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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 |
|---|---|
| 361 | // Set to use PHP's mail() |
| 362 | $phpmailer->IsMail(); |
| 363 | |
| 364 | // Set Content-Type and charset |
| 365 | // If we don't have a content-type from the input headers |
| 366 | if ( !isset( $content_type ) ) { |
| 367 | $content_type = 'text/plain'; |
| 368 | } |
| 369 | |
| 370 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 371 | |
| 372 | // Set whether it's plaintext or not, depending on $content_type |
| 373 | if ( $content_type == 'text/html' ) { |
| 374 | $phpmailer->IsHTML( true ); |
| 375 | } else { |
| 376 | $phpmailer->IsHTML( false ); |
| 377 | } |
| 378 | |
| 379 | // If we don't have a charset from the input headers |