note 98178 added to mcrypt.examples

Correction - the padding character count is 1-based instead of 0-based (duh). Here's the corrected function:

function decrypt($password) {
    $key = 'some key';
    $iv = 'some iv';

    $cipher = mcrypt_module_open(MCRYPT_TRIPLEDES,'','cbc','');
    mcrypt_generic_init($cipher, $key, $iv);
    $decrypted = mdecrypt_generic($cipher,$bytes);
    mcrypt_generic_deinit($cipher);

    for($i=0; $i < strlen($decrypted); $i++) {
        if(ord($decrypted[$i]) <= 8) {
            $decrypted = substr($decrypted, 0, $i);
            break;
        }
    }

    return $decrypted;
}
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Manual Page -- http://www.php.net/manual/en/mcrypt.examples.php
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