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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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1942 | /** |
1943 | * Filters whether the given username exists. |
1944 | * |
1945 | * @since 4.9.0 |
1946 | * |
1947 | * @param int|false $user_id The user ID associated with the username, |
1948 | * or false if the username does not exist. |
1949 | * @param string $username The username to check for existence. |
1950 | */ |
1951 | return apply_filters( 'username_exists', $user_id, $username ); |
1952 | } |
1953 |
|
1954 | /** |
1955 | * Determines whether the given email exists. |
1956 | * |
1957 | * For more information on this and similar theme functions, check out |
1958 | * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ |
1959 | * Conditional Tags} article in the Theme Developer Handbook. |
1960 | * |