NYCPHP Meetup

[Joseph Crawford]

the way i currently have it is like this

define('SES_KEY', md5('CUSTOM_STRING'));

$key = 
md5($_SERVER['HTTP_USER_AGENT'].SES_KEY.session_id().$data['ses_start']);
$key = str_mix($key, SES_KEY);

this will create a key 64 chars long. i needed a way to have it mix the 
strings but mix them the same way every time so str_shuffle would not work 
for me. I created the following function which just takes the first char 
from str1 and str2 and combines like so

str1_1.str2_1.str1_2.str2_2.str1_3.str2_3, etc..

function str_mix($str1, $str2) {
if(strlen($str1) != strlen($str2)) return FALSE;
else {
$len1 = strlen($str1) - 1;
$string = '';
for($x = 0; $x <= $len1; $x++) {
$string .= $str1{$x}.$str2{$x};
}
return $string;
}
}

i take this string and store it in the database next to the session_id. 
Every page load i create this string based on my custom string and the user 
info, and then i compare it with the one in the database. if they match 
everything is ok, if not, something is wrong.

-- 
Joseph Crawford Jr.
Codebowl Solutions, Inc.
1-802-671-2021
codebowl at gmail.com
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