MD5 PHP bad result

Question

I tried to generate hash MD5 for online payment processing and i'm getting hash invalid .

I found out that the MD5 function generates different results but I do not know why.

This is my part of code:

 $tmp="330012345211.0024-01-2014:13:07:47:357newsecret";
   $ab= md5($tmp);

$terminalid=33001;
    $orderid=23452;
    $amount=11.00;
    $datetime=0024-01-2014:13:07:47:357;
    $secret=newsecret;

  $tmp1="$terminalid"."$orderid"."$amount"."$datetime"."$secret";
    $aa=md5($tmp1);

Why is the result from $aa different than $ab ?

Answer 1

$secret=newsecret;

In $ab , newsecret is a string.

In $aa , newsecret is being used as a constant because it's not enclosed in quotes. I presume you have not defined this as a constant, so add quotes.

$secret='newsecret';

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Actually, none of your strings are enclosed in quotes.

$terminalid='33001';
$orderid='23452';
$amount='11.00';
$datetime='0024-01-2014:13:07:47:357';
$secret='newsecret';

(I'm enclosing the numbers in quotes, too, because IDs/numbers could begin with a 0 or end in .0 , which would likely be dropped when a number is implicitly typecast to a string.)

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One other thing I noticed: you probably mistakenly copied the "00" at the start of $datetime . Otherwise in $aa you'll get "...11.000024..." instead of "...11.0024..." as in $ab . Should probably be:

$datetime='24-01-2014:13:07:47:357';