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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