iptcembed

(PHP 4, PHP 5)

iptcembed — Embeds binary IPTC data into a JPEG image

Descrizione

mixed iptcembed ( string $iptcdata , string $jpeg_file_name [, int $spool ] )

Embeds binary IPTC data into a JPEG image.

Elenco dei parametri

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.

Valori restituiti

If success and spool flag is lower than 2 then the JPEG will not be returned as a string, FALSE on errors.

Esempi

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);
?>

Note

Nota:
Questa funzione non necessita della libreria grafica GD.