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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 |
|---|---|
| 403 | |
| 404 | // Set to use PHP's mail() |
| 405 | $phpmailer->IsMail(); |
| 406 | |
| 407 | // Set Content-Type and charset |
| 408 | // If we don't have a content-type from the input headers |
| 409 | if ( !isset( $content_type ) ) |
| 410 | $content_type = 'text/plain'; |
| 411 | |
| 412 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 413 | |
| 414 | $phpmailer->ContentType = $content_type; |
| 415 | |
| 416 | // Set whether it's plaintext, depending on $content_type |
| 417 | if ( 'text/html' == $content_type ) |
| 418 | $phpmailer->IsHTML( true ); |
| 419 | |
| 420 | // If we don't have a charset from the input headers |
| 421 | if ( !isset( $charset ) ) |