<?php

/**
 * These functions can be replaced via plugins. If plugins do not redefine these
 * functions, then these will be used instead.
 *
 * @package WordPress
 */

if ( ! function_exists( 'wp_set_current_user' ) ) :
/* function wp_set_current_user() – Changes the current user by ID or name. */
endif;

if ( ! function_exists( 'wp_get_current_user' ) ) :
/* function wp_get_current_user() – Retrieve the current user object. */
endif;

if ( ! function_exists( 'get_userdata' ) ) :
/* function get_userdata() – Retrieve user info by user ID. */
endif;

if ( ! function_exists( 'get_user_by' ) ) :
/* function get_user_by() – Retrieves user info by a given field. */
endif;

if ( ! function_exists( 'cache_users' ) ) :
/* function cache_users() – Retrieves info for user lists to prevent multiple queries by get_userdata(). */
endif;

if ( ! function_exists( 'wp_mail' ) ) :
/* function wp_mail() – Sends an email, similar to PHP’s mail function. */
endif;

if ( ! function_exists( 'wp_authenticate' ) ) :
/* function wp_authenticate() – Authenticates a user, confirming the login credentials are valid. */
endif;

if ( ! function_exists( 'wp_logout' ) ) :
/* function wp_logout() – Log the current user out. */
endif;

if ( ! function_exists( 'wp_validate_auth_cookie' ) ) :
/* function wp_validate_auth_cookie() – Validates authentication cookie. */
endif;

if ( ! function_exists( 'wp_generate_auth_cookie' ) ) :
/* function wp_generate_auth_cookie() – Generates authentication cookie contents. */
endif;

if ( ! function_exists( 'wp_parse_auth_cookie' ) ) :
/* function wp_parse_auth_cookie() – Parses a cookie into its components. */
endif;

if ( ! function_exists( 'wp_set_auth_cookie' ) ) :
/* function wp_set_auth_cookie() – Sets the authentication cookies based on user ID. */
endif;

if ( ! function_exists( 'wp_clear_auth_cookie' ) ) :
/* function wp_clear_auth_cookie() – Removes all of the cookies associated with authentication. */
endif;

if ( ! function_exists( 'is_user_logged_in' ) ) :
/* function is_user_logged_in() – Determines whether the current visitor is a logged in user. */
endif;

if ( ! function_exists( 'auth_redirect' ) ) :
/* function auth_redirect() – Checks if a user is logged in, if not it redirects them to the login page. */
endif;

if ( ! function_exists( 'check_admin_referer' ) ) :
/* function check_admin_referer() – Ensures intent by verifying that a user was referred from another admin page with the correct security nonce. */
endif;

if ( ! function_exists( 'check_ajax_referer' ) ) :
/* function check_ajax_referer() – Verifies the Ajax request to prevent processing requests external of the blog. */
endif;

if ( ! function_exists( 'wp_redirect' ) ) :
/* function wp_redirect() – Redirects to another page. */
endif;

if ( ! function_exists( 'wp_sanitize_redirect' ) ) :
/* function wp_sanitize_redirect() – Sanitizes a URL for use in a redirect. */

/* function _wp_sanitize_utf8_in_redirect() – URL encode UTF-8 characters in a URL. */
endif;

if ( ! function_exists( 'wp_safe_redirect' ) ) :
/* function wp_safe_redirect() – Performs a safe (local) redirect, using wp_redirect(). */
endif;

if ( ! function_exists( 'wp_validate_redirect' ) ) :
/* function wp_validate_redirect() – Validates a URL for use in a redirect. */
endif;

if ( ! function_exists( 'wp_notify_postauthor' ) ) :
/* function wp_notify_postauthor() – Notify an author (and/or others) of a comment/trackback/pingback on a post. */
endif;

if ( ! function_exists( 'wp_notify_moderator' ) ) :
/* function wp_notify_moderator() – Notifies the moderator of the site about a new comment that is awaiting approval. */
endif;

if ( ! function_exists( 'wp_password_change_notification' ) ) :
/* function wp_password_change_notification() – Notify the blog admin of a user changing password, normally via email. */
endif;

if ( ! function_exists( 'wp_new_user_notification' ) ) :
/* function wp_new_user_notification() – Emails login credentials to a newly-registered user. */
endif;

if ( ! function_exists( 'wp_nonce_tick' ) ) :
/* function wp_nonce_tick() – Returns the time-dependent variable for nonce creation. */
endif;

if ( ! function_exists( 'wp_verify_nonce' ) ) :
/* function wp_verify_nonce() – Verifies that a correct security nonce was used with time limit. */
endif;

if ( ! function_exists( 'wp_create_nonce' ) ) :
/* function wp_create_nonce() – Creates a cryptographic token tied to a specific action, user, user session,
and window of time. */
endif;

if ( ! function_exists( 'wp_salt' ) ) :
/* function wp_salt() – Returns a salt to add to hashes. */
endif;

if ( ! function_exists( 'wp_hash' ) ) :
/* function wp_hash() – Get hash of given string. */
endif;

if ( ! function_exists( 'wp_hash_password' ) ) :
/* function wp_hash_password() – Create a hash (encrypt) of a plain text password. */
endif;

if ( ! function_exists( 'wp_check_password' ) ) :
/* function wp_check_password() – Checks the plaintext password against the encrypted Password. */
endif;

if ( ! function_exists( 'wp_generate_password' ) ) :
/* function wp_generate_password() – Generates a random password drawn from the defined set of characters. */
endif;

if ( ! function_exists( 'wp_rand' ) ) :
/* function wp_rand() – Generates a random non-negative number. */
endif;

if ( ! function_exists( 'wp_set_password' ) ) :
/* function wp_set_password() – Updates the user’s password with a new encrypted one. */
endif;

if ( ! function_exists( 'get_avatar' ) ) :
/* function get_avatar() – Retrieves the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post. */
endif;

if ( ! function_exists( 'wp_text_diff' ) ) :
/* function wp_text_diff() – Displays a human readable HTML representation of the difference between two strings. */
endif;