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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 |
---|---|
492 | // Set the content-type and charset |
493 |
|
494 | /** |
495 | * Filter the default wp_mail() charset. |
496 | * |
497 | * @since 2.3.0 |
498 | * |
499 | * @param string $charset Default email charset. |
500 | */ |
501 | $phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset ); |
502 |
|
503 | // Set custom headers |
504 | if ( !empty( $headers ) ) { |
505 | foreach( (array) $headers as $name => $content ) { |
506 | $phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) ); |
507 | } |
508 |
|
509 | if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) ) |
510 | $phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) ); |