<?php
$a="aa /SASDFASDFSAD bb";
echo toLowString($a);
function toUpString($trans_before){
$trans_after="";
foreach (range(0,strlen($trans_before)-1) as $num) {
$ascii=ord($trans_before[$num]);
$ascii_range=$ascii - 97;
if(96<$ascii&&$ascii<123){
$trans_after=$trans_after.chr(65+$ascii_range);
}else{
$trans_after=$trans_after.$trans_before[$num];
}
}
return $trans_after;
}
function toLowString($trans_before){
$trans_after="";
foreach (range(0,strlen($trans_before)-1) as $num) {
$ascii=ord($trans_before[$num]);
$ascii_range=$ascii - 65;
if(64<$ascii&&$ascii<91){
$trans_after=$trans_after.chr(97+$ascii_range);
}else{
$trans_after=$trans_after.$trans_before[$num];
}
}
return $trans_after;
}