验证字母数字字符串

Posted 2021-02-25

This function uses the preg_replace counter to check for any non-alphanumeric characters.

You can use this for username / password validation if you don't want any special characters to be used.

<?php			
 
	function validate_alphanum($string)
	{
		$count = 0;
		preg_replace("/[^a-zA-Z0-9]/", "", $string, -1, $count);
 
		if($count != 0)
		{
			return false;
		}
 
		return true;
	}
 
?>