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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 |
|---|---|
| 3668 | // Pull only the first 8kiB of the file in. |
| 3669 | $file_data = fread( $fp, 8192 ); |
| 3670 | |
| 3671 | // PHP will close file handle, but we are good citizens. |
| 3672 | fclose( $fp ); |
| 3673 | |
| 3674 | // Make sure we catch CR-only line endings. |
| 3675 | $file_data = str_replace( "\r", "\n", $file_data ); |
| 3676 | |
| 3677 | if ( $context && $extra_headers = apply_filters( "extra_{$context}_headers", array() ) ) { |
| 3678 | $extra_headers = array_combine( $extra_headers, $extra_headers ); // keys equal values |
| 3679 | $all_headers = array_merge( $extra_headers, (array) $default_headers ); |
| 3680 | } else { |
| 3681 | $all_headers = $default_headers; |
| 3682 | } |
| 3683 | |
| 3684 | foreach ( $all_headers as $field => $regex ) { |
| 3685 | if ( preg_match( '/^[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] ) |
| 3686 | $all_headers[ $field ] = _cleanup_header_comment( $match[1] ); |