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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 |
---|---|
811 | * Filter the list table sortable columns for a specific screen. |
812 | * |
813 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
814 | * to the ID of the current screen, usually a string. |
815 | * |
816 | * @since 3.5.0 |
817 | * |
818 | * @param array $sortable_columns An array of sortable columns. |
819 | */ |
820 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
821 |
|
822 | $sortable = array(); |
823 | foreach ( $_sortable as $id => $data ) { |
824 | if ( empty( $data ) ) |
825 | continue; |
826 |
|
827 | $data = (array) $data; |
828 | if ( !isset( $data[1] ) ) |
829 | $data[1] = false; |