从 url 创建缩略图？

Question

我正在尝试使用此功能从亚马逊 s3 的外部 URL 创建缩略图。

function resizeImage($originalImage,$toWidth,$toHeight){

    // Get the original geometry and calculate scales
    list($width, $height) = file_get_contents($originalImage);
    $xscale=$width/$toWidth;
    $yscale=$height/$toHeight;

    // Recalculate new size with default ratio
    if ($yscale>$xscale){
        $new_width = round($width * (1/$yscale));
        $new_height = round($height * (1/$yscale));
    }
    else {
        $new_width = round($width * (1/$xscale));
        $new_height = round($height * (1/$xscale));
    }

    // Resize the original image
    $imageResized = imagecreatetruecolor($new_width, $new_height);
    $imageTmp     = imagecreatefromjpeg ($originalImage);
    imagecopyresampled($imageResized, $imageTmp, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

    return $imageResized;
}

我遇到的问题是它似乎只适用于相对网址我收到以下错误。

Warning: Division by zero in /home/isd/public_html/swfupload/resize.php on line 15

Warning: Division by zero in /home/isd/public_html/swfupload/resize.php on line 16

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /home/isd/public_html/swfupload/resize.php on line 20

Warning: imagecreatefromjpeg(Chrysanthemum.jpg) [function.imagecreatefromjpeg]: failed to open stream: No such file or directory in /home/isd/public_html/swfupload/resize.php on line 21

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/isd/public_html/swfupload/resize.php on line 22

Warning: Division by zero in /home/isd/public_html/swfupload/resize.php on line 15

Warning: Division by zero in /home/isd/public_html/swfupload/resize.php on line 16

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /home/isd/public_html/swfupload/resize.php on line 20

Warning: imagecreatefromjpeg(Desert.jpg) [function.imagecreatefromjpeg]: failed to open stream: No such file or directory in /home/isd/public_html/swfupload/resize.php on line 21

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/isd/public_html/swfupload/resize.php on line 22

Warning: file_get_contents(http://isdprogress.s3.amazonaws.com/HQ preview.jpg) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.1 505 HTTP Version Not Supported in /home/isd/public_html/swfupload/resize.php on line 5

现在有人可以使用一种好方法或功能来将图像大小调整为外部网址的缩略图吗？？？

谢谢

Answer 1

file_get_contents 不返回图像资源的宽度或高度。

它将文件的内容返回到字符串中： http:// hu2.php.net/manual/en/function.file-get-contents.php

使用 imagesx 和 imagesy 代替：

http://hu2.php.net/manual/en/function.imagesx.php

http://hu2.php.net/manual/en/function.imagesy.php

添加：

我不知道你的过程，但我认为你只是使用 file_get_contents 将图像检索为字符串，这不是有效的图像资源。

因此，您必须将这些数据转换为图像资源。使用 imagecreatefromstring 函数： http://hu2.php.net/manual/en/function .imagecreatefromstring.php

免责声明：我没有看到您的完整代码，所以这只是猜测您没有图像资源:)

Answer 2

好的

终于让它在这个伟大的解决方案中工作 http://joedesigns.com/v22/ ?page=scripts_widgets&id=67

好好享受一下；)