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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 |
|---|---|
| 237 | // Set to use PHP's mail() |
| 238 | $phpmailer->IsMail(); |
| 239 | |
| 240 | // Set Content-Type and charset |
| 241 | // If we don't have a content-type from the input headers |
| 242 | if ( !isset( $content_type ) ) { |
| 243 | $content_type = 'text/plain'; |
| 244 | } |
| 245 | |
| 246 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 247 | |
| 248 | // Set whether it's plaintext or not, depending on $content_type |
| 249 | if ( $content_type == 'text/html' ) { |
| 250 | $phpmailer->IsHTML( true ); |
| 251 | } else { |
| 252 | $phpmailer->IsHTML( false ); |
| 253 | } |
| 254 | |
| 255 | // If we don't have a charset from the input headers |