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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 |
|---|---|
| 4361 | } |
| 4362 | } |
| 4363 | |
| 4364 | // Set Content-Type if we don't have a content-type from the input headers. |
| 4365 | if ( ! isset( $content_type ) ) { |
| 4366 | $content_type = 'text/plain'; |
| 4367 | } |
| 4368 | |
| 4369 | /** This filter is documented in wp-includes/pluggable.php */ |
| 4370 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 4371 | |
| 4372 | if ( 'text/html' === $content_type ) { |
| 4373 | $mail['message'] = wp_staticize_emoji( $mail['message'] ); |
| 4374 | } |
| 4375 | |
| 4376 | return $mail; |
| 4377 | } |
| 4378 | |