This function returns the names and values of all the constants currently defined. This includes those created by extensions as well as those created with the define() function.

For example the line below:

 <?php
print_r(get_defined_constants());
?>

will print a list like:

Array (     [E_ERROR] => 1     [E_WARNING] => 2     [E_PARSE] => 4     [E_NOTICE] => 8     [E_CORE_ERROR] => 16     [E_CORE_WARNING] => 32     [E_COMPILE_ERROR] => 64     [E_COMPILE_WARNING] => 128     [E_USER_ERROR] => 256     [E_USER_WARNING] => 512     [E_USER_NOTICE] => 1024     [E_ALL] => 2047     [TRUE] => 1 )

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