我修改了一个我发现here的课(感谢debers).

并且所有对IPTC标签的引用都可以从@L_304_31@中读取

现在的代码(PHP> = 5.4)：

<?
define("IPTC_OBJECT_NamE","005");
define("IPTC_EDIT_statUS","007");
define("IPTC_PRIORITY","010");
define("IPTC_CATEGORY","015");
define("IPTC_SUPPLEMENTAL_CATEGORY","020");
define("IPTC_FIXTURE_IDENTIFIER","022");
define("IPTC_KEYWOrds","025");
define("IPTC_RELEASE_DATE","030");
define("IPTC_RELEASE_TIME","035");
define("IPTC_SPECIAL_INSTRUCTIONS","040");
define("IPTC_REFERENCE_SERVICE","045");
define("IPTC_REFERENCE_DATE","047");
define("IPTC_REFERENCE_NUMBER","050");
define("IPTC_CREATED_DATE","055");
define("IPTC_CREATED_TIME","060");
define("IPTC_ORIginATING_PROGRAM","065");
define("IPTC_PROGRAM_VERSION","070");
define("IPTC_OBJECT_CYCLE","075");
define("IPTC_BYLINE","080");
define("IPTC_BYLINE_TITLE","085");
define("IPTC_CITY","090");
define("IPTC_PROVINCE_STATE","095");
define("IPTC_COUNTRY_CODE","100");
define("IPTC_COUNTRY","101");
define("IPTC_ORIGINAL_TRANSMISSION_REFERENCE","103");
define("IPTC_HEADLINE","105");
define("IPTC_CredIT","110");
define("IPTC_SOURCE","115");
define("IPTC_COPYRIGHT_STRING","116");
define("IPTC_CAPTION","120");
define("IPTC_LOCAL_CAPTION","121");

class IPTC
{
    VAR $Meta = [];
    var $file = null;

    function __construct($filename)
    {
        $info = null;

        $size = getimagesize($filename,$info);

        if(isset($info["APP13"])) $this->Meta = iptcparse($info["APP13"]);

        $this->file = $filename;
    }

    function getValue($tag)
    {
        return isset($this->Meta["2#$tag"]) ? $this->Meta["2#$tag"][0] : "";
    }

    function setValue($tag,$data)
    {
        $this->Meta["2#$tag"] = [$data];

        $this->write();
    }

    private function write()
    {
        $mode = 0;

        $content = iptcembed($this->binary(),$this->file,$mode);   

        $filename = $this->file;

        if(file_exists($this->file)) unlink($this->file);

        $fp = fopen($this->file,"w");
        fwrite($fp,$content);
        fclose($fp);
    }         

    private function binary()
    {
        $data = "";

        foreach(array_keys($this->Meta) as $key)
        {
            $tag = str_replace("2#","",$key);
            $data .= $this->iptc_maketag(2,$tag,$this->Meta[$key][0]);
        }       

        return $data;
    }

    function iptc_maketag($rec,$value)
    {
        $length = strlen($value);
        $retval = chr(0x1C) . chr($rec) . chr($data);

        if($length < 0x8000)
        {
            $retval .= chr($length >> 8) .  chr($length &amp; 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;            
    }   

    function dump()
    {
        echo "<pre>";
        print_r($this->Meta);
        echo "</pre>";
    }

    #requires GD library installed
    function removeAllTags()
    {
        $this->Meta = [];
        $img = imagecreatefromstring(implode(file($this->file)));
        if(file_exists($this->file)) unlink($this->file);
        imagejpeg($img,100);
    }
}

$file = "photo.jpg";
$objIPTC = new IPTC($file);

//set title
$objIPTC->setValue(IPTC_HEADLINE,"A title for this picture");

//set description
$objIPTC->setValue(IPTC_CAPTION,"Some words describing what can be seen in this picture.");

echo $objIPTC->getValue(IPTC_HEADLINE);
?>