imagetypes
    (PHP 3 CVS only, PHP 4 >= 4.0.2, PHP 5)
imagetypes -- Return the image types supported by this PHP build
Description
int 
imagetypes ( void  )
     This function returns a bit-field corresponding to the image
     formats supported by the version of GD linked into PHP.  The
     following bits are returned, IMG_GIF | IMG_JPG 
     | IMG_PNG | IMG_WBMP | IMG_XPM.
     To check for PNG support, for example, do this:
     
Example 1. imagetypes() example 
<?php if (imagetypes() & IMG_PNG) {     echo "PNG Support is enabled"; } ?>
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