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<?php $f = get_defined_functions(); $funcs = $f['internal']; print_r(array_slice($funcs, 0, 20));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => zend_version [1] => func_num_args [2] => func_get_arg [3] => func_get_args [4] => strlen [5] => strcmp [6] => strncmp [7] => strcasecmp [8] => strncasecmp [9] => error_reporting [10] => define [11] => defined [12] => get_class [13] => get_called_class [14] => get_parent_class [15] => is_subclass_of [16] => is_a [17] => get_class_vars [18] => get_object_vars [19] => get_mangled_object_vars )

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