exif_imagetype

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:

Tabla 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`

Nota: 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_

Nota: This function is only available if PHP is compiled using __enable_exif_

Nota: This function does not require the GD image library_

Ejemplo 1_ exif_imagetype() example

<?php

if (exif_imagetype("image_gif") != IMAGETYPE_GIF) {
    echo "The picture is not a gif";
}

?>