PHP: exif_imagetype

Описание

int exif_imagetype ( string filename )

exif_imagetype() reads the first bytes of an image and checks its signature.

exif_imagetype() can be used to avoid calls to other exif functions with unsupported file types or in conjunction with $_SERVER['HTTP_ACCEPT'] to check whether or not the viewer is able to see a specific image in the browser.

Список параметров

filename: The image being checked.

Возвращаемые значения

When a correct signature is found, the appropriate constant value will be returned otherwise the return value is FALSE. The return value is the same value that getimagesize() returns in index 2 but exif_imagetype() is much faster.

Список изменений

Версия	Описание
4.3.2	Support for JPC, JP2, JPX, JB2, XBM, and WBMP
4.3.0	Support for SWC

Предопределенные константы

The following constants are defined, and represent possible exif_imagetype() return values:

Таблица 1. Imagetype Constants

Value	Constant
1	`IMAGETYPE_GIF`
2	`IMAGETYPE_JPEG`
3	`IMAGETYPE_PNG`
4	`IMAGETYPE_SWF`
5	`IMAGETYPE_PSD`
6	`IMAGETYPE_BMP`
7	`IMAGETYPE_TIFF_II` (intel byte order)
8	`IMAGETYPE_TIFF_MM` (motorola byte order)
9	`IMAGETYPE_JPC`
10	`IMAGETYPE_JP2`
11	`IMAGETYPE_JPX`
12	`IMAGETYPE_JB2`
13	`IMAGETYPE_SWC`
14	`IMAGETYPE_IFF`
15	`IMAGETYPE_WBMP`
16	`IMAGETYPE_XBM`

Примеры

Пример 1. exif_imagetype() example

<?php if (exif_imagetype('image.gif') != IMAGETYPE_GIF) { echo 'The picture is not a gif'; } ?>

Смотрите также

getimagesize()

exif_imagetype

tom at tomvergote dot be
07-Feb-2004 02:11


libexif can also be used to parse image info out of id3 tags:



exif_read_data("mp3_with_2.4ID3TAGS, '', true, false);

tilmauder at yahoo dot com
05-Jul-2003 04:57


After looking for hours, I found a very good source for exif related programs here: http://drewnoakes.com/code/exif/index.html

It lists exif specifications (pdf), a few good links to exif related stuff. The best source I have found in my quest to understand exif better for use in php based exif tools.