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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 |
|---|---|
| 59 | if ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chromeframe' ) !== false ) { |
| 60 | $is_admin = is_admin(); |
| 61 | /** |
| 62 | * Filters whether Google Chrome Frame should be used, if available. |
| 63 | * |
| 64 | * @since 3.2.0 |
| 65 | * |
| 66 | * @param bool $is_admin Whether to use the Google Chrome Frame. Default is the value of is_admin(). |
| 67 | */ |
| 68 | if ( $is_chrome = apply_filters( 'use_google_chrome_frame', $is_admin ) ) |
| 69 | header( 'X-UA-Compatible: chrome=1' ); |
| 70 | $is_winIE = ! $is_chrome; |
| 71 | } else { |
| 72 | $is_chrome = true; |
| 73 | } |
| 74 | } elseif ( stripos($_SERVER['HTTP_USER_AGENT'], 'safari') !== false ) { |
| 75 | $is_safari = true; |
| 76 | } elseif ( ( strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false || strpos($_SERVER['HTTP_USER_AGENT'], 'Trident') !== false ) && strpos($_SERVER['HTTP_USER_AGENT'], 'Win') !== false ) { |
| 77 | $is_winIE = true; |