How to replace all matching strings in php

How to replace all qualified strings in php: You can use the preg_replace() function to achieve this. The preg_replace() function is used to perform a regular expression search and replacement.

php provides a function preg_replace(), which can achieve our needs very well. Let's talk about the usage of this function.

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preg_replace function performs a regular expression search and replacement.

Full syntax:

mixed preg_replace(mixed $pattern, mixed $replacement, mixed $subject[,int $limit=-1[,int &$count]])

Return value:

If subject is an array, preg_replace() returns an array, otherwise it returns a string.

If a match is found, the replaced subject is returned, otherwise the unchanged subject is returned. If an error occurs, NULL is returned.

Example:

<?php
$str = &#39;phpcn c   n&#39;;
$str = preg_replace(&#39;/\s+/&#39;, &#39;&#39;, $str);
echo $str;
?>

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