It creates a prononceable password by alternating vowels and consonants. I removed j, k, w, x and y because it's tuned for Italian language that doesn't have these letters. However they can be easily added back in the array below.

/** Creates a pronounceable random password
 *  @param string $len, optional length (default 8)
 *  @retrun string the generated password
 */
function make_passwd($len=8)
{
    $letter=array(
       array("b","c","d","f","g","i","l","m","n","o","p","qu","r","s","t","v","z"),
       array("a","e","i","o","u"));
    $pass="";
    $set=round(rand(0,1));
    for ($i=0; $i<$len; $i++) {
        $set=!$set;
        $idx=floor(rand(0, count($letter[$set])-1));
        $pass.=$letter[$set][$idx];
    }
    return $pass;
}