Nastavení IPTC atributů pro obrázky JPEG s využitím setterů

Iptc.php

<?php

class Iptc {
    private $meta;

    const OBJECT_NAME = '2#005';
    const EDIT_STATUS = '2#007';
    const PRIORITY = '2#010';
    const CATEGORY = '2#015';
    const SUPPLEMENTAL_CATEGORY = '2#020';
    const FIXTURE_IDENTIFIER = '2#022';
    const KEYWORDS = '2#025';
    const RELEASE_DATE = '2#030';
    const RELEASE_TIME = '2#035';
    const SPECIAL_INSTRUCTIONS = '2#040';
    const REFERENCE_SERVICE = '2#045';
    const REFERENCE_DATE = '2#047';
    const REFERENCE_NUMBER = '2#050';
    const CREATED_DATE = '2#055';
    const CREATED_TIME = '2#060';
    const ORIGINATING_PROGRAM = '2#065';
    const PROGRAM_VERSION = '2#070';
    const OBJECT_CYCLE = '2#075';
    const BYLINE = '2#080';
    const BYLINE_TITLE = '2#085';
    const CITY = '2#090';
    const PROVINCE_STATE = '2#095';
    const COUNTRY_CODE = '2#100';
    const COUNTRY = '2#101';
    const ORIGINAL_TRANSMISSION_REFERENCE = '2#103';
    const HEADLINE = '2#105';
    const CREDIT = '2#110';
    const SOURCE = '2#115';
    const COPYRIGHT_STRING = '2#116';
    const CAPTION = '2#120';
    const LOCAL_CAPTION = '2#121';

    function __construct(array $info = array()) {
        $this->meta = isset($info["APP13"]) ? iptcparse($info["APP13"]) : array();
    }

    function __set($name, $data) {
        switch ($name) {
            case 'copyright' :
                $this->meta[self::COPYRIGHT_STRING] = array($data);
                return;
            case 'created' :
                $this->meta[self::CREATED_DATE] = array($data->format('Y-m-d'));
                $this->meta[self::CREATED_TIME] = array($data->format('H:i:s'));
                return;
            case 'title' :
                $this->meta[self::HEADLINE] = array($data);
                $this->meta[self::CAPTION] = array($data);
                $this->meta[self::BYLINE_TITLE] = array($data);
                return;
            case 'originating' :
                $this->meta[self::ORIGINATING_PROGRAM] = array($data);
                return;
            case 'keywords' :
                $this->meta[self::KEYWORDS] = array(implode(',', $data));
                return;
        }
        throw new \Exception(__CLASS__ . ": unknown meta '$name'");
    }

    function __get($name) {
        switch ($name) {
            case 'copyright' :
                return $this->meta[self::COPYRIGHT_STRING][0];
            case 'created' :
                return $this->meta[self::CREATED_DATE][0] . ' ' . $this->meta[self::CREATED_TIME][0];
            case 'title' :
                return $this->meta[self::HEADLINE][0];
            case 'originating' :
                return $this->meta[self::ORIGINATING_PROGRAM][0];
            case 'keywords' :
                return $this->meta[self::KEYWORDS][0];
        }
        return '';
    }

    function dump() {
        foreach($this->meta as $key => $value) {
            echo "$key: $value[0]" . PHP_EOL;
        }
    }

    function __toString() {
        $utf8seq = chr(0x1b) . chr(0x25) . chr(0x47); //zapnuti podpory UTF8 v IPCT
        $iptc_new = $this->maketag(1, '090', $utf8seq);
        foreach ($this->meta as $s => $value) {
            $tag = str_replace("2#", "", $s);
            $iptc_new .= $this->maketag(2, $tag, substr($value[0], 0, 128));
        }
        return $iptc_new;
    }

    function maketag($type, $tag, $content) {
        $len = strlen($content);
        $length = (($len < 0x8000) ? "" :
            chr(0x80).chr(0x04) . chr(($len >> 24) & 0xff). chr(($len >> 16) & 0xff)) .
            chr(($len >> 8) & 0xff) . chr(($len) & 0xff);
        return chr(0x1c) . chr($type) . chr((int) $tag) . $length . $content;
    }

    function clean() {
        $this->meta = array();
    }
}

Iptc_test.php

<?php

include "Iptc.php";

$filename = 'mesic.jpg';

$image = imagecreatefromjpeg($oldfilename);
imageinterlace($image, true);
imagejpeg($image, $filename, 80);
getimagesize($filename, $info);

$iptc = new Iptc($info);
$iptc->originating = "PHP";
$iptc->copyright = "MyGoodShop s.r.o., all rights reserved";
$iptc->created = new \DateTime();
$iptc->title = "název produktu na obrázku";
$iptc->keywords = array('key1', 'key2', 'key3');
$mode = 0;
$image = iptcembed((string) $iptc, $filename, $mode);
file_put_contents($filename, $image);