Upload and Resize Image with PHP

here is a simple script for Upload and Resize an Image using PHP script:

make folder, to save uploaded image with name: pics

use this php script bellow:

<?php
 	 if(isset($_POST['Submit']))
 	 {
 	     $size = 150; // the thumbnail height
 	     $filedir = 'pics/'; // the directory for the original image
 	     $thumbdir = 'pics/'; // the directory for the thumbnail image
 	     $prefix = 'small_'; // the prefix to be added to the original name
 	     $maxfile = '2000000';
 	     $mode = '0666';
 	     $userfile_name = $_FILES['image']['name'];
 	     $userfile_tmp = $_FILES['image']['tmp_name'];
 	     $userfile_size = $_FILES['image']['size'];
 	     $userfile_type = $_FILES['image']['type'];
 	     if (isset($_FILES['image']['name'])) 
 	     {
 	         $prod_img = $filedir.$userfile_name;
 	         $prod_img_thumb = $thumbdir.$prefix.$userfile_name;
 	         move_uploaded_file($userfile_tmp, $prod_img);
 	         chmod ($prod_img, octdec($mode));
 	         $sizes = getimagesize($prod_img);
 	         $aspect_ratio = $sizes[1]/$sizes[0]; 
 	         if ($sizes[1] <= $size)
 	         {
 	             $new_width = $sizes[0];
 	             $new_height = $sizes[1];
 	         }else{
 	             $new_height = $size;
 	             $new_width = abs($new_height/$aspect_ratio);
 	         }
 	         $destimg=ImageCreateTrueColor($new_width,$new_height)
 	             or die('Problem In Creating image');
 	         $srcimg=ImageCreateFromJPEG($prod_img)
 	             or die('Problem In opening Source Image');
 	         if(function_exists('imagecopyresampled'))
 	         {
 	             imagecopyresampled($destimg,$srcimg,0,0,0,0,$new_width,$new_height,ImageSX($srcimg),ImageSY($srcimg))
 	             or die('Problem In resizing');
 	         }else{
 	             Imagecopyresized($destimg,$srcimg,0,0,0,0,$new_width,$new_height,ImageSX($srcimg),ImageSY($srcimg))
 	             or die('Problem In resizing');
 	         }
 	         ImageJPEG($destimg,$prod_img_thumb,90)
 	             or die('Problem In saving');
 	         imagedestroy($destimg);
 	     }
 	     echo '
 	     <a href="'.$prod_img.'">
 	         <img src="'.$prod_img_thumb.'" width="'.$new_width.'" heigt="'.$new_height.'">
 	     </a>';
 	 }else{
 	     echo '
 	     <form method="POST" action="'.$_SERVER['PHP_SELF'].'" enctype="multipart/form-data">
 	     <input type="file" name="image"><p>
 	     <input type="Submit" name="Submit" value="Submit">
 	     </form>';
 	 }
?>

source: http://xenno.org