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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 |
|---|---|
| 43 | $taxonomy = $args['taxonomy']; |
| 44 | /** |
| 45 | * Filter the taxonomy used to retrieve terms when calling get_categories(). |
| 46 | * |
| 47 | * @since 2.7.0 |
| 48 | * |
| 49 | * @param string $taxonomy Taxonomy to retrieve terms from. |
| 50 | * @param array $args An array of arguments. @see get_terms() |
| 51 | */ |
| 52 | $taxonomy = apply_filters( 'get_categories_taxonomy', $taxonomy, $args ); |
| 53 | |
| 54 | // Back compat |
| 55 | if ( isset($args['type']) && 'link' == $args['type'] ) { |
| 56 | _deprecated_argument( __FUNCTION__, '3.0', '' ); |
| 57 | $taxonomy = $args['taxonomy'] = 'link_category'; |
| 58 | } |
| 59 | |
| 60 | $categories = (array) get_terms( $taxonomy, $args ); |
| 61 | |