超出最大执行时间（PHP）

Question

im getting this error, and i don't know why.

Fatal error: Maximum execution time of 30 seconds exceeded in E:\web\autoopti\thanks.php on line 65

The code I have for the PHP script is:

<?php
    $key = 129;

    $email = $_REQUEST["payer_email"];
    $first = $_REQUEST["first_name"];
    $last = $_REQUEST["last_name"];
    $acode = $_REQUEST["hash"];

    $txt = $email . "|" . $email . "|" . $first . "|" . $last . "|" . $acode;
    $outtxt = '';

    for($i=0;$i<strlen($txt);)
    {
        for($j=o;$j<strlen($key);$j++,$i++)
        {
            $outtxt .= $txt{$i} ^ $key{$j};
        }
    }

    echo "thanks";
?>

And the line the error message refers to is:

$outtxt .= $txt{$i} ^ $key{$j};

So, I'm guessing it's just taking too long for this line of code to do its work. Can somebody please help me fix this?

Thank you

Answer 1

You have an infinite loop. $j starts at o (which is converted to 'o', since there is no o constant), rather than 0, and:

$j = 'o';
$j++;

results in $j = 'p' (even though 'o' + 1 is 1...)

It continues with $j eventually going from 'z' to 'aa'. Any non-numeric string is < any number, so the inner loop is infinite.

I'm not really sure what the point of the script is. But it looks like you're trying to do some home-grown encryption or hashing, which is often a mistake. Look at mcrypt and hash instead.

EDIT: My initial answer was wrong about the cause of the infinite loop.