Can php only display letters and numbers?

php can filter strings and only display letters and numbers. Implementation method: 1. Use "preg_match_all("/[a-zA-Z0-9]/u", "$str", $arr)" to find letters and numbers and store them in the array; 2. Use "join ('',$arr[0])" converts the array into a string.

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

php can filter strings, only Display letters and numbers.

In PHP, you can use the preg_match_all() function with regular expressions to filter strings and only retain English letters and numbers.

The regular expression used is: /[a-zA-Z0-9]/u

##preg_match_all() function accepts an array The third parameter of the type is used to store all matching results.

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

The array is a two-dimensional array, you can use the join() function to splice the result values ​​into a string

join('',$arr[0])

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