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This article mainly introduces "the method of realizing regular replacement content by php". In the daily operation, I believe that many people have doubts about the method of realizing regular replacement content by php. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "the method of realizing regular replacement content by php". Next, please follow the editor to study!

Php regular replacement of content methods: 1, with preg_replace (), you can perform regular expression search and replacement, syntax "preg_filter (regular formula, replacement value, data)"; 2, with preg_filter (), syntax "preg_filter (regular expression, replacement value, data)".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use the following two functions to implement regular substitution

Preg_replace (): performs a search and replacement of a regular expression

Preg_filter (): performs a search and replacement of a regular expression

1. Use the preg_replace () function

The preg_replace () function, which performs search and replacement of regular expressions, is a powerful string substitution handler. Syntax format:

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

Search for parts of subject that match pattern and replace them with replacement.

Parameter description:

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

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

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.

Return value

If subject is an array, preg_replace () returns an array and in other cases a string.

If the match is found, the replaced subject is returned, and in other cases, the unchanged subject is returned. If an error occurs, return NULL.

Example 1: replace hello with phpcn

Example 2: delete space characters

2. Use the preg_filter () function

The preg_filter () function is also used to perform the search and replacement of a regular expression, which is equivalent to the preg_replace () function; the difference is that the preg_filter () function returns only the results of a successful match, while preg_replace () returns all the results, regardless of whether the match is successful or not.

Example: compare preg_filter () and preg_replace ()

At this point, the study on "the method of regular replacement content for php" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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