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<?php $letter = 'a'; print_r(array_filter(get_defined_functions()['internal'], function($function) {return $function[0] == $GLOBALS['letter'];}));
Output for git.master, git.master_jit
Array ( [367] => array_push [374] => asort [375] => arsort [390] => array_walk [391] => array_walk_recursive [393] => array_search [396] => array_fill [397] => array_fill_keys [400] => array_pop [401] => array_shift [402] => array_unshift [403] => array_splice [404] => array_slice [405] => array_merge [406] => array_merge_recursive [407] => array_replace [408] => array_replace_recursive [409] => array_keys [410] => array_key_first [411] => array_key_last [412] => array_values [413] => array_count_values [414] => array_column [415] => array_reverse [416] => array_pad [417] => array_flip [418] => array_change_key_case [419] => array_unique [420] => array_intersect_key [421] => array_intersect_ukey [422] => array_intersect [423] => array_uintersect [424] => array_intersect_assoc [425] => array_uintersect_assoc [426] => array_intersect_uassoc [427] => array_uintersect_uassoc [428] => array_diff_key [429] => array_diff_ukey [430] => array_diff [431] => array_udiff [432] => array_diff_assoc [433] => array_diff_uassoc [434] => array_udiff_assoc [435] => array_udiff_uassoc [436] => array_multisort [437] => array_rand [438] => array_sum [439] => array_product [440] => array_reduce [441] => array_filter [442] => array_map [443] => array_key_exists [445] => array_chunk [446] => array_combine [447] => array_is_list [541] => assert [542] => assert_options [586] => addcslashes [587] => addslashes [727] => abs [734] => asin [735] => acos [736] => atan [737] => atanh [738] => atan2 [742] => asinh [743] => acosh )
Output for rfc.property-hooks
Array ( [369] => array_push [376] => asort [377] => arsort [392] => array_walk [393] => array_walk_recursive [395] => array_search [398] => array_fill [399] => array_fill_keys [402] => array_pop [403] => array_shift [404] => array_unshift [405] => array_splice [406] => array_slice [407] => array_merge [408] => array_merge_recursive [409] => array_replace [410] => array_replace_recursive [411] => array_keys [412] => array_key_first [413] => array_key_last [414] => array_values [415] => array_count_values [416] => array_column [417] => array_reverse [418] => array_pad [419] => array_flip [420] => array_change_key_case [421] => array_unique [422] => array_intersect_key [423] => array_intersect_ukey [424] => array_intersect [425] => array_uintersect [426] => array_intersect_assoc [427] => array_uintersect_assoc [428] => array_intersect_uassoc [429] => array_uintersect_uassoc [430] => array_diff_key [431] => array_diff_ukey [432] => array_diff [433] => array_udiff [434] => array_diff_assoc [435] => array_diff_uassoc [436] => array_udiff_assoc [437] => array_udiff_uassoc [438] => array_multisort [439] => array_rand [440] => array_sum [441] => array_product [442] => array_reduce [443] => array_filter [444] => array_map [445] => array_key_exists [447] => array_chunk [448] => array_combine [449] => array_is_list [543] => assert [544] => assert_options [588] => addcslashes [589] => addslashes [729] => abs [736] => asin [737] => acos [738] => atan [739] => atanh [740] => atan2 [744] => asinh [745] => acosh )

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