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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 |
|---|---|
| 999 | /** |
| 1000 | * Filter whether to show the Screen Options submit button. |
| 1001 | * |
| 1002 | * @since 4.4.0 |
| 1003 | * |
| 1004 | * @param bool $show_button Whether to show Screen Options submit button. |
| 1005 | * Default false. |
| 1006 | * @param WP_Screen $this Current WP_Screen instance. |
| 1007 | */ |
| 1008 | $show_button = apply_filters( 'screen_options_show_submit', false, $this ); |
| 1009 | |
| 1010 | if ( $show_button ) { |
| 1011 | submit_button( __( 'Apply' ), 'primary', 'screen-options-apply', true ); |
| 1012 | } |
| 1013 | |
| 1014 | echo $form_end . $wrapper_end; |
| 1015 | } |
| 1016 | |
| 1017 | /** |