Generate Random ID's

[Dysan]

Hi,

 

How do I randomly generate 6 character ID's, containing characters 1-9 and A-Z (Uppercase)?

[revraz]

http://us3.php.net/rand

 

May be tougher to do alpha

[Dysan]

Ah Ha, I've come up with this. How do I convert the letters to uppercase?

 

substr(md5(uniqid(mt_rand(), true)), 0, 6);

[atlanta]

 

strtoupper(substr(md5(uniqid(mt_rand(), true)), 0, 6));

[atlanta]

oh and md5 only generates a-f not a-z

[papaface]

Google found me:

 function randomPrefix($length)
{
$random= "";

srand((double)microtime()*1000000);

$data = "AbcDE123IJKLMN67QRSTUVWXYZ";
$data .= "aBCdefghijklmn123opq45rs67tuv89wxyz";
$data .= "0FGH45OP89";

for($i = 0; $i < $length; $i++)
{
$random .= substr($data, (rand()%(strlen($data))), 1);
}

return $random;
}

randomPrefix(10); 

[tinker]

this only handles characters and doesn't seed the random function, but it's cheap and cheerful:

function genid($num)
{
$sret = "";
for($i=0;$i<$num;$i++)
{
	$sret .= chr(rand(65, 90));
}
return $sret;
}
print genid(6);

[kanikilu]

This is a quick-n-dirty alternative I came up with:

 

<?php
$num = range(0,9); // 0-9
$ascii = range(65,90); // ASCII codes for A-Z
foreach ($ascii as $key => $value) {
  $char[$key] = chr($value);
}
$mixed = array_merge($num, $char);
$rand_keys = array_rand($mixed, 6);
foreach ($rand_keys as $value) {
  $charID .= $mixed[$value];
}
echo $charID;
?>

 

Note, this won't necessarily give you numbers AND alpha characters all the time, I tried it several times and twice there were all alpha's, and the others were a mix of both...

[The Little Guy]

This will do the trick: http://phpsnips.com/snippet.php?id=24

 

You can change the length to what ever you want!