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# exif_imagetype

(PHP 4 CVS only)

exif_imagetype -- Determine the type of an image

## Description

int|false 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: 1 = IMAGETYPE_GIF, 2 = IMAGETYPE_JPG, 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_SWC.

This function can be used to avoid calls to other exif functions with unsupported file teypes or in conjunction with $_SERVER['HTTP_ACCEPT'] to check whether or not the viewer is able to see a specific image in his browser.

> Note: This function is only available in PHP 4 compiled using `--enable-exif`.

> This function does not require the GD image library.

> See also getimagesize().

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Image functions | Up | exif_read_data