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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 |
|---|---|
| 55 | |
| 56 | /** |
| 57 | * Filters whether to enable the subdirectory installation feature in Multisite. |
| 58 | * |
| 59 | * @since 3.0.0 |
| 60 | * |
| 61 | * @param bool $allow Whether to enable the subdirectory installation feature in Multisite. |
| 62 | * Default false. |
| 63 | */ |
| 64 | if ( apply_filters( 'allow_subdirectory_install', false ) ) { |
| 65 | return true; |
| 66 | } |
| 67 | |
| 68 | if ( defined( 'ALLOW_SUBDIRECTORY_INSTALL' ) && ALLOW_SUBDIRECTORY_INSTALL ) { |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | $post = $wpdb->get_row( "SELECT ID FROM $wpdb->posts WHERE post_date < DATE_SUB(NOW(), INTERVAL 1 MONTH) AND post_status = 'publish'" ); |
| 73 | if ( empty( $post ) ) { |