woocommerce_email_headers, , backorder, $args, null

apply_filters('woocommerce_email_headers, , backorder, $args, null') is found 1 times:

• /includes/class-wc-emails.php line 1267

  			* @param string $headers The email headers.
  			* @param array $args Arguments.
  			* @param null $null Unused.
  			*/
  			apply_filters( 'woocommerce_email_headers', '', 'backorder', $args, null ),
  			/**
  			* Filter the attachments of the backorder notification email.
  			*
  			* @since 3.0.0
  			* @param array $attachments The email attachments.
  			* @param array $args Arguments.
  

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