preg_replace_callback_array() function in PHP 7-PHP Tutorial-php.cn

preg_replace_callback_array() function in PHP 7

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Release： 2023-08-19 13:42:01

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PHP 7中的preg_replace_callback_array()函数

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)

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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
   $subject = &#39;AaaaaaaBbbbCccc&#39;;
   preg_replace_callback_array (
      [
         &#39;~[a]+~i&#39; => function ($match) {
            echo strlen($match[0]), &#39; number of "a" found&#39;, PHP_EOL;
         },
         &#39;~[b]+~i&#39; => function ($match) {
            echo strlen($match[0]), &#39; number of "b" found&#39;, PHP_EOL;
         },
         &#39;~[c]+~i&#39; => function ($match) {
            echo strlen($match[0]), &#39; number of "c" found&#39;, PHP_EOL;
         }
      ],
      $subject
   );
?>
</body>
</html>

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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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