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PHP如何在服务器端调整图片大小

在服务器端完成图片大小的调整,会比在浏览器的处理有很多的好处。
本文介绍了PHP如何在服务器端调整图片大小。
代码包括两部分:

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

[cc lang=”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, $height){
echo ‘image.php?url=’, urlencode($url) ,
‘&w=’,$width,
‘&h=’,$height;
}
//调用方法
//Above code would be in a file called image.php.
//Images would be displayed like this:
<img src=”<?php loadImage(‘image.jpg’, 50, 50) ?>” alt=”” />
[/cc]

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