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This article introduces the knowledge of "how to use php rules". In the operation of practical cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Php regular usage: 1, create a PHP sample file; 2, define an array; 3, replace through the regular expression "preg_grep (" / ^ (\ d +)?\.\ dexamples / ", $array);".

This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

The use of php regularization

Function description preg_filter performs a regular expression search and replaces array entries that preg_grep returns matching patterns preg_last_error returns the last PCRE regular execution error code preg_match_all executes a global regular expression matching preg_match executes a regular expression matching preg_quote escapes regular expression characters preg_replace_callback_array performs a regular expression search And use a callback to replace preg_replace_callback to perform a regular expression search and a callback to replace preg_replace to perform a regular expression search and replace preg_split to separate strings with a regular expression

Preg_filter

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