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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 |
|---|---|
| 196 | * @param string|array $to Array or comma-separated list of email addresses to send message. |
| 197 | * @param string $subject Email subject |
| 198 | * @param string $message Message contents |
| 199 | * @param string|array $headers Optional. Additional headers. |
| 200 | * @param string|array $attachments Optional. Files to attach. |
| 201 | * @return bool Whether the email contents were sent successfully. |
| 202 | */ |
| 203 | function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) { |
| 204 | // Compact the input, apply the filters, and extract them back out |
| 205 | extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ) ); |
| 206 | |
| 207 | if ( !is_array($attachments) ) |
| 208 | $attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) ); |
| 209 | |
| 210 | global $phpmailer; |
| 211 | |
| 212 | // (Re)create it, if it's gone missing |
| 213 | if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) { |
| 214 | require_once ABSPATH . WPINC . '/class-phpmailer.php'; |