本文实例讲述了php实现在服务器端调整图片大小的方法。分享给大家供大家参考。具体分析如下：
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：
① imageresizer() is used to process the image
② loadimage() inserts the image url in a simpler format
<?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;
}
?>
用法：
//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="" />
希望本文所述对大家的php程序设计有所帮助。
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