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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 |
|---|---|
| 161 | global $phpmailer; |
| 162 | |
| 163 | if ( !is_object( $phpmailer ) ) { |
| 164 | require_once(ABSPATH . WPINC . '/class-phpmailer.php'); |
| 165 | require_once(ABSPATH . WPINC . '/class-smtp.php'); |
| 166 | $phpmailer = new PHPMailer(); |
| 167 | } |
| 168 | |
| 169 | $mail = compact('to', 'subject', 'message', 'headers'); |
| 170 | $mail = apply_filters('wp_mail', $mail); |
| 171 | extract($mail); |
| 172 | |
| 173 | if ( $headers == '' ) { |
| 174 | $headers = "MIME-Version: 1.0\n" . |
| 175 | "From: " . apply_filters('wp_mail_from', "wordpress@" . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME']))) . "\n" . |
| 176 | "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 177 | } |
| 178 | |
| 179 | $phpmailer->ClearAddresses(); |