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How can I rewrite this piece of php script to not use the deprecated function 'each' anymore in the 'if' statement ?
if (list($_basic_auth_realm, $_basic_auth_header) = each($_auth_creds))
{
...
}
Many thx in adv. for you input !
V.
[EDIT]. This if statement is not in a loop. It's part of an larger block:
if (!empty($_basic_auth_header))
{
....
}
else if (!empty($_basic_auth_realm) && isset($_auth_creds[$_basic_auth_realm]))
{
....
}
else if (list($_basic_auth_realm, $_basic_auth_header) = each($_auth_creds))
{
....
}
$_basic_auth_realm, $_basic_auth_header are strings
$_auth_creds is an array
I don't really understand how this 'if' statement works. I only attempt to update the script which returns warnings when executed. It is used as a php proxy on my NAS as was written by Abdullah Arif: https://github.com/emersion/phproxy
Use your own variable to keep track of the current index in the array, rather than depending on the internal state of the array.
$auth_creds_index = 0;
...
else if (list($_basic_auth_realm, $_basic_auth_header) = $_auth_creds[$auth_creds_index++])
Each place where you currently use each($_auth_creds) should use $_auth_creds[$auth_creds_index++], they'll get successive elements of the array.
If you reassign the variable with a new array, you need to reset the variable back to 0.
You could also define a class wrapper for the array that automates all this.
I have several older applications that throw a lot of "xyz is undefined" and "undefined offset" messages when running on the E_NOTICE error level, because the existence of variables is not explicitly checked using isset() and consorts.
I am considering working through them to make them E_NOTICE compatible, as notices about missing variables or offsets can be lifesavers, there may be some minor performance improvements to be gained, and it's overall the cleaner way.
However, I don't like what inflicting hundreds of isset() empty() and array_key_exists() s does to my code. It gets bloated, becomes less readable, without gaining anything in terms of value or meaning.
How can I structure my code without an excess of variable checks, while also being E_NOTICE compatible?
For those interested, I have expanded this topic into a small article, which provides the below information in a somewhat better structured form: The Definitive Guide To PHP's isset And empty
IMHO you should think about not just making the app "E_NOTICE compatible", but restructuring the whole thing. Having hundreds of points in your code that regularly try to use non-existent variables sounds like a rather badly structured program. Trying to access non-existent variables should never ever happen, other languages balk at this at compile time. The fact that PHP allows you to do it doesn't mean you should.
These warnings are there to help you, not to annoy you. If you get a warning "You're trying to work with something that doesn't exist!", your reaction should be "Oops, my bad, let me fix that ASAP." How else are you going to tell the difference between "variables that work just fine undefined" and honestly wrong code that may lead to serious errors? This is also the reason why you always, always, develop with error reporting turned to 11 and keep plugging away at your code until not a single NOTICE is issued. Turning error reporting off is for production environments only, to avoid information leakage and provide a better user experience even in the face of buggy code.
To elaborate:
You will always need isset or empty somewhere in your code, the only way to reduce their occurrence is to initialize your variables properly. Depending on the situation there are different ways to do that:
Function arguments:
function foo ($bar, $baz = null) { ... }
There's no need to check whether $bar or $baz are set inside the function because you just set them, all you need to worry about is if their value evaluates to true or false (or whatever else).
Regular variables anywhere:
$foo = null;
$bar = $baz = 'default value';
Initialize your variables at the top of a block of code in which you're going to use them. This solves the !isset problem, ensures that your variables always have a known default value, gives the reader an idea of what the following code will work on and thereby also serves as a sort of self-documentation.
Arrays:
$defaults = array('foo' => false, 'bar' => true, 'baz' => 'default value');
$values = array_merge($defaults, $incoming_array);
The same thing as above, you're initializing the array with default values and overwrite them with actual values.
In the remaining cases, let's say a template where you're outputting values that may or may not be set by a controller, you'll just have to check:
<table>
<?php if (!empty($foo) && is_array($foo)) : ?>
<?php foreach ($foo as $bar) : ?>
<tr>...</tr>
<?php endforeach; ?>
<?php else : ?>
<tr><td>No Foo!</td></tr>
<?php endif; ?>
</table>
If you find yourself regularly using array_key_exists, you should evaluate what you're using it for. The only time it makes a difference is here:
$array = array('key' => null);
isset($array['key']); // false
array_key_exists('key', $array); // true
As stated above though, if you're properly initializing your variables, you don't need to check if the key exists or not, because you know it does. If you're getting the array from an external source, the value will most likely not be null but '', 0, '0', false or something like it, i.e. a value you can evaluate with isset or empty, depending on your intent. If you regularly set an array key to null and want it to mean anything but false, i.e. if in the above example the differing results of isset and array_key_exists make a difference to your program logic, you should ask yourself why. The mere existence of a variable shouldn't be important, only its value should be of consequence. If the key is a true/false flag, then use true or false, not null. The only exception to this would be 3rd party libraries that want null to mean something, but since null is so hard to detect in PHP I have yet to find any library that does this.
Just write a function for that. Something like:
function get_string($array, $index, $default = null) {
if (isset($array[$index]) && strlen($value = trim($array[$index])) > 0) {
return get_magic_quotes_gpc() ? stripslashes($value) : $value;
} else {
return $default;
}
}
which you can use as
$username = get_string($_POST, 'username');
Do the same for trivial stuff like get_number(), get_boolean(), get_array() and so on.
I believe one of the best ways of coping with this problem is by accessing values of GET and POST (COOKIE, SESSION, etc.) arrays through a class.
Create a class for each of those arrays and declare __get and __set methods (overloading). __get accepts one argument which will be the name of a value. This method should check this value in the corresponding global array, either using isset() or empty() and return the value if it exists or null (or some other default value) otherwise.
After that you can confidently access array values in this manner: $POST->username and do any validation if needed without using any isset()s or empty()s. If username does not exist in the corresponding global array then null will be returned, so no warnings or notices will be generated.
I don't mind using the array_key_exists() function. In fact, I prefer using this specific function rather than relying on hack functions which may change their behavior in the future like empty and isset (strikedthrough to avoid susceptibilities).
I do however, use a simple function that comes handy in this, and some other situations in dealing with array indexes:
function Value($array, $key, $default = false)
{
if (is_array($array) === true)
{
settype($key, 'array');
foreach ($key as $value)
{
if (array_key_exists($value, $array) === false)
{
return $default;
}
$array = $array[$value];
}
return $array;
}
return $default;
}
Let's say you've the following arrays:
$arr1 = array
(
'xyz' => 'value'
);
$arr2 = array
(
'x' => array
(
'y' => array
(
'z' => 'value',
),
),
);
How do you get the "value" out of the arrays? Simple:
Value($arr1, 'xyz', 'returns this if the index does not exist');
Value($arr2, array('x', 'y', 'z'), 'returns this if the index does not exist');
We already have uni and multi-dimensional arrays covered, what else can we possibly do?
Take the following piece of code for instance:
$url = 'https://stackoverflow.com/questions/1960509';
$domain = parse_url($url);
if (is_array($domain) === true)
{
if (array_key_exists('host', $domain) === true)
{
$domain = $domain['host'];
}
else
{
$domain = 'N/A';
}
}
else
{
$domain = 'N/A';
}
Pretty boring isn't it? Here is another approach using the Value() function:
$url = 'https://stackoverflow.com/questions/1960509';
$domain = Value(parse_url($url), 'host', 'N/A');
As an additional example, take the RealIP() function for a test:
$ip = Value($_SERVER, 'HTTP_CLIENT_IP', Value($_SERVER, 'HTTP_X_FORWARDED_FOR', Value($_SERVER, 'REMOTE_ADDR')));
Neat, huh? ;)
Welcome to null coalescing operator (PHP >= 7.0.1):
$field = $_GET['field'] ?? null;
PHP says:
The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not NULL; otherwise it returns its second operand.
I'm here with you. But PHP designers has made a lot more worse mistakes than that. Short of defining a custom function for any value reading, there isn't any way around it.
I use these functions
function load(&$var) { return isset($var) ? $var : null; }
function POST($var) { return isset($_POST[$var]) ? $_POST[$var] : null; }
Examples
$y = load($x); // null, no notice
// this attitude is both readable and comfortable
if($login=POST("login") and $pass=POST("pass")) { // really =, not ==
// executes only if both login and pass were in POST
// stored in $login and $pass variables
$authorized = $login=="root" && md5($pass)=="f65b2a087755c68586568531ad8288b4";
}
Make a function which returns false if not set, and, if specified, false if empty. If valid it returns the variable. You can add more options as seen in the code below:
<?php
function isset_globals($method, $name, $option = "") {
if (isset($method[$name])) { // Check if such a variable
if ($option === "empty" && empty($method[$name])) { return false; } // Check if empty
if ($option === "stringLength" && strlen($method[$name])) { return strlen($method[$name]); } // Check length of string -- used when checking length of textareas
return ($method[$name]);
} else { return false; }
}
if (!isset_globals("$_post", "input_name", "empty")) {
echo "invalid";
} else {
/* You are safe to access the variable without worrying about errors! */
echo "you uploaded: " . $_POST["input_name"];
}
?>
Software does not magically run by the grace of god. If you are expecting something that is missing, you need to properly handle it.
If you ignore it, you are probably creating security holes in your applications. In static languages accessing a non-defined variable it is just not possible. It won't simply compile or crash your application if it's null.
Furthermore, it makes your application unmaintainable, and you are going to go mad when unexpected things happen. Language strictness is a must and PHP, by design, is wrong in so many aspects. It will make you a bad programmer if you are not aware.
I'm not sure what your definition of readability is, but proper use of empty(), isset() and try/throw/catch blocks, is pretty important to the whole process.
If your E_NOTICE is coming from $_GET or $_POST, then they should be checked against empty() right along with all the other security checks that that data should have to pass.
If it's coming from external feeds or libraries, it should be wrapped in try/catch.
If it's coming from the database, $db_num_rows() or its equivalent should be checked.
If it's coming from internal variables, they should be properly initialized. Often, these types of notices come from assigning a new variable to the return of a function that returns FALSE on a failure. Those should be wrapped in a test that, in the event of a failure, can either assign the variable an acceptable default value that the code can handle, or throwing an exception that the code can handle.
These things make the code longer, add extra blocks, and add extra tests, but I disagree with you in that I think they most definitely add extra value.
What about using the # operator?
For example:
if(#$foo) { /* Do something */ }
You may say this is bad because you have no control of what happens "inside" $foo (if it was a function call that contains a PHP error for example), but if you only use this technique for variables, this is equivalent to:
if(isset($foo) && $foo) { /* ... */ }
I have the follow code, but, i get an error in my code.
I cant find the problem but, I think it comes from:
UserManagement::findByUsername($username);
$a_allSections = UserManagement::findByUsername($username);
if($a_allSections)
{
foreach($a_allSections as $a_section)
{
echo $a_section['name'];?>
}
}
else
{
echo 'There's nothing found.' . "\n";
}
Evidently $a_allSections is not an array, so foreach complains. Use var_dump($a_allSections) to find out what exactly it is, and fix your code accordingly.
Check this way
UserManagement::findByUsername($username);
1.the function findByUsername($username) should return some values
2.the class should be included in current document.
3.Check whether your return result as array. if array means check is_array();
4.if above 3 ok in your question then you will not get the error.
$a_allSections may be empty
change condition to
if(is_array($a_allSections)){
...
}
to prevent such error on empty arrays
I have several older applications that throw a lot of "xyz is undefined" and "undefined offset" messages when running on the E_NOTICE error level, because the existence of variables is not explicitly checked using isset() and consorts.
I am considering working through them to make them E_NOTICE compatible, as notices about missing variables or offsets can be lifesavers, there may be some minor performance improvements to be gained, and it's overall the cleaner way.
However, I don't like what inflicting hundreds of isset() empty() and array_key_exists() s does to my code. It gets bloated, becomes less readable, without gaining anything in terms of value or meaning.
How can I structure my code without an excess of variable checks, while also being E_NOTICE compatible?
For those interested, I have expanded this topic into a small article, which provides the below information in a somewhat better structured form: The Definitive Guide To PHP's isset And empty
IMHO you should think about not just making the app "E_NOTICE compatible", but restructuring the whole thing. Having hundreds of points in your code that regularly try to use non-existent variables sounds like a rather badly structured program. Trying to access non-existent variables should never ever happen, other languages balk at this at compile time. The fact that PHP allows you to do it doesn't mean you should.
These warnings are there to help you, not to annoy you. If you get a warning "You're trying to work with something that doesn't exist!", your reaction should be "Oops, my bad, let me fix that ASAP." How else are you going to tell the difference between "variables that work just fine undefined" and honestly wrong code that may lead to serious errors? This is also the reason why you always, always, develop with error reporting turned to 11 and keep plugging away at your code until not a single NOTICE is issued. Turning error reporting off is for production environments only, to avoid information leakage and provide a better user experience even in the face of buggy code.
To elaborate:
You will always need isset or empty somewhere in your code, the only way to reduce their occurrence is to initialize your variables properly. Depending on the situation there are different ways to do that:
Function arguments:
function foo ($bar, $baz = null) { ... }
There's no need to check whether $bar or $baz are set inside the function because you just set them, all you need to worry about is if their value evaluates to true or false (or whatever else).
Regular variables anywhere:
$foo = null;
$bar = $baz = 'default value';
Initialize your variables at the top of a block of code in which you're going to use them. This solves the !isset problem, ensures that your variables always have a known default value, gives the reader an idea of what the following code will work on and thereby also serves as a sort of self-documentation.
Arrays:
$defaults = array('foo' => false, 'bar' => true, 'baz' => 'default value');
$values = array_merge($defaults, $incoming_array);
The same thing as above, you're initializing the array with default values and overwrite them with actual values.
In the remaining cases, let's say a template where you're outputting values that may or may not be set by a controller, you'll just have to check:
<table>
<?php if (!empty($foo) && is_array($foo)) : ?>
<?php foreach ($foo as $bar) : ?>
<tr>...</tr>
<?php endforeach; ?>
<?php else : ?>
<tr><td>No Foo!</td></tr>
<?php endif; ?>
</table>
If you find yourself regularly using array_key_exists, you should evaluate what you're using it for. The only time it makes a difference is here:
$array = array('key' => null);
isset($array['key']); // false
array_key_exists('key', $array); // true
As stated above though, if you're properly initializing your variables, you don't need to check if the key exists or not, because you know it does. If you're getting the array from an external source, the value will most likely not be null but '', 0, '0', false or something like it, i.e. a value you can evaluate with isset or empty, depending on your intent. If you regularly set an array key to null and want it to mean anything but false, i.e. if in the above example the differing results of isset and array_key_exists make a difference to your program logic, you should ask yourself why. The mere existence of a variable shouldn't be important, only its value should be of consequence. If the key is a true/false flag, then use true or false, not null. The only exception to this would be 3rd party libraries that want null to mean something, but since null is so hard to detect in PHP I have yet to find any library that does this.
Just write a function for that. Something like:
function get_string($array, $index, $default = null) {
if (isset($array[$index]) && strlen($value = trim($array[$index])) > 0) {
return get_magic_quotes_gpc() ? stripslashes($value) : $value;
} else {
return $default;
}
}
which you can use as
$username = get_string($_POST, 'username');
Do the same for trivial stuff like get_number(), get_boolean(), get_array() and so on.
I believe one of the best ways of coping with this problem is by accessing values of GET and POST (COOKIE, SESSION, etc.) arrays through a class.
Create a class for each of those arrays and declare __get and __set methods (overloading). __get accepts one argument which will be the name of a value. This method should check this value in the corresponding global array, either using isset() or empty() and return the value if it exists or null (or some other default value) otherwise.
After that you can confidently access array values in this manner: $POST->username and do any validation if needed without using any isset()s or empty()s. If username does not exist in the corresponding global array then null will be returned, so no warnings or notices will be generated.
I don't mind using the array_key_exists() function. In fact, I prefer using this specific function rather than relying on hack functions which may change their behavior in the future like empty and isset (strikedthrough to avoid susceptibilities).
I do however, use a simple function that comes handy in this, and some other situations in dealing with array indexes:
function Value($array, $key, $default = false)
{
if (is_array($array) === true)
{
settype($key, 'array');
foreach ($key as $value)
{
if (array_key_exists($value, $array) === false)
{
return $default;
}
$array = $array[$value];
}
return $array;
}
return $default;
}
Let's say you've the following arrays:
$arr1 = array
(
'xyz' => 'value'
);
$arr2 = array
(
'x' => array
(
'y' => array
(
'z' => 'value',
),
),
);
How do you get the "value" out of the arrays? Simple:
Value($arr1, 'xyz', 'returns this if the index does not exist');
Value($arr2, array('x', 'y', 'z'), 'returns this if the index does not exist');
We already have uni and multi-dimensional arrays covered, what else can we possibly do?
Take the following piece of code for instance:
$url = 'https://stackoverflow.com/questions/1960509';
$domain = parse_url($url);
if (is_array($domain) === true)
{
if (array_key_exists('host', $domain) === true)
{
$domain = $domain['host'];
}
else
{
$domain = 'N/A';
}
}
else
{
$domain = 'N/A';
}
Pretty boring isn't it? Here is another approach using the Value() function:
$url = 'https://stackoverflow.com/questions/1960509';
$domain = Value(parse_url($url), 'host', 'N/A');
As an additional example, take the RealIP() function for a test:
$ip = Value($_SERVER, 'HTTP_CLIENT_IP', Value($_SERVER, 'HTTP_X_FORWARDED_FOR', Value($_SERVER, 'REMOTE_ADDR')));
Neat, huh? ;)
Welcome to null coalescing operator (PHP >= 7.0.1):
$field = $_GET['field'] ?? null;
PHP says:
The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not NULL; otherwise it returns its second operand.
I'm here with you. But PHP designers has made a lot more worse mistakes than that. Short of defining a custom function for any value reading, there isn't any way around it.
I use these functions
function load(&$var) { return isset($var) ? $var : null; }
function POST($var) { return isset($_POST[$var]) ? $_POST[$var] : null; }
Examples
$y = load($x); // null, no notice
// this attitude is both readable and comfortable
if($login=POST("login") and $pass=POST("pass")) { // really =, not ==
// executes only if both login and pass were in POST
// stored in $login and $pass variables
$authorized = $login=="root" && md5($pass)=="f65b2a087755c68586568531ad8288b4";
}
Make a function which returns false if not set, and, if specified, false if empty. If valid it returns the variable. You can add more options as seen in the code below:
<?php
function isset_globals($method, $name, $option = "") {
if (isset($method[$name])) { // Check if such a variable
if ($option === "empty" && empty($method[$name])) { return false; } // Check if empty
if ($option === "stringLength" && strlen($method[$name])) { return strlen($method[$name]); } // Check length of string -- used when checking length of textareas
return ($method[$name]);
} else { return false; }
}
if (!isset_globals("$_post", "input_name", "empty")) {
echo "invalid";
} else {
/* You are safe to access the variable without worrying about errors! */
echo "you uploaded: " . $_POST["input_name"];
}
?>
Software does not magically run by the grace of god. If you are expecting something that is missing, you need to properly handle it.
If you ignore it, you are probably creating security holes in your applications. In static languages accessing a non-defined variable it is just not possible. It won't simply compile or crash your application if it's null.
Furthermore, it makes your application unmaintainable, and you are going to go mad when unexpected things happen. Language strictness is a must and PHP, by design, is wrong in so many aspects. It will make you a bad programmer if you are not aware.
I'm not sure what your definition of readability is, but proper use of empty(), isset() and try/throw/catch blocks, is pretty important to the whole process.
If your E_NOTICE is coming from $_GET or $_POST, then they should be checked against empty() right along with all the other security checks that that data should have to pass.
If it's coming from external feeds or libraries, it should be wrapped in try/catch.
If it's coming from the database, $db_num_rows() or its equivalent should be checked.
If it's coming from internal variables, they should be properly initialized. Often, these types of notices come from assigning a new variable to the return of a function that returns FALSE on a failure. Those should be wrapped in a test that, in the event of a failure, can either assign the variable an acceptable default value that the code can handle, or throwing an exception that the code can handle.
These things make the code longer, add extra blocks, and add extra tests, but I disagree with you in that I think they most definitely add extra value.
What about using the # operator?
For example:
if(#$foo) { /* Do something */ }
You may say this is bad because you have no control of what happens "inside" $foo (if it was a function call that contains a PHP error for example), but if you only use this technique for variables, this is equivalent to:
if(isset($foo) && $foo) { /* ... */ }
Do you consider this a code smell?
foreach((array)$foo as $bar)
{
$bar->doStuff();
}
Should i use that instead?
if (isset($foo) && is_array($foo))
{
foreach($foo as $bar)
{
$bar->doStuff();
}
}
Any other good practices to cover not set variables and assert an array?
They're both code smells. The second one is just evading all the error messages, kind of like turning off the fire alarm before you set your kitchen on fire. Both of those tell you that you have no idea what's in the variable $foo or if it's even been defined in the code above. You need to go back up through the code and find out exactly what's going on with $foo.
If it was my code, $foo would probably be always defined either as an array, or else false to indicate the array isn't needed:
if(do_we_need_an_array())
$foo = function_returning_an_array();
else
$foo = false;
[...snip...]
if($foo)
foreach($foo as $f) { ... }
If you are testing if variables are set, you can initialize them:
if (! $foo or !is_array($foo))
$foo = array();
foreach($foo as $bar)
{
$bar->doStuff();
}
Personally, I would never do the first method and always opt for the second.
If $foo should always be an array, then the second form would be much better if you did some kind of handling for the error case, e.g.:
if (isset($foo) && is_array($foo))
{
foreach($foo as $bar)
{
$bar->doStuff();
}
}
else
{
// This should not happen, exit angrily.
exit("Oh crap, foo isn't an array!");
}
Of course you don't have to just exit the application, but do whatever is appropriate in that case, maybe logging or some alternate logic.
(array)$foo != if (isset($foo) && is_array($foo))
The (array) cast can be useful for casting objects to arrays or scalars to arrays so you can create consistent interfaces to variables that may contain single values or arrays.
(array)$foo == array($foo)
As defined in the PHP Manual for Array Types.
So if you need to always use an array then the first code snippet you presented would be the answer. However type casting rules still apply so you may not get what you want, so look to the manual for more info. Otherwise the second option would prevent accessing unset variables that are not arrays.
As far as a code smell, I would say that checking for unset variables can certainly be avoided, however always knowing that a variable is going to have an array is more often than not, going to creep up. So I would aim to keep code wrapped in is_array($foo) if-then statements to a minimum.
I usually do this to make sure a foreach can handle both scalars and collections:
<?php
foreach (makeSureTraversable($scalarOrCollection) as $val)
{
// Do something.
}
function
makeSureTraversable($anything)
{
if (is_array($anything) || ($anything instanceof Traversable))
{
return $anything;
}
else
{
return array($anything);
}
}
This way I also handle classes that implement Traversable (from the SPL), which means allowing them to be used in foreaches.
if (!isset($foo) && !is_array($foo)) {
throw new InvalidArgumentException('Wrong array passed');
// Or do something to recover lost array
}
foreach($foo as $bar) {
$bar->doStuff();
}
There's quite a few times that you'd like to write a function to take one or more values for a parameter:
function getNamesById($id) { }
In this case, it would make sense that if this function was called with an array of ids, it should probably return an array of names. Similarly, to save the calling code from having to wrap the input in an array and then unwrap the output, if you just pass a scalar, then a scalar should be returned. Consider the likely contents of the function designed to handle both scalar and array parameters:
function getNamesById($id) {
$returnAnArray = is_array($id);
$output = array();
foreach ((array)$id as $theId) {
// perform some logic
$output[] = someFunction($theId);
}
return $returnAnArray ? $output : $output[0];
}
You can see that in this case, casting to an array definitely makes things a lot easier for everyone. As they say, be liberal in what you accept... As long as it is documented that it is expected that a variable could be either, then I see no problem. PHP is a duck-typed language, which has both benefits and drawbacks, but this is one of the benefits, so enjoy it!