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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 |
---|---|
1026 | * Filters the list table sortable columns for a specific screen. |
1027 | * |
1028 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
1029 | * to the ID of the current screen, usually a string. |
1030 | * |
1031 | * @since 3.5.0 |
1032 | * |
1033 | * @param array $sortable_columns An array of sortable columns. |
1034 | */ |
1035 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
1036 |
|
1037 | $sortable = array(); |
1038 | foreach ( $_sortable as $id => $data ) { |
1039 | if ( empty( $data ) ) { |
1040 | continue; |
1041 | } |
1042 |
|
1043 | $data = (array) $data; |
1044 | if ( ! isset( $data[1] ) ) { |