php使用imagick生成缩略图的方法
<?php
//缩略图
$tmpFile ='$_FILES["file"]["tmp_name"];
$fileName='fileName.jpg';
list($width, $height) = getimagesize($tmpFile);
// resize if necessary
if ($width >= 550 && $height >= 550) {
$image = new Imagick($tmpFile);
$image->thumbnailImage(550, 550,true);
$image->writeImage($fileName);
}
?>
参考：
https://www.sitepoint.com/crop-and-resize-images-with-imagemagick/
http://www.php.net/manual/en/imagick.thumbnailimage.php