Exif 函数
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exif_tagname

(PHP 4 >= 4.2.0, PHP 5)

exif_tagname — Get the header name for an index

说明

string exif_tagname ( int $index )

参数

index

The Tag ID for which a Tag Name will be looked up.

返回值

Returns the header name, or FALSE if index is not a defined EXIF tag id.

范例

Example #1 exif_tagname() example

<?php
echo "256: ".exif_tagname(256).PHP_EOL;
echo "257: ".exif_tagname(257).PHP_EOL;
?>

以上例程会输出：

256: ImageWidth
257: ImageLength

参见

Exif 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Get the header name for an index

用户评论:

abc at ed48 dot com (22-Jun-2011 06:03)

In association with exif_read_data:

<?php

# The tagnames can vary in different cameras

$imgdir = "/path_to_img/";
$img_file = "image_file.jpg";

echo $img_file . "&nbsp;&nbsp;&nbsp;<sub>TEST</sub>
<br />";
echo '<img src="' . $imgdir . $img_file . '" alt="'
 . $img_file . '" title="' . $img_file . '" width="400" /><br /><br />';

$xf_data = exif_read_data($imgdir . $img_file);

$tagg = exif_tagname(0X10F);
echo '<br>' . $tagg .  ' >>> ' . $xf_data[$tagg];
$tagg = exif_tagname(0X110);
echo '<br>' . $tagg .  ' >>> ' . $xf_data[$tagg];
$tagg = exif_tagname(0X132);
echo '<br>' . $tagg .  ' >>> ' . $xf_data[$tagg];
$tagg = exif_tagname(0XA002);
echo '<br>' . $tagg .  ' >>> ' . $xf_data[$tagg] . 'px';
$tagg = exif_tagname(0XA003);
echo '<br>' . $tagg .  ' >>> ' . $xf_data[$tagg] . 'px';

?>

abc at ed48 dot com (21-Jun-2011 09:20)

Theoretically, 65,535 tags are possible. Although not all are used, yet. The code below lists these tags:

<?php

for ($id = 1; $id <= 65535; $id++)
{
$dec2hex = dechex($id);

$strgx = '0x'. $dec2hex;

if(exif_tagname($strgx) != "")
{
echo $strgx . ' ( ' . exif_tagname($strgx) . ' )<br />';
}
}

?>

djmaze@moocms (23-Feb-2008 01:23)

Usage: exif_tagname(0x5001)

A list of all supported index numbers is in the exif.c: tag_table_IFD

http://cvs.php.net/viewvc.cgi/php-src/ext/exif/exif.c?view=markup

As you can see, it doesn't support them all!