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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 |
|---|---|
| 395 | // Set to use PHP's mail() |
| 396 | $phpmailer->IsMail(); |
| 397 | |
| 398 | // Set Content-Type and charset |
| 399 | // If we don't have a content-type from the input headers |
| 400 | if ( !isset( $content_type ) ) { |
| 401 | $content_type = 'text/plain'; |
| 402 | } |
| 403 | |
| 404 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 405 | |
| 406 | $phpmailer->ContentType = $content_type; |
| 407 | |
| 408 | // Set whether it's plaintext or not, depending on $content_type |
| 409 | if ( $content_type == 'text/html' ) { |
| 410 | $phpmailer->IsHTML( true ); |
| 411 | } |
| 412 | |
| 413 | // If we don't have a charset from the input headers |