There is this array:
$array1 = array(51=>1.1, 45=>68, 57=>43, 62=>35, 74=>24);
And I want to verify if the value that is taken from the variable starts with any of the keys from the array. (the variable is passing correctly, I checked that)
foreach (array_keys($array1) as $key1) {
if(preg_match("/^[$rvalue]/", $key1))
{
$positive1=true;
$fvalue1=$array1[$key1];
}
else{
$positive1=false;
}
}
The problem is that it runs all the array and always gives me the value of the last key, instead of one matching the variable.
I'm new with regex, so might be that, don't know. Any help is appreciated.
Seems kind of complicated for a simple task. How about at direct comparison:
foreach ($array1 as $key1 => $value) {
if (substr($rvalue, 0, strlen($key1)) == $key1)
{
$fvalue1 = $value;
break;
}
}
Just break from the loop when you find a match.
Get rid of the square brackets in the regexp. Also, you're doing the check backwards -- you want to put the keys into the regexp, and match that against the string:
if (preg_match("/^$key1/, $rvalue))
Square brackets in a regexp are used to match a single character that's any one of the characters in the bracket. So [51] matches 5 or 1, but it doesn't match the whole string 51.
You could also combine all the keys into a single regexp, using | in the regexp to specify alternatives:
$alternatives = implode('|', array_keys($array1));
if (preg_match("/^(?:$alternatives)/", $rvalue, $match)) {
$positive1 = true;
$fvalue1 = $array1[$match[0]];
} else {
$positive1 = false;
}
Related
The following is the code
<?php
$id ="202883-202882-202884-0";
$str = implode('-',array_unique(explode('-', $id)));
echo $str;
?>
The result is
202883-202882-202884-0
for $id ="202883-202882-202882-0";, result is 202883-202882-0
I would like to replace the duplicate value with zero, so that the result should be like 202883-202882-0-0, not just remove it.
and for $id ="202883-0-0-0";, result should be 202883-0-0-0. zero should not be replaced, repeating zeros are allowed.
How can I archive that?
More info:
I want to replace every duplicate numbers. Because this is for a product comparison website. There will be only maximum 4 numbers. each will be either a 6 digit number or single digit zero. all zero means no product was selected. one 6 digit number and 3 zero means, one product selected and 3 blank.
Each 6 digit number will collect data from database, I dont want to allow users to enter same number multiple times (will happen only if the number is add with the URL manually.).
Update: I understand that my question was not clear, may be my English is poor.
Here is more explanation, this function is for a smartphone comparison website.
The URL format is sitename.com/compare.html?id=202883-202882-202889-202888.
All three numbers are different smartphones(their database product ID).
I dont want to let users to type in the same product ID like id=202883-202882-202882-202888. It will not display two 202882 results in the website, but it will cause some small issues. The URL will be same without change, but the internal PHP code should consider it as id=202883-202882-202888-0.
The duplicates should be replaced as zero and added to the end.
There will be only 4 numbers separated by "-".
The following examples might clear the cloud!
if pid=202883-202882-202889-202888 the result should be 202883-202882-202889-202888
if pid=202883-202883-202883-202888 the result should be 202888-0-0-0
if pid=202883-202882-202883-202888 the result should be 202883-202882-202888-0
if pid=202882-202882-202882-202882 the result should be 202882-0-0-0
I want to allow only either 6 digit numbers or single digit zero through the string.
if pid=rgfsdg-fgsdfr4354-202883-0 the result should be 202883-0-0-0
if pid=fasdfasd-asdfads-adsfds-dasfad the result should be 0-0-0-0
if pid=4354-45882-445202882-202882 the result should be 202882-0-0-0
It is too complicated for me create, I know there are bright minds out there who can do it much more efficiently than I can.
You can do a array_unique (preserves key), then fill the gaps with 0. Sort by key and you are done :)
+ on arrays will unify the arrays but prioritizes the one on the left.
Code
$input = "0-1-1-3-1-1-3-5-0";
$array = explode('-', $input);
$result = array_unique($array) + array_fill(0, count($array), 0);
ksort($result);
var_dump(implode('-',$result));
Code (v2 - suggested by mickmackusa) - shorter and easier to understand
Fill an array of the size of the input array. And replace by leftover values from array_unique. No ksort needed. 0s will be replaced at the preserved keys of array_unique.
$input = "0-1-1-3-1-1-3-5-0";
$array = explode('-', $input);
$result = array_replace(array_fill(0, count($array), 0), array_unique($array));
var_export($result);
Working example.
Output
string(17) "0-1-0-3-0-0-0-5-0"
Working example.
references
ksort - sort by key
array_fill - generate an array filled with 0 of a certain length
This is another way to do it.
$id = "202883-202882-202882-0-234567-2-2-45435";
From the String you explode the string into an array based on the delimiter which in this case is '-'/
$id_array = explode('-', $id);
Then we can loop through the array and for every unique entry we find, we can store it in another array. Thus we are building an array as we search through the array.
$id_array_temp = [];
// Loop through the array
foreach ($id_array as $value) {
if ( in_array($value, $id_array_temp)) {
// If the entry exists, replace it with a 0
$id_array_temp[] = 0;
} else {
// If the entry does not exist, save the value so we can inspect it on the next loop.
$id_array_temp[] = $value;
}
}
At the end of this operation we will have an array of unique values with any duplicates replaced with a 0.
To recreate the string, we can use implode...
$str = implode('-', $id_array_temp);
echo $str;
Refactoring this, using a ternary to replace the If,else...
$id_array = explode('-', $id);
$id_array_temp = [];
foreach ($id_array as $value) {
$id_array_temp[] = in_array($value, $id_array_temp) ? 0 : $value;
}
$str = implode('-', $id_array_temp);
echo $str;
Output is
202883-202882-0-0-234567-2-0-45435
This appears to be a classic XY Problem.
The essential actions only need to be:
Separate the substrings in the hyphen delimited string.
Validate that the characters in each substring are in the correct format AND are unique to the set.
Only take meaningful action on qualifying value.
You see, there is no benefit to replacing/sanitizing anything when you only really need to validate the input data. Adding zeros to your input just creates more work later.
In short, you should use a direct approach similar to this flow:
if (!empty($_GET['id'])) {
$ids = array_unique(explode('-', $_GET['id']));
foreach ($ids as $id) {
if (ctype_digit($id) && strlen($id) === 6) {
// or: if (preg_match('~^\d{6}$~', $id)) {
takeYourNecessaryAction($id);
}
}
}
I have an array with elements like this:
1_elem1
2_elem2
3_elem3
Now I want to check if something in that structure is out of place. Out of place means:
The numbers in front are not succeeding
Numbers are missing
Whats the shortest way to do that in PHP? I thought of sorting the array and check if each element starts with a number. That would solve 2. I am not sure how to do 1. though.
If you can solve the 2nd problem, then you could check if the number is equivalent to the index of the array, taking into account the number of missing numbers up to that point.
Meaning that, the index of each element should be equal to the number in front.
Except when there has been a number missing in the past elements, but if you take that into account, you could include a incrementor and subtract that value.
That's a kind of combination of both arrays and regular expressions.
<?php
$arr = array( // here is our array
"1_elem1",
"4_elem2", // here is an unexpected value
"3_elem3"
);
$arr = array_values($arr); // if our array has custom keys change it to consecutive numbers
try {
array_walk($arr, function($val, $key)
{
$key++; // add 1 to the index ( because starts at 0)
$pattern = "#".$key."_elem".$key."#"; // write down our pattern
if(!preg_match($pattern, $val))
{
throw new Exception("Not in sequence: ".$val, 1); // if not in sequence then throw an error
}
});
echo "Array has sequential values";
} catch (Exception $e) {
echo $e;
die();
}
Since you asked for "shortest", how about:
function check($array) {
for ($i = count($array)-1; 0 < $i; $i--)
if (1 !== ((int)$array[$i] - (int)$array[$i-1]))
return false;
return true;
}
Start at the end walking backward, compute difference between this and previous element, if not exactly one return false. Otherwise return true. Note the typecast to int is simple way to get leading digits.
I would like to count numeric values in a group of two for equal values. For example for list of values 1,2,3,3,3,3,3,3,3,3,5,5,6
I should have 1,2,(3,3),(3,3),(3,3),(3,3),(5,5),6
That is when I decide to count the first (3,3) are counted as 1. Therefore in this case I should have $count=8 instead of $count=13 for all values. I have tried to do some for loops and if statements but I get wrong results. Any idea is highly appreciated. Thanks
Note: the pairs have to be adjacent to be regarded as 1.
$list = array(1,2,3,3,3,3,3,3,3,3,5,5,6);
$counter = 0;
foreach($list as $number)
{
if(isset($previous) and $previous === $number)
{
unset($previous);
}
else
{
$previous = $number;
$counter++;
}
}
echo $counter; // 8
Regular expression solution with back references:
$s = '1,2,3,3,3,3,3,3,3,3,5,5,6';
echo count(explode(',', preg_replace('/(\d+),\\1/', '\\1', $s)));
Output:
8
The regular expression matches a number and then uses a back reference to match the number adjacent to it. When both are matched, they are replaced by one number. The intermediate result after the preg_replace is:
1,2,3,3,3,3,5,6
After that, the count is performed on the comma separated values.
What i am trying to do is really but i am going into a lot of detail to make sure it is easily understandable.
I have a array that has a few strings in it. I then have another that has few other short strings in it usually one or two words.
I need it so that if my app finds one of the string words in the second array, in one of the first arrays string it will proceed to the next action.
So for example if one of the strings in the first array is "This is PHP Code" and then one of the strings in the second is "PHP" Then it finds a match it proceeds to the next action. I can do this using this code:
for ( $i = 0; $i < count($Array); $i++) {
$Arrays = strpos($Array[$i],$SecondArray[$i]);
if ($Arrays === false) {
echo 'Not Found Array String';
}
else {
echo 'Found Array String';
However this only compares the First Array object at the current index in the loop with the Second Array objects current index in the loop.
I need it to compare all the values in the array, so that it searches every value in the first array for the First Value in the second array, then every value in the First array for the Second value in the second array and so on.
I think i have to do two loops? I tried this but had problems with the array only returning the first value.
If anyone could help it would be appreciated!
Ill mark the correct answer and + 1 any helpful comments!
Thanks!
Maybe the following is a solution:
// loop through array1
foreach($array1 as $line) {
// check if the word is found
$word_found = false;
// explode on every word
$words = explode(" ", $line);
// loop through every word
foreach($words as $word) {
if(in_array($word, $array2)) {
$word_found = true;
break;
}
}
// if the word is found do something
if($word_found) {
echo "There is a match found.";
} else {
echo "No match found."
}
}
Should give you the result you want. I'm absolute sure there is a more efficient way to do this.. but thats for you 2 find out i quess.. good luck
You can first normalize your data and then use PHP's build in array functions to get the intersection between two arrays.
First of all convert each array with those multiple string with multiple words in there into an array only containing all words.
A helpful function to get all words from a string can be str_word_count.
Then compare those two "all words" arrays with each other using array_intersect.
Something like this:
$words1 = array_unique(str_word_count(implode(' ', $Array), 1));
$words2 = array_unique(str_word_count(implode(' ', $SecondArray), 1));
$intersection = array_intersect($words1, $words2);
if(count($intersection))
{
# there is a match!
}
function findUnit($packaging_units, $packaging)
{
foreach ($packaging_units as $packaging_unit) {
if (str_contains(strtoupper($packaging[3]), $packaging_unit)) {
return $packaging_unit;
}
}
}
Here First parameter is array and second one is variable to find
I have a list of words in which some are composed words, in example
palanca
plato
platopalanca
I need to remove "plato" and "palanca" and let only "platopalanca".
Used array_unique to remove duplicates, but those composed words are tricky...
Should I sort the list by word length and compare one by one?
A regular expression is the answer?
update: The list of words is much bigger and mixed, not only related words
update 2: I can safely implode the array into a string.
update 3: I'm trying to avoid doing this as if this was a bobble sort. there must be a more effective way of doing this
Well, I think that a buble-sort like approach is the only possible one :-(
I don't like it, but it's what i have...
Any better approach?
function sortByLengthDesc($a,$b){
return strlen($a)-strlen($b);
}
usort($words,'sortByLengthDesc');
$count = count($words);
for($i=0;$i<=$count;$i++) {
for($j=$i+1;$j<$count;$j++) {
if(strstr($words[$j], $words[$i]) ){
$delete[]=$i;
}
}
}
foreach($delete as $i) {
unset($words[$i]);
}
update 5: Sorry all. I'm A moron. Jonathan Swift make me realize I was asking the wrong question.
Given x words which START the same, I need to remove the shortests ones.
"hot, dog, stand, hotdogstand" should become "dog, stand, hotdogstand"
"car, pet, carpet" should become "pet, carpet"
"palanca, plato, platopalanca" should become "palanca, platopalanca"
"platoother, other" should be untouchedm they both start different
I think you need to define the problem a little more, so that we can give a solid answer. Here are some pathological lists. Which items should get removed?:
hot, dog, hotdogstand.
hot, dog, stand, hotdogstand
hot, dogs, stand, hotdogstand
SOME CODE
This code should be more efficient than the one you have:
$words = array('hatstand','hat','stand','hot','dog','cat','hotdogstand','catbasket');
$count = count($words);
for ($i=0; $i<=$count; $i++) {
if (isset($words[$i])) {
$len_i = strlen($words[$i]);
for ($j=$i+1; $j<$count; $j++) {
if (isset($words[$j])) {
$len_j = strlen($words[$j]);
if ($len_i<=$len_j) {
if (substr($words[$j],0,$len_i)==$words[$i]) {
unset($words[$i]);
}
} else {
if (substr($words[$i],0,$len_j)==$words[$j]) {
unset($words[$j]);
}
}
}
}
}
}
foreach ($words as $word) {
echo "$word<br>";
}
You could optimise this by storing word lengths in an array before the loops.
You can take each word and see, if any word in array starts with it or ends with it. If yes - this word should be removed (unset()).
You could put the words into an array, sort the array alphabetically and then loop through it checking if the next words start with the current index, thus being composed words. If they do, you can remove the word in the current index and the latter parts of the next words...
Something like this:
$array = array('palanca', 'plato', 'platopalanca');
// ok, the example array is already sorted alphabetically, but anyway...
sort($array);
// another array for words to be removed
$removearray = array();
// loop through the array, the last index won't have to be checked
for ($i = 0; $i < count($array) - 1; $i++) {
$current = $array[$i];
// use another loop in case there are more than one combined words
// if the words are case sensitive, use strpos() instead to compare
while ($i < count($array) && stripos($array[$i + 1], $current) === 0) {
// the next word starts with the current one, so remove current
$removearray[] = $current;
// get the other word to remove
$removearray[] = substr($next, strlen($current));
$i++;
}
}
// now just get rid of the words to be removed
// for example by joining the arrays and getting the unique words
$result = array_unique(array_merge($array, $removearray));
Regex could work. You can define within the regex where the start and end of the string applies.
^ defines the start
$ defines the end
so something like
foreach($array as $value)
{
//$term is the value that you want to remove
if(preg_match('/^' . $term . '$/', $value))
{
//Here you can be confident that $term is $value, and then either remove it from
//$array, or you can add all not-matched values to a new result array
}
}
would avoid your issue
But if you are just checking that two values are equal, == will work just as well as (and possibly faster than) preg_match
In the event that the list of $terms and $values are huge this won't come out to be the most efficient of strategies, but it is a simple solution.
If performance is an issue, sorting (note the provided sort function) the lists and then iterating down the lists side by side might be more useful. I'm going to actually test that idea before I post the code here.