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:
Table 1. Imagetype Constants
ValueConstant1 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_XBMNote: 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().
