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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 | 
|---|---|
| 2162 |  * @uses do_action() Calls 'deprecated_file_included' and passes the file name and what to use instead. | 
| 2163 |  * @uses apply_filters() Calls 'deprecated_file_trigger_error' and expects boolean value of true to do trigger or false to not trigger error. | 
| 2164 |  * | 
| 2165 |  * @param string $file The file that was included | 
| 2166 |  * @param string $version The version of WordPress that depreceated the function | 
| 2167 |  * @param string $replacement Optional. The function that should have been called | 
| 2168 |  */ | 
| 2169 | function _deprecated_file($file, $version, $replacement=null) { | 
| 2170 |  | 
| 2171 |      do_action('deprecated_file_included', $file, $replacement); | 
| 2172 |  | 
| 2173 |      // Allow plugin to filter the output error trigger | 
| 2174 |      if( defined('WP_DEBUG') && ( true === WP_DEBUG ) && apply_filters( 'deprecated_file_trigger_error', true )) { | 
| 2175 |           if( !is_null($replacement) ) | 
| 2176 |                trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) ); | 
| 2177 |           else | 
| 2178 |                trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) ); | 
| 2179 |      } | 
| 2180 | } |