How to remove symbols from string in php

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

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php removes strings Symbols in

Method 1: Use the str_replace() function--remove specified symbols

The str_replace() function can search for symbols in the string Specify the symbol and replace it with the empty character

For example: remove the ? symbol

<?php
header("Content-type:text/html;charset=utf-8");
$str = "php.cn?php中文网。zblog,?#$%^&())*(&^";
$newstr=str_replace("?","",$str);
echo $newstr;
?>

Method 2: Use preg_match_all() Function

preg_match_all() function can be used with regular expressions to filter strings, retaining only Chinese, English and numbers, and removing all other symbols

<?php
header("Content-type:text/html;charset=utf-8");
$str = "php.cn?php中文网。zblog,?#$%^&())*(&^";
preg_match_all("/[\x{4e00}-\x{9fa5}a-zA-Z0-9]/u","$str",$result);
var_dump($result);
?>

preg_match_all() function accepts a third parameter of array type to store all matching results.

You can use the join() function to splice the result array into a string

echo join('',$result[0]);

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