PHP method to adjust image size on the server side, _PHP tutorial

php implements the method of resizing images on the server side,

The example in this article describes the method of resizing images on the server side in php. Share it with everyone for your reference. The specific analysis is as follows:

Adjusting the image size on the server side has many advantages over processing it in the browser.
This article describes how PHP resizes images on the server side.

The code consists of two parts:

① imageResizer() is used to process the image
② loadimage() inserts the image url in a simpler format

<&#63;php
 function imageResizer($url, $width, $height) {
  header('Content-type: image/jpeg');
  list($width_orig, $height_orig) = getimagesize($url);
  $ratio_orig = $width_orig/$height_orig;
  if ($width/$height > $ratio_orig) {
   $width = $height*$ratio_orig;
  } else {
   $height = $width/$ratio_orig;
  }
  // This resamples the image
  $image_p = imagecreatetruecolor($width, $height);
  $image = imagecreatefromjpeg($url);
  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
  // Output the image
  imagejpeg($image_p, null, 100);
 }
 //works with both POST and GET
 $method = $_SERVER['REQUEST_METHOD'];
 if ($method == 'GET') {
  imageResize($_GET['url'], $_GET['w'], $_GET['h']);
  } elseif ($method == 'POST') {
  imageResize($_POST['url'], $_POST['w'], $_POST['h']);
  }
 // makes the process simpler
 function loadImage($url, $width, $height){
  echo 'image.php&#63;url=', urlencode($url) ,
  '&w=',$width,
  '&h=',$height;
 }
&#63;>

Usage:

//Above code would be in a file called image.php.
//Images would be displayed like this:
<img src="<&#63;php loadImage('image.jpg', 50, 50) &#63;>" alt="" />

I hope this article will be helpful to everyone’s PHP programming design.

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