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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 |
|---|---|
| 442 | // Set the content-type and charset |
| 443 | |
| 444 | /** |
| 445 | * Filters the default wp_mail() charset. |
| 446 | * |
| 447 | * @since 2.3.0 |
| 448 | * |
| 449 | * @param string $charset Default email charset. |
| 450 | */ |
| 451 | $phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset ); |
| 452 | |
| 453 | // Set custom headers. |
| 454 | if ( ! empty( $headers ) ) { |
| 455 | foreach ( (array) $headers as $name => $content ) { |
| 456 | // Only add custom headers not added automatically by PHPMailer. |
| 457 | if ( ! in_array( $name, array( 'MIME-Version', 'X-Mailer' ) ) ) { |
| 458 | $phpmailer->addCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) ); |
| 459 | } |
| 460 | } |