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list of the most popular WordPress functions. And it really is so - after all, I assembled here> 150 plug-ins and compared the functions they use with existing wordpress functions. See all the plugins used in the list-of-plugins.txt file.

All functions found at least once, look in the file all-functions-list.txt

So: at the entrance we have WordPress v4.9.1 (623 php file, 330 000 lines of code), the folder plugins and themes are empty.
and I will function from it to compare with the used functions of 152 plug-ins. There are 15423 php files (3 599 426 lines of code, 117 megabytes).

TOP-100 most used WordPress functions in plugins

Function (freq)	Codex	Developers	WP-Kama
__ (57455)	link	link	link
_e (20171)	link	link	link
apply_filters (12700)	-	link	link
add_action (10798)	-	link	link
esc_attr (8064)	-	link	link
get_option (7714)	-	link	link
do_action (6968)	-	link	link
add_filter (5512)	link	link	link
esc_html (4859)	link	link	link
esc_html__ (4803)	link	link	link
esc_html_e (3260)	link	link	link
esc_url (2625)	link	link	link
current_user_can (2610)	link	link	link
update_option (2342)	link	link	link
is_wp_error (2282)	link	link	link
selected (2195)	link	link	link
admin_url (1945)	link	link	link
sanitize_text_field (1931)	-	link	link
wp_enqueue_script (1842)	-	link	link
add_query_arg (1830)	-	link	link
_x (1444)	link	link	link
absint (1402)	link	link	link
get_post_meta (1369)	-	link	link
wp_enqueue_style (1281)	-	link	link
checked (1187)	link	link	link
trailingslashit (1148)	link	link	link
esc_attr_e (1075)	link	link	link
get_current_user_id (1064)	-	link	link
wp_parse_args (1033)	link	link	link
wp_die (1012)	link	link	link
is_multisite (984)	link	link	link
plugins_url (962)	link	link	link
is_user_logged_in (959)	-	link	link
is_admin (909)	link	link	link
delete_option (905)	link	link	link
wp_nonce_field (885)	link	link	link
update_post_meta (874)	link	link	link
get_bloginfo (841)	-	link	link
get_post (836)	-	link	link
esc_attr__ (801)	link	link	link
wp_verify_nonce (773)	link	link	link
wp_redirect (758)	-	link	link
_deprecated_function (737)	-	link	link
get_user_meta (693)	link	link	link
current_time (686)	link	link	link
wp_create_nonce (685)	link	link	link
get_permalink (680)	-	link	link
date_i18n (626)	link	link	link
home_url (626)	link	link	link
_n (616)	link	link	link
update_user_meta (577)	link	link	link
wp_nonce_url (575)	link	link	link
remove_filter (544)	link	link	link
translate (538)	link	link	link
check_admin_referer (524)	link	link	link
wp_register_script (511)	-	link	link
esc_url_raw (485)	link	link	link
add_submenu_page (479)	-	link	link
site_url (474)	link	link	link
get_site_option (467)	link	link	link
esc_sql (453)	link	link	link
wp_localize_script (449)	link	link	link
wp_get_current_user (436)	link	link	link
number_format_i18n (429)	link	link	link
get_user_by (427)	-	link	link
get_current_screen (410)	link	link	link
get_transient (405)	link	link	link
sanitize_title (397)	link	link	link
set_transient (383)	link	link	link
plugin_basename (382)	link	link	link
get_query_var (382)	link	link	link
add_shortcode (377)	link	link	link
wp_kses_post (363)	link	link	link
update_site_option (356)	link	link	link
maybe_unserialize (355)	link	link	link
plugin_dir_path (355)	-	link	link
remove_action (351)	link	link	link
get_posts (346)	link	link	link
wp_kses (341)	link	link	link
plugin_dir_url (340)	link	link	link
esc_js (333)	-	link	link
wp_register_style (326)	link	link	link
get_the_ID (326)	-	link	link
check_ajax_referer (314)	link	link	link
get_plugin_data (312)	link	link	link
register_setting (311)	-	link	link
get_post_type (306)	-	link	link
wp_safe_redirect (306)	link	link	link
get_userdata (305)	link	link	link
get_settings (303) ⚠️ deprecated ⚠️	-	link	link
delete_transient (290)	link	link	link
remove_query_arg (279)	-	link	link
wp_unslash (278)	link	link	link
add_option (277)	link	link	link
is_plugin_active (272)	link	link	link
add_meta_box (268)	-	link	link
wp_upload_dir (265)	-	link	link
wp_cache_get (257)	link	link	link
wp_cache_delete (256)	link	link	link
network_admin_url (256)	link	link	link

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