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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 |
|---|---|
| 227 | |
| 228 | /** |
| 229 | * Filter the wp_mail() arguments. |
| 230 | * |
| 231 | * @since 2.2.0 |
| 232 | * |
| 233 | * @param array $args A compacted array of wp_mail() arguments, including the "to" email, |
| 234 | * subject, message, headers, and attachments values. |
| 235 | */ |
| 236 | extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ) ); |
| 237 | |
| 238 | if ( !is_array($attachments) ) |
| 239 | $attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) ); |
| 240 | |
| 241 | global $phpmailer; |
| 242 | |
| 243 | // (Re)create it, if it's gone missing |
| 244 | if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) { |
| 245 | require_once ABSPATH . WPINC . '/class-phpmailer.php'; |