Berikut kodenya :
1. kode fangtion
<?php
error_reporting(0);
if(isset($_POST["Proses"])){
$kal1=$_POST["txtKal1"];
$kal2=$_POST["txtKal2"];
$proses=$_POST["cmbProses"];
$hasil=0;
if($proses=="Join"){
$hasil=$kal1." ".$kal2;
}
else if($proses=="Reverse"){
$array = str_split($kal1);
$gab="";
$hasil=$gab;
}//reverse
else if($proses=="Array"){
$array = str_split($kal1);
$gab="";
for($i=0;$i<count($array);$i++){
$gab=$gab.$array[$i]."|";
}
$hasil=$gab;
}//reverse
else if($proses=="Upper"){
$hasil=strtoupper($kal1);
}
else if($proses=="Lower"){
$hasil=strtolower($kal1);
}
else if($proses=="Indexof"){
$hasil=substr($kal1);
}
else if($proses=="BigLow"){
$hasil = ucfirst($kal1);
}
else if($proses=="Replace"){
$hasil=str_replace("a","x",$kal1);
}
else if($proses=="Length"){
$hasil=strlen($kal1);
}
else if($proses=="Equals"){
$hasil=strcmp($kal1,$kali2);
}
else if($proses=="Split"){
$hasil=$gab;
}
else if($proses=="Position"){
$hasil=str_indexof($kal1,$kal2);
}
else if($proses=="Encrypt"){
$hasil=crypt($kal1);
}
}//isset
?>
2. kode Select
<select name="cmbProses" id="cmbProses">
<option value="Join" <?php if($proses=="Join"){echo"selected";} ?>>Join</option>
<option value="Reverse" <?php if($proses=="Reverse"){echo"selected";} ?>>Reverse</option>
<option value="Array" <?php if($proses=="Array"){echo"selected";} ?>>Array</option>
<option value="Upper" <?php if($proses=="Upper"){echo"selected";} ?>>Upper</option>
<option value="Lower" <?php if($proses=="Lower"){echo"selected";} ?>>Lower</option>
<option value="Indexof" <?php if($proses=="Indexof"){echo"selected";} ?>>Indexof</option>
<option value="Equals" <?php if($proses=="Equals"){echo"selected";} ?>>Equals</option>
<option value="Biglow" <?php if($proses=="Biglow"){echo"selected";} ?>>Biglow</option>
<option value="Replace" <?php if($proses=="Replace"){echo"selected";} ?>>Replace</option>
<option value="Length" <?php if($proses=="Length"){echo"selected";} ?>>Length</option>
<option value="Split" <?php if($proses=="Split"){echo"selected";} ?>>Split</option>
<option value="Position" <?php if($proses=="Position"){echo"selected";} ?>>Position</option>
<option value="Encrypt" <?php if($proses=="Encrypt"){echo"selected";} ?>>Encrypt</option>
</select>
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