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
|7||IMAGETYPE_TIFF_II (intel byte order)|
|8||IMAGETYPE_TIFF_MM (motorola byte order)|
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.
See also getimagesize().
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