How to remove symbols from a string by php

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Methods: 1, remove the specified symbols with "str_replace (" specified symbols ",", $str) "; 2, use" preg_match_all ("/ [\ x {4e00} -\ x {9fa5} a-zA-Z0-9] / u", "$str", $result); filter out all symbols.

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

Php removes symbols from a string

Method 1: use the str_replace () function to remove the specified symbol

The str_replace () function searches for a specified symbol in a string and replaces it with an empty character.

For example: get rid of? Symbol

Method 2: use the preg_match_all () function

The preg_match_all () function can filter strings with regular expressions, leaving only Chinese, English and numbers, and removing all other symbols.

The preg_match_all () function takes a third argument of an array type, which is used to store all matching results.

You can use the join () function to concatenate the resulting array into a string

Echo join ('', $result [0])

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