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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 |
---|---|
2782 | /** |
2783 | * Filters reserved site names on a sub-directory Multisite installation. |
2784 | * |
2785 | * @since 3.0.0 |
2786 | * @since 4.4.0 'wp-admin', 'wp-content', 'wp-includes', 'wp-json', and 'embed' were added |
2787 | * to the reserved names list. |
2788 | * |
2789 | * @param string[] $subdirectory_reserved_names Array of reserved names. |
2790 | */ |
2791 | return apply_filters( 'subdirectory_reserved_names', $names ); |
2792 | } |
2793 |
|
2794 | /** |
2795 | * Sends a confirmation request email when a change of network admin email address is attempted. |
2796 | * |
2797 | * The new network admin address will not become active until confirmed. |
2798 | * |
2799 | * @since 4.9.0 |
2800 | * |