PHP Manual
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(PHP 4, PHP 5)
This function returns the names of all the functions defined in the module indicated by module_name.
Note: The module_name parameter must be in lowercase.
For example the lines below
<?phpprint_r(get_extension_funcs("xml"));print_r(get_extension_funcs("gd"));?>
will print a list of the functions in the modules xml and gd respectively.
See also: get_loaded_extensions()