高效Web开发的10个jQuery代码片段
411
2024-02-24
(PHP 4, PHP 5)
iptcembed — 将二进制 IPTC 数据嵌入到一幅 JPEG 图像中
说明
mixed iptcembed ( string$iptcdata
, string $jpeg_file_name
[, int $spool
] )
Embeds binary IPTC data into a JPEG image.
参数
iptcdata
The data to be written.
jpeg_file_name
Path to the JPEG image.
spool
Spool flag. If the spool flag is over 2 then the JPEG will be returned as a string.
返回值
If success and spool flag is lower than 2 then the JPEG will not be
returned as a string, FALSE on errors.
范例
Example #1 Embedding IPTC data into a JPEG
<?php
// iptc_make_tag() function by Thies C. Arntzen
function iptc_make_tag($rec, $data, $value)
{
$length = strlen($value);
$retval = chr(0x1C) . chr($rec) . chr($data);
if($length < 0x8000)
{
$retval .= chr($length >> 8) . chr($length & 0xFF);
}
else
{
$retval .= chr(0x80) .
chr(0x04) .
chr(($length >> 24) & 0xFF) .
chr(($length >> 16) & 0xFF) .
chr(($length >> 8) & 0xFF) .
chr($length & 0xFF);
}
return $retval . $value;
}
// Path to jpeg file
$path = './phplogo.jpg';
// We need to check if theres any IPTC data in the jpeg image. If there is then
// bail out because we cannot embed any image that already has some IPTC data!
$image = getimagesize($path, $info);
if(isset($info['APP13']))
{
die('Error: IPTC data found in source image, cannot continue');
}
// Set the IPTC tags
$iptc = array(
'2#120' => 'Test image',
'2#116' => 'Copyright 2008-2009, The PHP Group'
);
// Convert the IPTC tags into binary code
$data = '';
foreach($iptc as $tag => $string)
{
$tag = substr($tag, 2);
$data .= iptc_make_tag(2, $tag, $string);
}
// Embed the IPTC data
$content = iptcembed($data, $path);
// Write the new image data out to the file.
$fp = fopen($path, "wb");
fwrite($fp, $content);
fclose($fp);
?>
注释
Note:
此函数不需要 GD 图象库。
