如何在 PHP 中创建图像并 header？

Question

我在 PHP 创建图像时遇到了一个问题。我的以下代码有什么问题？

<?php
$filename = 'play';
$img = "http://www.slcentral.com/ipod-mp3-player/5.JPG";


$image = imagecreatefromjpeg($img);
$cleft = 0;
$ctop = 45;
$canvas = imagecreatetruecolor(480, 270);
imagecopy($canvas, $image, 0, 0, $cleft, $ctop, 480, 360);
$image = $canvas;

$imageWidth = imagesx($image);
$imageHeight = imagesy($image);

// ADD THE PLAY ICON
$play_icon = "f-play.png";
$logoImage = imagecreatefrompng($play_icon);
imagealphablending($logoImage, TRUE);
$logoWidth = imagesx($logoImage);
$logoHeight = imagesy($logoImage);

// CENTER PLAY ICON
$left = round($imageWidth / 2) - round($logoWidth / 2);
$top = round($imageHeight / 2) - round($logoHeight / 2);

// CONVERT TO PNG SO WE CAN GET THAT PLAY BUTTON ON THERE
imagecopy( $image, $logoImage, $left, $top, 0, 0, $logoWidth, $logoHeight);
imagepng( $image, $filename .".png", 9);
// MASHUP FINAL IMAGE AS A JPEG
$input = imagecreatefrompng($filename .".png");
$output = imagecreatetruecolor($imageWidth, $imageHeight);
$white = imagecolorallocate($output, 255, 255, 255);
imagefilledrectangle($output, 0, 0, $imageWidth, $imageHeight, $white);
imagecopy($output, $input, 0, 0, 0, 0, $imageWidth, $imageHeight);

// OUTPUT TO 'i' FOLDER
header("Content-type: image/jpeg");
imagejpeg($output, $filename . ".jpg", 95);
// UNLINK PNG VERSION
@unlink($filename .".png");
die();
?>

以上代码是通过给定 url 创建一个图像并向其添加播放图标。我想访问 http://coolrss.com/create-img.php 它会显示带有播放图标的图像。

请帮忙！

Answer 1

确保路径具有正确的权限，否则您将得到：

PHP Warning: imagepng(): Unable to open 'play.png' for writing: Permission denied in /var/www/coolrss/public_html/create-img.php on line 32
确保你已经安装了GD。
使用此 header 开始您的代码（在 php 标记 (<?php) 之后）

header("Content-Type: image/jpeg");
最后（最后一行）添加

imagejpeg($output, NULL, 100);

您的代码现在看起来像这样：

<?php
header("Content-Type: image/jpeg");
$filename = 'play';
$img = "http://www.slcentral.com/ipod-mp3-player/5.JPG";


$image = imagecreatefromjpeg($img);
$cleft = 0;
$ctop = 45;
$canvas = imagecreatetruecolor(480, 270);
imagecopy($canvas, $image, 0, 0, $cleft, $ctop, 480, 360);
$image = $canvas;

$imageWidth = imagesx($image);
$imageHeight = imagesy($image);

// ADD THE PLAY ICON
$play_icon = "f-play.png";
$logoImage = imagecreatefrompng($play_icon);
imagealphablending($logoImage, TRUE);
$logoWidth = imagesx($logoImage);
$logoHeight = imagesy($logoImage);

// CENTER PLAY ICON
$left = round($imageWidth / 2) - round($logoWidth / 2);
$top = round($imageHeight / 2) - round($logoHeight / 2);

// CONVERT TO PNG SO WE CAN GET THAT PLAY BUTTON ON THERE
imagecopy( $image, $logoImage, $left, $top, 0, 0, $logoWidth, $logoHeight);
imagepng( $image, $filename .".png", 9);
// MASHUP FINAL IMAGE AS A JPEG
$input = imagecreatefrompng($filename .".png");
$output = imagecreatetruecolor($imageWidth, $imageHeight);
$white = imagecolorallocate($output, 255, 255, 255);
imagefilledrectangle($output, 0, 0, $imageWidth, $imageHeight, $white);
imagecopy($output, $input, 0, 0, 0, 0, $imageWidth, $imageHeight);
imagejpeg($output, NULL, 100);

屏幕截图 - 适合我

如何在 PHP 中创建图像并 header？

how to create image and header it in PHP?

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