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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 |
|---|---|
| 410 | $phpmailer->IsHTML( true ); |
| 411 | } |
| 412 | |
| 413 | // If we don't have a charset from the input headers |
| 414 | if ( !isset( $charset ) ) { |
| 415 | $charset = get_bloginfo( 'charset' ); |
| 416 | } |
| 417 | |
| 418 | // Set the content-type and charset |
| 419 | $phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset ); |
| 420 | |
| 421 | // Set custom headers |
| 422 | if ( !empty( $headers ) ) { |
| 423 | foreach( (array) $headers as $name => $content ) { |
| 424 | $phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) ); |
| 425 | } |
| 426 | if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) ) { |
| 427 | $phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) ); |
| 428 | } |