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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 | 
|---|---|
| 27 |      /** | 
| 28 |       * Allows a plugin to override the WordPress.org Translation Installation API entirely. | 
| 29 |       * | 
| 30 |       * @since 4.0.0 | 
| 31 |       * | 
| 32 |       * @param false|object $result The result object. Default false. | 
| 33 |       * @param string       $type   The type of translations being requested. | 
| 34 |       * @param object       $args   Translation API arguments. | 
| 35 |       */ | 
| 36 |      $res = apply_filters( 'translations_api', false, $type, $args ); | 
| 37 |  | 
| 38 |      if ( false === $res ) { | 
| 39 |           $url      = 'http://api.wordpress.org/translations/' . $type . '/1.0/'; | 
| 40 |           $http_url = $url; | 
| 41 |           $ssl      = wp_http_supports( array( 'ssl' ) ); | 
| 42 |           if ( $ssl ) { | 
| 43 |                $url = set_url_scheme( $url, 'https' ); | 
| 44 |           } | 
| 45 |  |