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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
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1927 | /** |
1928 | * Filters whether the given username exists. |
1929 | * |
1930 | * @since 4.9.0 |
1931 | * |
1932 | * @param int|false $user_id The user ID associated with the username, |
1933 | * or false if the username does not exist. |
1934 | * @param string $username The username to check for existence. |
1935 | */ |
1936 | return apply_filters( 'username_exists', $user_id, $username ); |
1937 | } |
1938 |
|
1939 | /** |
1940 | * Determines whether the given email exists. |
1941 | * |
1942 | * For more information on this and similar theme functions, check out |
1943 | * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ |
1944 | * Conditional Tags} article in the Theme Developer Handbook. |
1945 | * |