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This article will explain in detail what is the use of the preg_replace_callback () function in PHP. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Preg_replace_callback () function

The preg_replace_callback function performs a regular expression search and replaces it with a callback.

Except that you can specify a callback instead of replacement to evaluate the replacement string, other aspects are equivalent to preg_replace ().

Grammar

Mixed preg_replace_callback (mixed $pattern, callable $callback, mixed $subject [, int $limit =-1 [, int & $count]])

Parameter description

$pattern: the pattern to search for, you can make a string or an array of strings.

Callback: a callback function that is called every time a replacement is needed, and the parameters obtained by the function are matched from the subject.

Subject: the target string or array of strings to search for replacement.

$limit: optionally, the maximum number of replaceable times per subject string for each pattern. The default is-1 (unlimited).

$count: optional, the number of times the replacement is executed.

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