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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 |
|---|---|
| 596 | |
| 597 | /** |
| 598 | * Filter the third-row list of TinyMCE buttons (Visual tab). |
| 599 | * |
| 600 | * @since 2.0.0 |
| 601 | * |
| 602 | * @param array $buttons Third-row list of buttons. |
| 603 | * @param string $editor_id Unique editor identifier, e.g. 'content'. |
| 604 | */ |
| 605 | $mce_buttons_3 = apply_filters( 'mce_buttons_3', array(), $editor_id ); |
| 606 | |
| 607 | /** |
| 608 | * Filter the fourth-row list of TinyMCE buttons (Visual tab). |
| 609 | * |
| 610 | * @since 2.5.0 |
| 611 | * |
| 612 | * @param array $buttons Fourth-row list of buttons. |
| 613 | * @param string $editor_id Unique editor identifier, e.g. 'content'. |
| 614 | */ |