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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 |
|---|---|
| 488 | // Set the content-type and charset |
| 489 | |
| 490 | /** |
| 491 | * Filter the default wp_mail() charset. |
| 492 | * |
| 493 | * @since 2.3.0 |
| 494 | * |
| 495 | * @param string $charset Default email charset. |
| 496 | */ |
| 497 | $phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset ); |
| 498 | |
| 499 | // Set custom headers |
| 500 | if ( !empty( $headers ) ) { |
| 501 | foreach( (array) $headers as $name => $content ) { |
| 502 | $phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) ); |
| 503 | } |
| 504 | |
| 505 | if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) ) |
| 506 | $phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) ); |