PHP：满足条件时改变图像质量？

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我有一个PHP脚本,用户可以上传图像.
如果文件大小大于’X’kbytes,我想让脚本降低图像质量(jpeg).

像这样的东西：

if( $_FILES['uploaded_img']['size'] > $file_size_limit ){
     // code that lowers the quality of the uploaded image but keeps the image width and height
}

对此最好的方法是什么？

ps：我不想改变图像的宽度和高度.

解决方法:

你当然可以.做这样的事情.

$upload = $_FILES['uploaded_img'];
$uploadPath = 'new/path/for/upload/';
$uploadName = pathinfo($upload['name'], PATHINFO_FILENAME);
$restrainedQuality = 75; //0 = lowest, 100 = highest. ~75 = default
$sizeLimit = 2000;

if($upload['size'] > $sizeLimit) {
    //open a stream for the uploaded image
    $streamHandle = @fopen($upload['tmp_name'], 'r');
    //create a image resource from the contents of the uploaded image
    $resource = imagecreatefromstring(stream_get_contents($streamHandle));

    if(!$resource)
        die('Something wrong with the upload!');

    //close our file stream
    @fclose($streamHandle);

    //move the uploaded file with a lesser quality
    imagejpeg($resource, $uploadPath . $uploadName . '.jpg', $restrainedQuality); 
    //delete the temporary upload
    @unlink($upload['tmp_name']);
} else {
    //the file size is less than the limit, just move the temp file into its appropriate directory
    move_uploaded_file($upload['tmp_name'], $uploadPath . $upload['name']);
}

这将接受PHP GD支持的任何图像格式(假设它已安装在您的服务器上.很可能是).如果图像小于限制,它只会将原始图像上传到您指定的路径.

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