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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 |
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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; |