List service options programmatically

Make an array which holds service name and corresponding string
Print the select options into HTML with that
If an item was selected on last run, mark it as selected again.

Author: nickraptis

index.php

@@ -50,11 +50,26 @@
 
 <form name="input" action="index.php" method="get"><p>
     <select name="service">
-        <option value="traceroute">traceroute</option>
-        <option value="traceroute6">traceroute (IPv6)</option>
-        <option value="ping">ping</option>
-        <option value="ping6">ping (IPv6)</option>
-        <option value="nslookup">nslookup</option>
+    <?php
+    
+    $services_array = array(
+        "traceroute"  => "traceroute",
+        "traceroute6" => "traceroute (IPv6)",
+        "ping"        => "ping",
+        "ping6"       => "ping (IPv6)",
+        "nslookup"    => "nslookup",
+    );
+    
+    // List options programmatically
+    // output should look like
+    // <option value="ping" selected="selected">ping</option>
+    foreach($services_array as $s => $v) {
+        echo '    <option value="'.$s.'"';
+        if ($s == $_GET['service'])
+            echo ' selected="selected"';
+        echo '>'.$v.'</option>'."\n    ";
+    }
+    ?>
     </select>
     IP ADDRESS:
     <input type="text" name="address" value="<?php echo trim($_GET['address']); ?>"/>