str_replace then? If you want it as template.
echo str_replace(array('{X}', '{Y}'), array($X, $Y), $lang['example']);
for every occurrence of this that you need
str_replace was built for this in the first place.
How about defining the "variable" parts as an array with keys corresponding to the placeholders in your string?
$string = "{X} created a thread on {Y}";
$values = array(
'X' => "Danny",
'Y' => "Stack Overflow",
);
echo str_replace(
array_map(function($v) { return '{'.$v.'}'; }, array_keys($values)),
array_values($values),
$string
);
Why can't you just use the template string within a function?
function threadTemplate($x, $y) {
return "{$x} created a thread on {$y}";
}
echo threadTemplate($foo, $bar);
Simple:
$X = 'Dany';
$Y = 'Stack Overflow';
$lang['example'] = "{$X} created a thread on {$Y}";
Hence:
echo $lang['example'];
Will output:
Dany created a thread on Stack Overflow
As you requested.
UPDATE:
As per the OP's comments about making the solution more portable:
Have a class do the parsing for you each time:
class MyParser {
function parse($vstr) {
return "{$x} created a thread on {$y}";
}
}
That way, if the following occurs:
$X = 3;
$Y = 4;
$a = new MyParser();
$lang['example'] = $a->parse($X, $Y);
echo $lang['example'];
Which will return:
3 created a thread on 4;
And, double checking:
$X = 'Steve';
$Y = 10.9;
$lang['example'] = $a->parse($X, $Y);
Will print:
Steve created a thread on 10.9;
As desired.
UPDATE 2:
As per the OP's comments about improving portability:
class MyParser {
function parse($vstr) {
return "{$vstr}";
}
}
$a = new MyParser();
$X = 3;
$Y = 4;
$vstr = "{$X} created a thread on {$Y}";
$a = new MyParser();
$lang['example'] = $a->parse($vstr);
echo $lang['example'];
Will output the results cited previously.
Try
$lang['example'] = "$X created a thread on $Y";
EDIT: Based on latest info
Maybe you need to look at the sprintf() function
Then you could have your template string defined as this
$template_string = '%s created a thread on %s';
$X = 'Fred';
$Y = 'Sunday';
echo sprintf( $template_string, $X, $Y );
$template_string does not change but later in your code when you have assigned different values to $X and $Y you can still use the echo sprintf( $template_string, $X, $Y );
See PHP Manual
just throwing another solution in using associative arrays. This will loop through the associative array and either replace the template or leave it blank.
example:
$list = array();
$list['X'] = 'Dany';
$list['Y'] = 'Stack Overflow';
$str = '{X} created a thread on {Y}';
$newstring = textReplaceContent($str,$list);
function textReplaceContent($contents, $list) {
while (list($key, $val) = each($list)) {
$key = "{" . $key . "}";
if ($val) {
$contents = str_replace($key, $val, $contents);
} else {
$contents = str_replace($key, "", $contents);
}
}
$final = preg_replace('/\[\w+\]/', '', $contents);
return ($final);
}
I have strings like var=test;path=test.html
I want to convert these kind of strings like the array printed below :
Array
{
var => test
path => test.html,
}
I tried to use PHP's explode function for this task, but this is converting the string to associative array, and then i decided to convert that associate array to the one shown above.
But my own code isn't what i'm looking for, 'cause it contain 2 times PHP's explode function and some foreach loops, thus my own code will not stand in the department of performance for such a simple task.
Your help will be much appreciated, thanks.
Use parse_str for this:
http://www.php.net/manual/en/function.parse-str.php
You could explode by semicolon, then explode by =, and then use array_combine().
The solution is really not all that pretty, since it's quite verbose. I typed it out just in case, but you're probably better off with another method.
$s = "var=test;path=test.html";
$b = array_map(function($x){return explode("=", $x); }, explode(";", $s));
$c1 = array_map(function($x){return $x[0]; }, $b);
$c2 = array_map(function($x){return $x[1]; }, $b);
$result = array_combine($c1, $c2);
You could use preg_match_all to get an array of keys, and an array of values, then combine them into an associative array using array_combine:
$str = "var=test;path=test.html";
preg_match_all("/([^;=]+)=([^;=]+)/", $str, $matches);
$result = array_combine($matches[1], $matches[2]);
I just figured out how you can do that by using the parse_str php built-in function.
From the php.ini documentation:
; List of separator(s) used by PHP to parse input URLs into variables.
; PHP's default setting is "&".
; NOTE: Every character in this directive is considered as separator!
; http://php.net/arg-separator.input
; Example:
;arg_separator.input = ";&"
So, if you do this:
ini_set('arg_separator.input', ';&');
The parse_str should explode query arguments both on ; and &. This shouldn't affect in any way the filling of $_GET and $_POST since they are loaded before your code execution. If you want to be sure you don't affect the behavior of any other function calling parse_str, you could use a function like this:
function my_parse_str($str, &$arr) {
$orig = ini_get('arg_separator.input');
ini_set('arg_separator.input', ';');
parse_str($str, $arr);
ini_set('arg_separator.input', $orig);
}
Two advantages over exploding on & and then on =:
Maximum execution speed since the parse_str() function is built-in
parse_str() also considers recursive splitting: a=1&a=2 -> array('a'=>array('1', '2')); or 'a[one]=1&a[two]=2' -> array('a'=>array('one'=>'1', 'two'=>'2')).
Update - performance benchmarking
I just run a test to compare the plain-php splitting vs parse_str(), on an array of 10000 query strings each made of 500 arguments. The my_parse_str() above took ~0.952 seconds, while the pure-php one (parseQueryString()) took ~4.25 seconds.
It would require a larger set of data to test exactly how much it is faster, but it's pretty clear which one wins :) (if you want the test data + scripts, I'll upload them somewhere, since the data file is 125MB).
How about str_replace?
$text = "var=test;path=test.html";
$text = str_replace(';',"\n\t", $text);
$text = str_replace('='," => ", $text);
echo <<<END
Array
{
\t$text
}
END;
You'll need to do some extra work to get the proper formatting, though
I have a really long string in a certain pattern such as:
userAccountName: abc userCompany: xyz userEmail: a#xyz.com userAddress1: userAddress2: userAddress3: userTown: ...
and so on. This pattern repeats.
I need to find a way to process this string so that I have the values of userAccountName:, userCompany:, etc. (i.e. preferably in an associative array or some such convenient format).
Is there an easy way to do this or will I have to write my own logic to split this string up into different parts?
Simple regular expressions like this userAccountName:\s*(\w+)\s+ can be used to capture matches and then use the captured matches to create a data structure.
If you can arrange for the data to be formatted as it is in a URL (ie, var=data&var2=data2) then you could use parse_str, which does almost exactly what you want, I think. Some mangling of your input data would do this in a straightforward manner.
You might have to use regex or your own logic.
Are you guaranteed that the string ": " does not appear anywhere within the values themselves? If so, you possibly could use implode to split the string into an array of alternating keys and values. You'd then have to walk through this array and format it the way you want. Here's a rough (probably inefficient) example I threw together quickly:
<?php
$keysAndValuesArray = implode(': ', $dataString);
$firstKeyName = 'userAccountName';
$associativeDataArray = array();
$currentIndex = -1;
$numItems = count($keysAndValuesArray);
for($i=0;$i<$numItems;i+=2) {
if($keysAndValuesArray[$i] == $firstKeyName) {
$associativeDataArray[] = array();
++$currentIndex;
}
$associativeDataArray[$currentIndex][$keysAndValuesArray[$i]] = $keysAndValuesArray[$i+1];
}
var_dump($associativeDataArray);
If you can write a regexp (for my example I'm considering there're no semicolons in values), you can parse it with preg_split or preg_match_all like this:
<?php
$raw_data = "userAccountName: abc userCompany: xyz";
$raw_data .= " userEmail: a#xyz.com userAddress1: userAddress2: ";
$data = array();
// /([^:]*\s+)?/ part works because the regexp is "greedy"
if (preg_match_all('/([a-z0-9_]+):\s+([^:]*\s+)?/i', $raw_data,
$items, PREG_SET_ORDER)) {
foreach ($items as $item) {
$data[$item[1]] = $item[2];
}
print_r($data);
}
?>
If that's not the case, please describe the grammar of your string in a bit more detail.
PCRE is included in PHP and can respond to your needs using regexp like:
if ($c=preg_match_all ("/userAccountName: (<userAccountName>\w+) userCompany: (<userCompany>\w+) userEmail: /", $txt, $matches))
{
$userAccountName = $matches['userAccountName'];
$userCompany = $matches['userCompany'];
// and so on...
}
the most difficult is to get the good regexp for your needs.
you can have a look at http://txt2re.com for some help
I think the solution closest to what I was looking for, I found at http://www.justin-cook.com/wp/2006/03/31/php-parse-a-string-between-two-strings/. I hope this proves useful to someone else. Thanks everyone for all the suggested solutions.
If i were you, i'll try to convert the strings in a json format with some regexp.
Then, simply use Json.
i have a string with double quote like this
$count = 5;
$str = "result: $count";
echo $str; //result: 5
variable parsing work well, and my problem is $count var must be define later than $str
$str = "result: $count";
$count = 5;
echo $str; //result:
So i will use single quote and ask a question here to finding a way to parse var whenever i want
$str = 'result: $count';
$count = 5;
//TODO: parse var process
echo $str; //result: 5
I'm will not using regex replace.
For this type of thing, I'd probably use string formatting. In PHP, that'd be printf.
?php
$str="result: %d"
....dostuff.....define $count.....
printf($str,$count)
?
edit:
although, the best way to do this probably depends partly on why you have to define $string before $count.
If it's a string that's repeated a lot, and you wanted to put it in a global variable or something, printf would be my choice, or putting it in a function as other answers have suggested.
If the string is only used once or twice, are you sure you can't refactor the code to make $count be defined before $string?
finally, a bit of bland theory:
when you write '$string = "result: $count"',
PHP immediately takes the value of $count and puts it into the string. after that, it isn't worried about $count anymore, for purposes of $string, and even if $count changes, $string won't, because it contains a literal copy of the value.
There isn't, as far as I'm aware, a way of binding a position in a string to a yet-to-be-defined variable. The 'printf' method leaves placeholders in the string, which the function printf replaces with values when you decide what should go in the placeholders.
So, if you wanted to only write
$string = "result: $count"
$count=5
$echo string
(and not have to call another function)
and get
"result: 5",
there's no way to do that. The closest method would be using placeholders and printf, but that requires an explicit call to a function, not an implicit substitution.
Why don't you use a function?
function result_str($count) { return "result: $count"; }
preg_replace is the simplest method. Something like this:
$str = preg_replace("/\\$([a-z0-9_]+)/ie", "$\\1", $str);
But if you really don't want to use a regex, then you'll have to parse the string manually, extract the variable name, and replace it.