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Preg Replace Callback Array in PHP 7
Preg_replace_callback_array() function in PHP 7 represents a regular expression and replaces the use of callbacks. This function returns a string or an array of strings to match a set of regular expressions and replaces them using a callback function.
Syntax
preg_replace_callback_array(patterns, input, limit, count)
Parameter Values:
- pattern − It requires an associate array to associate the regular expression patterns to callback functions.
- input/subject −It requires an array of strings to perform replacements.
- limit −It is optional. -1 is used for default, which means it is unlimited. It sets a limit to how many replacements can be done in each string.
- count −It is also optional like the limit. This variable will contain a number, indicating how many replacements were performed after the function gets to execute.
- flags −It can be a combination of the preg_offset_captureandpreg_unmatched_as_null flags, which impact the format of the matched array.
- Return Values −preg_replace_callback_array() returns a string or an array of strings.If an error is found, then it will return a null value.If matches are found, the new subject will be returned, otherwise,the subject will be returned unchanged.
Preg_replace_callback_array() : Example
<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 for the above program code is −
7 number of "a" found 4 number of "b" found 5 number of "c" found
Updated on: 2021-03-13T06:29:55+05:30
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