密码字母数字PHP没有使用正则表达式

Question

i just try like this.

for($i=0;$i<$length;i++)
{
    if(!ctype_alpha($password[$i])
    {
        header("location:regist.php?err=Password not contain letter");

    }
    else if(!is_numeric($password[$i]))
    {
        header("location:regist.php?err=Password not contain  numbers");
    }
    else
    {
        //??
    }
}

how to validate password if the password must alphanumeric without using regular expression ?

Answer 1

I think you are looking for ctype_alnum Check- http://www.php.net/manual/en/function.ctype-alnum.php

UPDATE-

You can check for special characters in your string by something like-

<?php
$test = "password123";

$special_char = "#$%^&*()+=-[]';,./{}|:<>?~";

if (false === strpbrk($test, $special_char))
{

    echo "Good Password";
}
?>