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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 |
---|---|
939 | * Filter the list table sortable columns for a specific screen. |
940 | * |
941 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
942 | * to the ID of the current screen, usually a string. |
943 | * |
944 | * @since 3.5.0 |
945 | * |
946 | * @param array $sortable_columns An array of sortable columns. |
947 | */ |
948 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
949 |
|
950 | $sortable = array(); |
951 | foreach ( $_sortable as $id => $data ) { |
952 | if ( empty( $data ) ) |
953 | continue; |
954 |
|
955 | $data = (array) $data; |
956 | if ( !isset( $data[1] ) ) |
957 | $data[1] = false; |