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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 |
|---|---|
| 1957 | |
| 1958 | /** |
| 1959 | * Filters the comment moderation email headers. |
| 1960 | * |
| 1961 | * @since 2.8.0 |
| 1962 | * |
| 1963 | * @param string $message_headers Headers for the comment moderation email. |
| 1964 | * @param int $comment_id Comment ID. |
| 1965 | */ |
| 1966 | $message_headers = apply_filters( 'comment_moderation_headers', $message_headers, $comment_id ); |
| 1967 | |
| 1968 | foreach ( $emails as $email ) { |
| 1969 | $user = get_user_by( 'email', $email ); |
| 1970 | |
| 1971 | if ( $user ) { |
| 1972 | $switched_locale = switch_to_user_locale( $user->ID ); |
| 1973 | } else { |
| 1974 | $switched_locale = switch_to_locale( get_locale() ); |
| 1975 | } |