How to implement regular filtering and return numeric characters in php

This article mainly introduces php how to achieve regular filtering and return digital characters, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor with you to understand.

1. The preg_replace () function, which can search and replace regular expressions, is a string replacement handler.

Grammatical format

"preg_replace ($pattern, $replacement, $subject [, $limit =-1 [, & $count]])"

2. Search for the part of subject that matches pattern and replace it with replacement.

The optional parameter limit is used to set the maximum number of replacements (the default is-1, but there is no limit).

Example

Preg_replace ("/ [^ 0-9] /", ", $str) means to match characters other than the numbers between 09s and replace them with empty characters, that is, delete them.

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