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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 |
|---|---|
| 1965 | |
| 1966 | /** |
| 1967 | * Filters the comment notification email subject. |
| 1968 | * |
| 1969 | * @since 1.5.2 |
| 1970 | * |
| 1971 | * @param string $subject The comment notification email subject. |
| 1972 | * @param string $comment_id Comment ID as a numeric string. |
| 1973 | */ |
| 1974 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID ); |
| 1975 | |
| 1976 | wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); |
| 1977 | |
| 1978 | if ( $switched_locale ) { |
| 1979 | restore_previous_locale(); |
| 1980 | } |
| 1981 | } |
| 1982 | |
| 1983 | return true; |