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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 | 
|---|---|
| 57 |           if ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chromeframe' ) !== false ) { | 
| 58 |                $is_admin = is_admin(); | 
| 59 |                /** | 
| 60 |                 * Filter whether Google Chrome Frame should be used, if available. | 
| 61 |                 * | 
| 62 |                 * @since 3.2.0 | 
| 63 |                 * | 
| 64 |                 * @param bool $is_admin Whether to use the Google Chrome Frame. Default is the value of is_admin(). | 
| 65 |                 */ | 
| 66 |                if ( $is_chrome = apply_filters( 'use_google_chrome_frame', $is_admin ) ) | 
| 67 |                     header( 'X-UA-Compatible: chrome=1' ); | 
| 68 |                $is_winIE = ! $is_chrome; | 
| 69 |           } else { | 
| 70 |                $is_chrome = true; | 
| 71 |           } | 
| 72 |      } elseif ( stripos($_SERVER['HTTP_USER_AGENT'], 'safari') !== false ) { | 
| 73 |           $is_safari = true; | 
| 74 |      } elseif ( ( strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false || strpos($_SERVER['HTTP_USER_AGENT'], 'Trident') !== false ) && strpos($_SERVER['HTTP_USER_AGENT'], 'Win') !== false ) { | 
| 75 |           $is_winIE = true; |