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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 |
|---|---|
| 320 | ob_start(); |
| 321 | |
| 322 | /** |
| 323 | * Fires before the Filter button on the MS sites list table. |
| 324 | * |
| 325 | * @since 5.3.0 |
| 326 | * |
| 327 | * @param string $which The location of the extra table nav markup: 'top' or 'bottom'. |
| 328 | */ |
| 329 | do_action( 'restrict_manage_sites', $which ); |
| 330 | |
| 331 | $output = ob_get_clean(); |
| 332 | |
| 333 | if ( ! empty( $output ) ) { |
| 334 | echo $output; |
| 335 | submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'site-query-submit' ) ); |
| 336 | } |
| 337 | } |
| 338 | ?> |