PHP มือใหม่ฝึกการเขียน Loop เวอร์ชั่น 1

<?php
header( "content-type: text/html; charset=UTF-8" );
 
if ($_POST["val"] != ""){
 print "TEST 1-1<br>";
 for ($i=1; $i<=$val; $i++){
 for ($k=0; $k<$val; $k++){
 if ($k < $i) print "*";
 else print "&nbsp;&nbsp;";
 }
 print "<br>";
 }
 
 print "<br>TEST 1-2<br>";
 for ($i=1; $i<=$val; $i++){
 for ($k=$val; $k>=1; $k--){
 if ($k <= $i) print "*";
 else print "&nbsp;&nbsp;";
 }
 print "<br>";
 }
 print "<br>TEST 1-3<br>";
 for ($i=1; $i<=$val; $i++){
 for ($k=$val; $k>=1; $k--){
 if ($k >= $i) print "*";
 else print "&nbsp;&nbsp;";
 }
 print "<br>";
 }
 print "<br>TEST 1-4<br>";
 for ($i=1; $i<=$val; $i++){
 for ($k=1; $k<=$val; $k++){
 if ($k >= $i) print "*";
 else print "&nbsp;&nbsp;";
 }
 print "<br>";
 }
}
?>
<form name="form1" method="post" action="">
Input : <input type="text"  name="val" size="5" >
<input type="submit" name="Submit" value="OK" >
</form>