Generate random passwords length prefixed, with PHP

<?php
function random_chars( $phrase ) {
	$len = strlen( $phrase );
	$pos = mt_rand( 0, $len-1 );
	return ($phrase[$pos]);
	}

	function random_string( $charset, $len ) {
	$password = "";
		for($i=0; $i<$len; $i++) {
		$password.= random_chars( $charset );
		}
	return $password;
	}
	
$set = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcbefghijklmnopqrstuvwxyz0123456789[]+#&£$";
$p = random_string( $set, 12 );

echo("Your password is: $p");
?>

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