<?
# http://..../intro05.php
# http://..../intro05.php?myvar=10
# "a" = char(97)
if (empty($myvar) or $myvar < 1 or $myvar > 10) { $myvar = 5; }
for($i=1;$i<=$myvar;$i++){
  $n = 96 + $i;   
  echo chr($n)."<br>";
}
$char = "a-b-c-d-e-f-g-h-i-j";
$ar = explode("-",$char);
for($i=0;$i<$myvar;$i++){  
  echo $ar[$i]." ,";
}
?>