php - 使用 PHP GD 嵌入 IPTC 图像数据

Question

我正在尝试使用 iptcembed() 将 IPTC 数据嵌入到 JPEG 图像中但我遇到了一些麻烦。

我已经验证它在最终产品中:

// Embed the IPTC data
$content = iptcembed($data, $path);

// Verify IPTC data is in the end image
$iptc = iptcparse($content);
var_dump($iptc);

返回输入的标签。

但是，当我保存并重新加载图像时，标签不存在:

// Save the edited image
$im = imagecreatefromstring($content);
imagejpeg($im, 'phplogo-edited.jpg');
imagedestroy($im);

// Get data from the saved image
$image = getimagesize('./phplogo-edited.jpg');

// If APP13/IPTC data exists output it
if(isset($image['APP13']))
{
    $iptc = iptcparse($image['APP13']);
    print_r($iptc);
}
else
{
    // Otherwise tell us what the image *does* contain
    // SO: This is what's happening
    print_r($image);
}

那么为什么保存的图像中没有标签？

PHP源是 avaliable here ，相应的输出是:

Image output

Data output

Answer 1

getimagesize有一个可选的第二个参数 Imageinfo其中包含您需要的信息。

从手册:

This optional parameter allows you to extract some extended information from the image file. Currently, this will return the different JPG APP markers as an associative array. Some programs use these APP markers to embed text information in images. A very common one is to embed » IPTC information in the APP13 marker. You can use the iptcparse() function to parse the binary APP13 marker into something readable.

所以你可以像这样使用它:

<?php
$size = getimagesize('./phplogo-edited.jpg', $info);
if(isset($info['APP13']))
{
    $iptc = iptcparse($info['APP13']);
    var_dump($iptc);
}
?>

希望这可以帮助...