Algis Alekna

Often I need to generate a random string for a password, a ref code or something. So I have made this little PHP class. It is configured to use caps and digits.

For example, if you need to make up a reference number, something like H7-UE4-3GG, here is the sample code:

$gen = new aaRandomPasswordGenerator;
$gen->useLetters = false;
$gen->useCaps = true;
$gen->useDigits = true;

$components = array();
$components[] = $gen->generate( 2 );
$components[] = $gen->generate( 3 );
$components[] = $gen->generate( 3 );

$refno = join( '-', $components );

Class code:

class aaRandomPasswordGenerator {
	var $useLetters;
	var $useCaps;
	var $useDigits;

	function aaRandomPasswordGenerator(){
		$this->lettersSalt = 'abcdefghijklmnopqrstuvxyz';
		$this->capsSalt = 'ABCDEFGHIJKLMNOPQRSTUVXYZ';
		$this->digitsSalt = '0123456789';

		$this->useLetters = true;
		$this->useCaps = true;
		$this->useDigits = true;
		}

	function generate( $len ){
		$salt = '';
		if( $this->useLetters )
			$salt .= $this->lettersSalt;
		if( $this->useDigits )
			$salt .= $this->digitsSalt;
		if( $this->useCaps )
			$salt .= $this->capsSalt;

		srand( (double) microtime() * 1000000 );
		$pass = '';
		$i = 1;
		while ( $i <= $len ){
			$num = rand() % strlen($salt);
			$tmp = substr($salt, $num, 1);
			$pass .= $tmp;
			$i++;
			}

		return $pass;
		}
	}