exif_imagetype

exif_imagetype

(PHP 4 >= 4.3.0, PHP 5)

exif_imagetype -- Determine the type of an image

Description

int exif_imagetype ( string filename)

exif_imagetype() reads the first bytes of an image and checks its signature. When a correct signature is found a constant will be returned otherwise the return value is FALSE. The return value is the same value that getimagesize() returns in index 2 but this function is much faster.

The following constants are defined:

표 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

참고: Support for JPC, JP2, JPX, JB2, XBM, and WBMP became available in PHP 4.3.2. Support for SWC as of PHP 4.3.0.

This function 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.

참고: This function is only available if PHP is compiled using --enable-exif.

참고: This function does not require the GD image library.

예 1. exif_imagetype() example <?php if (exif_imagetype("image.gif") != IMAGETYPE_GIF) {    echo "The picture is not a gif"; } ?>

See also getimagesize().

add a note User Contributed Notes
exif_imagetype

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

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
06-Jul-2003 08:57

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.