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.
Parameters
filename
The image being checked.
Return Values
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.
ChangeLog
Version
Description
4.3.2
Support for JPC, JP2,
JPX, JB2,
XBM, and WBMP
4.3.0
Support for SWC
Predefined Constants
The following constants are defined, and represent possible
exif_imagetype() return values:
Table 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
Examples
Example 1. exif_imagetype() example
<?php if (exif_imagetype('image.gif') != IMAGETYPE_GIF) { echo 'The picture is not a gif'; } ?>
