diff --git a/function.php b/function.php
new file mode 100644
index 0000000..fd528e6
--- /dev/null
+++ b/function.php
@@ -0,0 +1,44 @@
+<?php
+
+
+function resize($width, $height){
+	/* Get original image x y*/
+	list($w, $h) = getimagesize($_FILES['image']['tmp_name']);
+	/* calculate new image size with ratio */
+	$ratio = max($width/$w, $height/$h);
+	$h = ceil($height / $ratio);
+	$x = ($w - $width / $ratio) / 2;
+	$w = ceil($width / $ratio);
+	/* new file name */
+	$path = 'i/'.$width.'x'.$height.'_'.$_FILES['image']['name'];
+	/* read binary data from image file */
+	$imgString = file_get_contents($_FILES['image']['tmp_name']);
+	/* create image from string */
+	$image = imagecreatefromstring($imgString);
+	$tmp = imagecreatetruecolor($width, $height);
+	imagecopyresampled($tmp, $image,
+  	0, 0,
+  	$x, 0,
+  	$width, $height,
+  	$w, $h);
+	/* Save image */
+	switch ($_FILES['image']['type']) {
+		case 'image/jpeg':
+			imagejpeg($tmp, $path, 100);
+			break;
+		case 'image/png':
+			imagepng($tmp, $path, 0);
+			break;
+		case 'image/gif':
+			imagegif($tmp, $path);
+			break;
+		default:
+			exit;
+			break;
+	}
+	return $path;
+	/* cleanup memory */
+	imagedestroy($image);
+	imagedestroy($tmp);
+}
+?>