用cURL输出外部图像，但是如何改变图像的宽度呢？

发布于 2024-10-18 10:41:26 字数 388 浏览 1 评论 0原文

header('Content-type: image/jpeg');

$url = $_GET['url']; 

$ch = curl_init(); 

curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1); 

$file = curl_exec($ch); 

curl_close($ch);

echo $file;

谁能告诉我如何将 $file 的宽度更改为 300px？

原文

header('Content-type: image/jpeg');

$url = $_GET['url']; 

$ch = curl_init(); 

curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1); 

$file = curl_exec($ch); 

curl_close($ch);

echo $file;

Can anyone please tell me how I can change the width of $file to 300px?

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圈圈圆圆圈圈 2024-10-25 10:41:26

如果图像在标签内发送给浏览器，那么您可以通过更改 width 属性让浏览器重新缩放它。

否则，您需要抓取该文件并在输出之前在 PHP 代码中重新缩放它。

您可以使用 imagecopyresampled() 来执行此操作，计算高度。然后输出结果。

例如，从上面的代码将图像获取到 $file 中。

$img = @imagecreatefromstring($file);

if ($img === false) {
    echo $file;
    exit;
}

$width = imagesx($img);
$height = imagesy($img);

$newWidth = 300;

$ratio = $newWidth / $width;
$newHeight = $ratio * $height;


$resized = @imagecreatetruecolor($newWidth, $newHeight);

if ($resized === false) {
    echo $file;
    exit;
}

$quality = 90;

if (@imagecopyresampled($resized, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height)) {
    @imagejpeg($resized, NULL, $quality);
} else {
    echo $file;
}

If the image is heading for a browser inside an <img> tag, then you can get the browser to rescale it by changing the width attribute.

Otherwise you need to grab the file and rescale it in your PHP code before outputting it.

You can use imagecopyresampled() to do that, calculating the height. Then outputting the result.

Example, following on from obtaining the image in to $file from the code above.

$img = @imagecreatefromstring($file);

if ($img === false) {
    echo $file;
    exit;
}

$width = imagesx($img);
$height = imagesy($img);

$newWidth = 300;

$ratio = $newWidth / $width;
$newHeight = $ratio * $height;


$resized = @imagecreatetruecolor($newWidth, $newHeight);

if ($resized === false) {
    echo $file;
    exit;
}

$quality = 90;

if (@imagecopyresampled($resized, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height)) {
    @imagejpeg($resized, NULL, $quality);
} else {
    echo $file;
}

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