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preg_replace_callback_array() function in PHP 7
- PHPzforward
- 2023-08-19 13:41:021553browse
The Preg_replace_callback_array() function represents a regular expression in PHP 7 and replaces the use of callback functions. This function returns a string or array of strings to match a set of regular expressions and replace them using a callback function.
Syntax
preg_replace_callback_array(patterns, input, limit, count)
Parameter value:
- pattern −It requires an associative array to associate the regular expression pattern with the callback function .
- input/subject −It requires an array of strings to perform replacement.
- limit −It is optional. By default -1 is used, meaning no limit. It sets a limit on how many substitutions can be made in each string.
- count −It is also optional, just like limit. This variable will contain a number indicating how many substitutions were made after the function was executed.
- flags −It can be a combination of preg_offset_capture and preg_unmatched_as_null flags, which affect the format of the matched array.
- Return value −preg_replace_callback_array() returns a string or string array. If an error is found, a null value is returned. If a match is found, the new subject is returned, otherwise the unchanged subject is returned.
Preg_replace_callback_array(): Example
Demonstration
<html>
<head>
<title> PHP 7 Featuretutorialpoint:</title>
</head>
<body>
<?php
$subject = 'AaaaaaaBbbbCccc';
preg_replace_callback_array (
[
'~[a]+~i' => function ($match) {
echo strlen($match[0]), ' number of "a" found', PHP_EOL;
},
'~[b]+~i' => function ($match) {
echo strlen($match[0]), ' number of "b" found', PHP_EOL;
},
'~[c]+~i' => function ($match) {
echo strlen($match[0]), ' number of "c" found', PHP_EOL;
}
],
$subject
);
?>
</body>
</html>Output
The output of the above program code is −
7 number of "a" found 4 number of "b" found 5 number of "c" found
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