PHP method to adjust image size on the server side_PHP tutorial

How to adjust the image size on the server side in PHP

This article describes the method of adjusting the image size 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

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

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, $height){ echo 'image.php?url=', urlencode($url) , '&w=',$width, '&h=',$height; } ?>

1 2

3

4

5

6

1 2 3

//Above code would be in a file called image.php. //Images would be displayed like this:

7 8

9 10

11 12 13 14 15 16 17

18

19

20 21 22 23 24 25 26 27 28 29 30 31

<🎜>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, $height){ echo 'image.php?url=', urlencode($url) , '&w=',$width, '&h=',$height; } ?>

Usage: ?

1 2 3

//Above code would be in a file called image.php. //Images would be displayed like this:

I hope this article will be helpful to everyone’s PHP programming design. http://www.bkjia.com/PHPjc/1017136.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1017136.htmlTechArticleHow to adjust the image size on the server side using php. This article describes how to adjust the image size on the server side using php. . Share it with everyone for your reference. The specific analysis is as follows:...