exif_imagetype
(PHP 4 >= 4.3.0)
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:
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
Note: 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.
Note: This function is only available if PHP is compiled
using --enable-exif.
Note: This function does not require the GD image library.
Example 1. exif_imagetype() example
<?php
if (exif_imagetype("image.gif") != IMAGETYPE_GIF)
{
echo "The picture is not a gif";
}
?>
See also getimagesize().
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