How to create a RANDOM value?

[iBuddy]

Im triyng to create a random value of letters and numbers that is 20 characters long, anyone help with the code?

[dalecosp]

rand() is your friend.

[iBuddy]

I already looked at that and couldnt find anything with LETTERS thats all numbers....I need the exact specification above

[laserlight]

Well, what you do is the use the pseudo-random numbers generated to produce a string.
One method is to specify an array (or string) of characters that you would accept in the pseudo-random string.
Then, run a loop the required number of times, concatenating a character selected from the array, based on the number generated.

e.g.

//specficy a string of characters
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
//get the number of characters
$chars_len = strlen($chars);
//seed the Mersenne Twister Pseudo-random number generator
mt_srand((double)microtime() * 1000000);
//this will be the final result;
$result = '';
//loop 20 times, or as desired
for ($i = 0; $i < 20; $i++) {
	//generate string (or array) 0 to the last valid index
	$randnum = mt_rand(0, $chars_len - 1);
	//concatenate with the final result
	$result .= $chars{$result};
}

[dalecosp]

<?

for ($x=48; $x<=57; $x++) {
   $myarray[]=chr($x);
   }
for ($x=65; $x<=90; $x++) {
   $myarray[]=chr($x);
   }

srand(microtime*100000);
$randlist=array_rand($myarray, 20);
shuffle($randlist);
foreach ($randlist as $r) {
   echo $myarray[$r]." ";
   }
?>