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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 |
|---|---|
| 166 | * Filter the taxonomy terms checklist arguments. |
| 167 | * |
| 168 | * @since 3.4.0 |
| 169 | * |
| 170 | * @see wp_terms_checklist() |
| 171 | * |
| 172 | * @param array $args An array of arguments. |
| 173 | * @param int $post_id The post ID. |
| 174 | */ |
| 175 | $params = apply_filters( 'wp_terms_checklist_args', $args, $post_id ); |
| 176 | |
| 177 | $r = wp_parse_args( $params, $defaults ); |
| 178 | |
| 179 | if ( empty( $r['walker'] ) || ! is_a( $r['walker'], 'Walker' ) ) { |
| 180 | $walker = new Walker_Category_Checklist; |
| 181 | } else { |
| 182 | $walker = $r['walker']; |
| 183 | } |
| 184 | |