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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 4165 | $fp = fopen( $file, 'r' ); |
| 4166 | |
| 4167 | // Pull only the first 8kiB of the file in. |
| 4168 | $file_data = fread( $fp, 8192 ); |
| 4169 | |
| 4170 | // PHP will close file handle, but we are good citizens. |
| 4171 | fclose( $fp ); |
| 4172 | |
| 4173 | if ( $context != '' ) { |
| 4174 | $extra_headers = apply_filters( "extra_$context".'_headers', array() ); |
| 4175 | |
| 4176 | $extra_headers = array_flip( $extra_headers ); |
| 4177 | foreach( $extra_headers as $key=>$value ) { |
| 4178 | $extra_headers[$key] = $key; |
| 4179 | } |
| 4180 | $all_headers = array_merge($extra_headers, $default_headers); |
| 4181 | } else { |
| 4182 | $all_headers = $default_headers; |
| 4183 | } |