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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 |
|---|---|
| 93 | * Filters the taxonomy terms checklist arguments. |
| 94 | * |
| 95 | * @since 3.4.0 |
| 96 | * |
| 97 | * @see wp_terms_checklist() |
| 98 | * |
| 99 | * @param array|string $args An array or string of arguments. |
| 100 | * @param int $post_id The post ID. |
| 101 | */ |
| 102 | $params = apply_filters( 'wp_terms_checklist_args', $args, $post_id ); |
| 103 | |
| 104 | $parsed_args = wp_parse_args( $params, $defaults ); |
| 105 | |
| 106 | if ( empty( $parsed_args['walker'] ) || ! ( $parsed_args['walker'] instanceof Walker ) ) { |
| 107 | $walker = new Walker_Category_Checklist(); |
| 108 | } else { |
| 109 | $walker = $parsed_args['walker']; |
| 110 | } |
| 111 | |