Print Step

<?php
    if (ob_get_level() == 0) ob_start();

    $lettr = Array('a','b','c','d','e','f','g');

    for ( $i = 0; $i < $lettr; $i++ ) {

        echo $lettr[$i] . "<br />";
            print str_pad('',4096)."\n"; /* for Chrome and Opera */

            ob_flush();
            flush();

            sleep(1);
            set_time_limit(30);

    }