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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 |
---|---|
775 | * Filter the list table sortable columns for a specific screen. |
776 | * |
777 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
778 | * to the ID of the current screen, usually a string. |
779 | * |
780 | * @since 3.5.0 |
781 | * |
782 | * @param array $sortable_columns An array of sortable columns. |
783 | */ |
784 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
785 |
|
786 | $sortable = array(); |
787 | foreach ( $_sortable as $id => $data ) { |
788 | if ( empty( $data ) ) |
789 | continue; |
790 |
|
791 | $data = (array) $data; |
792 | if ( !isset( $data[1] ) ) |
793 | $data[1] = false; |