Put methods in an array instead of hardcoding them.

index.php

@@ -45,12 +45,18 @@ if(isset($_POST['input']) && isset($_POST['type'])) {
             <br>
 
             <select class="form-control" name="type" id="type">
-                <option value="sha1">sha1</option>
-                <option value="sha256">sha256</option>
-                <option value="sha384">sha384</option>
-                <option value="sha512">sha512</option>
-                <option value="md2">md2</option>
-                <option value="md5">md5</option>
+                <?php
+                $methods = array(
+                        "sha1", "sha256", "sha384", "sha512", "md2", "md5"
+                );
+                foreach($methods as $method) {
+                    if(isset($_POST['type']) && $method == $_POST['type']) {
+	                    echo "<option value='$method' selected>$method</option>";
+                    } else {
+	                    echo "<option value='$method'>$method</option>";
+                    }
+                }
+                ?>
             </select>
 
             <br>