olamedia .

$alphabet = "abc....xyz";
foreach (preg_split('//u', $alphabet, -1, PREG_SPLIT_NO_EMPTY) as $char){
    echo $char;
}

var update = function() {
    var val = +$('#f_lr1ro option:selected').val();
    var showFirst = [2, 3].indexOf(val) >= 0; 
    $('#f_lr1rowtd').toggle(showFirst); 
};
$(document).ready(function(){
    $('#f_lr1ro').change(update);
    update();
});

var update = function() {
    var val = +$('#f_lr1ro option:selected').val();
    var showFirst = [2, 3].indexOf(val) >= 0; 
    $('#f_lr1rowtd').toggle(showFirst); 
};
var update2 = function() {
    var val = +$('#f_lr1rowtd option:selected').val();
    var showFirst = [3, 4, 5, 6, 7, 8].indexOf(val) >= 0; 
    var showSecond = [9, 10, 11, 12].indexOf(val) >= 0; 
    $('#f_lr1rooq').toggle(showFirst);
    $('#f_lr1ronq').toggle(showSecond);
};
$(document).ready(function(){
    $('#f_lr1ro').change(update);
    $('#f_lr1rowtd').change(update2);
    update();
    update2();
});