本文實例講述了php實現在服務器端調整圖片大小的方法。分享給大家供大家參考。具體分析如下：
在服務器端完成圖片大小的調整，會比在浏覽器的處理有很多的好處。
本文介紹了PHP如何在服務器端調整圖片大小。
代碼包括兩部分：
① imageResizer() is used to process the image
② loadimage() inserts the image url in a simpler format
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<?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：
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//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="" />
希望本文所述對大家的php程序設計有所幫助。
