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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 |
---|---|
1121 | * Filters the list table sortable columns for a specific screen. |
1122 | * |
1123 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
1124 | * to the ID of the current screen. |
1125 | * |
1126 | * @since 3.1.0 |
1127 | * |
1128 | * @param array $sortable_columns An array of sortable columns. |
1129 | */ |
1130 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
1131 |
|
1132 | $sortable = array(); |
1133 | foreach ( $_sortable as $id => $data ) { |
1134 | if ( empty( $data ) ) { |
1135 | continue; |
1136 | } |
1137 |
|
1138 | $data = (array) $data; |
1139 | if ( ! isset( $data[1] ) ) { |