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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 |
|---|---|
| 443 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
| 444 | * to the ID of the current screen, usually a string. |
| 445 | * |
| 446 | * This filter can currently only be used to remove bulk actions. |
| 447 | * |
| 448 | * @since 3.5.0 |
| 449 | * |
| 450 | * @param array $actions An array of the available bulk actions. |
| 451 | */ |
| 452 | $this->_actions = apply_filters( "bulk_actions-{$this->screen->id}", $this->_actions ); |
| 453 | $two = ''; |
| 454 | } else { |
| 455 | $two = '2'; |
| 456 | } |
| 457 | |
| 458 | if ( empty( $this->_actions ) ) |
| 459 | return; |
| 460 | |
| 461 | echo '<label for="bulk-action-selector-' . esc_attr( $which ) . '" class="screen-reader-text">' . __( 'Select bulk action' ) . '</label>'; |