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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 |
|---|---|
| 264 | * @param string|array $to Array or comma-separated list of email addresses to send message. |
| 265 | * @param string $subject Email subject |
| 266 | * @param string $message Message contents |
| 267 | * @param string|array $headers Optional. Additional headers. |
| 268 | * @param string|array $attachments Optional. Files to attach. |
| 269 | * @return bool Whether the email contents were sent successfully. |
| 270 | */ |
| 271 | function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) { |
| 272 | // Compact the input, apply the filters, and extract them back out |
| 273 | extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ) ); |
| 274 | |
| 275 | if ( !is_array($attachments) ) |
| 276 | $attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) ); |
| 277 | |
| 278 | global $phpmailer; |
| 279 | |
| 280 | // (Re)create it, if it's gone missing |
| 281 | if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) { |
| 282 | require_once ABSPATH . WPINC . '/class-phpmailer.php'; |