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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 |
|---|---|
| 578 | |
| 579 | /** |
| 580 | * Filter the fourth-row list of TinyMCE buttons (Visual tab). |
| 581 | * |
| 582 | * @since 2.5.0 |
| 583 | * |
| 584 | * @param array $buttons Fourth-row list of buttons. |
| 585 | * @param string $editor_id Unique editor identifier, e.g. 'content'. |
| 586 | */ |
| 587 | $mce_buttons_4 = apply_filters( 'mce_buttons_4', array(), $editor_id ); |
| 588 | } |
| 589 | |
| 590 | $body_class = $editor_id; |
| 591 | |
| 592 | if ( $post = get_post() ) { |
| 593 | $body_class .= ' post-type-' . sanitize_html_class( $post->post_type ) . ' post-status-' . sanitize_html_class( $post->post_status ); |
| 594 | if ( post_type_supports( $post->post_type, 'post-formats' ) ) { |
| 595 | $post_format = get_post_format( $post ); |
| 596 | if ( $post_format && ! is_wp_error( $post_format ) ) |