woocommerce_email_subject_backorder, $subject, $args, null

apply_filters('woocommerce_email_subject_backorder, $subject, $args, null') is found 1 times:

• /includes/class-wc-emails.php line 1249

  			* @param string $subject The email subject.
  			* @param array $args Arguments.
  			* @param null $null Unused.
  			*/
  			apply_filters( 'woocommerce_email_subject_backorder', $subject, $args, null ),
  			/**
  			* Filter the content of the backorder notification email.
  			*
  			* @since 3.0.0
  			* @param string $message The email content.
  			* @param array $args Arguments.
  

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