PHP: exif_imagetype function - 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.

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:

**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';
}
?>