Allow only one product into woocommerce cart

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add_filter( ‘woocommerce_add_to_cart_validation’, ‘aviweb_only_one_in_cart’, 99, 2 );

function aviweb_only_one_in_cart( $passed, $added_product_id ) {
// empty cart and new item will replace previous
wc_empty_cart();
return $passed;
}

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