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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 |
---|---|
325 | ob_start(); |
326 |
|
327 | /** |
328 | * Fires before the Filter button on the MS sites list table. |
329 | * |
330 | * @since 5.3.0 |
331 | * |
332 | * @param string $which The location of the extra table nav markup: 'top' or 'bottom'. |
333 | */ |
334 | do_action( 'restrict_manage_sites', $which ); |
335 | $output = ob_get_clean(); |
336 | if ( ! empty( $output ) ) { |
337 | echo $output; |
338 | submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'site-query-submit' ) ); |
339 | } |
340 | } |
341 | ?> |
342 | </div> |
343 | <?php |