Friday, 7 June 2013

how to upload and resize image for thumbnail in php

06:02  softe9gineer  2 comments

           

This tutorial tell you how to upload and resize image for thumbnail in php.

Just copy the code bellow and save it as "resize_image.php" then open it in your server e.g. localhost.
<?php
if($_SERVER["REQUEST_METHOD"] == "POST")
 {
 // By using the global PHP $_FILES array you can upload files from a client computer to the remote server.
 $image = $_FILES["file"]["name"];
 //get the name of the temporary copy of the file stored on the server.
 $uploadedfile = $_FILES['file']['tmp_name'];
 //get the type of the uploaded file.
 $image_type =$_FILES["file"]["type"];
 //imagecreatefrompng — Create a new image from file or URL because we are not sure user inputed file is png or with an other extention therefore we will use if else condition.
 if($image_type=='image/png' || $image_type=='image/x-png')
 {
  $src = imagecreatefrompng($uploadedfile);
 }
 elseif($image_type=='image/gif')
 {
  $src = imagecreatefromgif($uploadedfile);
 }
 elseif($image_type=='image/jpeg' || $image_type=='image/jpg' || $image_type == 'image/pjpeg')
 {
  $src = imagecreatefromjpeg($uploadedfile);
 }
 //getimagesize() this function — Get the size of an image which user inputed. we need orignal size for resizing the image in "imagecopyresampled" function.
 list($width,$height)=getimagesize($uploadedfile);
 //We have get orignal height and width by using list($width,$height)=getimagesize($uploadedfile);
 //Now set your own width and height which you want.
 $new_width=100;
 $new_height=100;
 // Bellow function Create a new true color image so that quality of your image don't change.
 $image_p=imagecreatetruecolor($new_width,$new_height);

 // Turn off alpha blending and set alpha flag // otherwise png's images background color will be black.
    imagealphablending($image_p, false);
    imagesavealpha($image_p, true);
 //Fucntion bellow will resize image
 imagecopyresampled($image_p,$src,0,0,0,0,$new_width,$new_height,$width,$height);

 $filename = "images/". $_FILES['file']['name'];

 if(move_uploaded_file($_FILES["file"]["tmp_name"], $filename))
 {
  if($image_type=='image/png' || $image_type=='image/x-png')
   imagepng($image_p,$filename,9) ;
  else
   imagejpeg($image_p,$filename,100);
  echo 'Image uploaded';
  imagedestroy($image_p);
  //file has uploaded successfully, store its name in data base. see this link http://b2atutorials.blogspot.com/2012/05/upload-image-into-folder-and-save-its.html
 }
 }
?>
<html>
<body>
    <form method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="submit">
    </form>
</body>
</html>
    

 

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