Send an attachment email file with wordpress 31.10.19

function bwc_send_email($coupon_id)
{
  $pdf = bwc_create_pdf($coupon_id);
  $_path = tempnam(sys_get_temp_dir(), "{$coupon_id}_");
  rename($_path, $_path .= '.pdf');
  file_put_contents( $_path, $pdf );
  $subject  = ! empty( get_option( 'bwc_subject' ) ) ? get_option( 'bwc_subject' ) : '';
  $message  = ! empty( get_option( 'bwc_email_message' ) ) ? get_option( 'bwc_email_message' ) : esc_html__( 'Please download the PDF', "BWC_translate" );
  $mail_settings = ! empty( get_option( 'woocommerce_email_from_address' ) ) ? get_option( 'woocommerce_email_from_address' ) : get_bloginfo( 'admin_email' );
  $from_settings = ! empty( get_option( 'woocommerce_email_from_name' ) ) ? get_option( 'woocommerce_email_from_name' ) : get_bloginfo( 'name' );
  $headers  = 'MIME-Version: 1.0' . "\r\n";
  $headers .= "Content-Type: text/html\n";
  $headers  = 'From: ' . $from_settings . ' <' . $mail_settings . '>' . "\r\n" . 'Reply-To: ' . $mail_settings . '' . "\r\n";
  $r = wp_mail( 'veto@myridia.com', $subject, $message, $headers, [$_path]);
  unlink($_path);
  return 'ok';
}

https://www.php.net/manual/en/function.tempnam.php

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Send an attachment email file with wordpress 31.10.19

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