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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 | 
|---|---|
| 100 |      /** | 
| 101 |       * Filters the Translation Installation API response results. | 
| 102 |       * | 
| 103 |       * @since 4.0.0 | 
| 104 |       * | 
| 105 |       * @param object|WP_Error $res  Response object or WP_Error. | 
| 106 |       * @param string          $type The type of translations being requested. | 
| 107 |       * @param object          $args Translation API arguments. | 
| 108 |       */ | 
| 109 |      return apply_filters( 'translations_api_result', $res, $type, $args ); | 
| 110 | } | 
| 111 |  | 
| 112 | /** | 
| 113 |  * Get available translations from the WordPress.org API. | 
| 114 |  * | 
| 115 |  * @since 4.0.0 | 
| 116 |  * | 
| 117 |  * @see translations_api() | 
| 118 |  * |