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In this article Xiaobian for you to introduce in detail "what are the regular replacement functions of php", the content is detailed, the steps are clear, and the details are handled properly. I hope that this article "what are the regular replacement functions of php" can help you solve your doubts? let's follow the editor's way of thinking to learn new knowledge.

The preg_filter function is used to perform a regular expression search and replacement.

Preg_filter () is equivalent to preg_replace (), but it only returns results that match the target.

Grammar

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

Parameter description

Pattern: the pattern to search for. Can be a string or an array of strings.

Replacement: the string or array of strings used for replacement.

Subject: the string or array of strings to search for and replace.

$limit: optionally, the number of times each mode is replaced on each subject. The default is-1 ().

$count: optional, number of replacements completed.

2. 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: optional, the number of replaceable times that each pattern is used for each subject string. Default is-1 (system).

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

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