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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 |
|---|---|
| 4443 | $fp = fopen( $file, 'r' ); |
| 4444 | |
| 4445 | // Pull only the first 8kiB of the file in. |
| 4446 | $file_data = fread( $fp, 8192 ); |
| 4447 | |
| 4448 | // PHP will close file handle, but we are good citizens. |
| 4449 | fclose( $fp ); |
| 4450 | |
| 4451 | if ( $context != '' ) { |
| 4452 | $extra_headers = apply_filters( "extra_{$context}_headers", array() ); |
| 4453 | |
| 4454 | $extra_headers = array_flip( $extra_headers ); |
| 4455 | foreach( $extra_headers as $key=>$value ) { |
| 4456 | $extra_headers[$key] = $key; |
| 4457 | } |
| 4458 | $all_headers = array_merge( $extra_headers, (array) $default_headers ); |
| 4459 | } else { |
| 4460 | $all_headers = $default_headers; |
| 4461 | } |