php实现在服务器端调整图片大小的方法_PHP教程

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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;

}

?>

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//Above code would be in a file called image.php.

//Images would be displayed like this: