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<?php
if( woocommerce_version_check() ) {
    // Use new, updated functions
} else {
    // Use older, deprecated functions
}
?>

<?php
function woocommerce_version_check( $version = '3.0' ) {
  if ( class_exists( 'WooCommerce' ) ) {
    global $woocommerce;
    if( version_compare( $woocommerce->version, $version, ">=" ) ) {
      return true;
    }
  }
  return false;
}
?>