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Cod: Selectaţi tot

<?php
session_start();

// daca exista sesiunea cu codul, il retine in variabila
if(isset($_SESSION['cspm'])) $cspm = $_SESSION['cspm'];
else {
  // altfel, creaza niste caractere (numere, litere) aleatorii
  $data = date(" j-F-Y, g:i a ");
  $cspm = substr(md5($data), 3, 5);

  $_SESSION['cspm'] = $cspm;          // retine codul in sesiune
}

echo $cspm;            // afiseaza codul
?>

Cod: Selectaţi tot

Cod:
<div id="cspm"></div>
<script type="text/javascript">
function randomCode(nmr) {
  // sirul de caractere din care e ales random; si varasbila returnata
	var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz';
	var randomstring = '';

  // alege un numar de "nmr" caractere aleatorii
	for (var i=0; i<nmr; i++) {
		var rnum = Math.floor(Math.random() * chars.length);
		randomstring += chars.substring(rnum,rnum+1);
	}
	return randomstring;
}

var rand_code = randomCode(5);       // preia codul

document.getElementById('cspm').innerHTML = rand_code;       // adauga in tag-ul cu id="cspm"
alert(rand_code);            // afiseaza in fereastra Alert
</script>