Upload and Resize an Image with PHP

<?php
 
define ("MAX_SIZE","400");
 
$errors=0;
 
if($_SERVER["REQUEST_METHOD"] == "POST")
{
$image =$_FILES["file"]["name"];
$uploadedfile = $_FILES['file']['tmp_name'];
 
if ($image)
{
$filename = stripslashes($_FILES['file']['name']);
$extension = getExtension($filename);
$extension = strtolower($extension);
if (($extension != "jpg") && ($extension != "jpeg")
 
&& ($extension != "png") && ($extension != "gif"))
{
echo ' Unknown Image extension ';
$errors=1;
}
else
{
$size=filesize($_FILES['file']['tmp_name']);
 
if ($size > MAX_SIZE*1024)
{
echo "You have exceeded the size limit";
$errors=1;
}
 
if($extension=="jpg" || $extension=="jpeg" )
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
}
else if($extension=="png")
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);
}
else
{
$src = imagecreatefromgif($uploadedfile);
}
 
list($width,$height)=getimagesize($uploadedfile);
 
$newwidth=60;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
 
$newwidth1=25;
$newheight1=($height/$width)*$newwidth1;
$tmp1=imagecreatetruecolor($newwidth1,$newheight1);
 
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,
 
$width,$height);
 
imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,
 
$width,$height);
 
$filename = "images/". $_FILES['file']['name'];
$filename1 = "images/small". $_FILES['file']['name'];
 
imagejpeg($tmp,$filename,100);
imagejpeg($tmp1,$filename1,100);
 
imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}
}
}
//If no errors registred, print the success message
 
if(isset($_POST['Submit']) && !$errors)
{
// mysql_query("update SQL statement ");
echo "Image Uploaded Successfully!";
 
}
?>
 
 

function getExtension($str) {
 
$i = strrpos($str,".");
if (!$i) { return ""; }
 
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}