Maximum execution time exceeded (PHP)

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($i=开发者_StackOverflow社区0;$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

---

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.

---

Check this out it will surely work

---

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

echo "thanks";
?>

Please see if this is the error fixed or comment me

---

There's not much to wonder about here. Your code is taking too long to run. You can increase the timeout limit in your PHP config files. I would however recommend that you use the command line PHP interpreter to see where your program is taking all these 30 seconds and then figure out how to optimise it.

---

Use set_time_limit(0) if you want to continue with your code which will ignore any timeout setting in php.ini.