Discount Based on Quantity
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| <?php | |
| /** | |
| * Discount based on the quantity. | |
| * Type : Per Quantity, Fixed Price, Percentage | |
| */ | |
| function wc_before_calculate_totals_callback( $cart_object ) { | |
| $quantity_price = array( | |
| '2' => '90', // 10% discount for 2 qty | |
| '3' => '85', // 15% discount for 3 qty | |
| '4' => '80', // 20% discount for 4 qty | |
| '8' => '75', // 25% discount for 8 qty | |
| '9' => '72', // 28% discount for 9 and more qty | |
| ); | |
| $quantity_price_keys = array_keys( $quantity_price ); | |
| $quantity_price_size = sizeof( $quantity_price_keys ); | |
| $quantity_min = min( $quantity_price_keys ); | |
| $type = 'percent'; // per_qty or fixed or percent | |
| foreach ( $cart_object->get_cart() as $hash => $value ) { | |
| $quantity = $value['quantity']; | |
| if ( $quantity >= $quantity_min ) { | |
| $closest_qty = wc_find_closest( $quantity_price_keys, $quantity_price_size, $quantity ); | |
| switch ( $type ) { | |
| case 'per_qty': | |
| $value['data']->set_price( $quantity_price[ $closest_qty ] ); | |
| break; | |
| case 'fixed': | |
| $value['data']->set_price( $quantity_price[ $closest_qty ] / $quantity ); | |
| break; | |
| case 'percent': | |
| $price = $value['data']->get_price(); | |
| $new_price = $price * ( $quantity_price[ $closest_qty ] / 100 ); | |
| $value['data']->set_price( $new_price ); | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| add_action( 'woocommerce_before_calculate_totals', 'wc_before_calculate_totals_callback', 20, 1 ); | |
| /* Function to find closest quantity */ | |
| function wc_find_closest( $arr, $n, $target ) { | |
| // Corner cases | |
| if ( $target <= $arr[0] ) | |
| return $arr[0]; | |
| if ( $target >= $arr[$n - 1] ) | |
| return $arr[$n - 1]; | |
| // Doing binary search | |
| $i = 0; | |
| $j = $n; | |
| $mid = 0; | |
| while ( $i < $j ) { | |
| $mid = ($i + $j) / 2; | |
| if ( $arr[$mid] == $target ) | |
| return $arr[$mid]; | |
| if ( $target < $arr[ $mid ] ) { | |
| if ( $mid > 0 && $target > $arr[ $mid - 1 ] ) | |
| return wc_get_closest( $arr[ $mid - 1 ], $arr[ $mid ], $target ); | |
| /* Repeat for left half */ | |
| $j = $mid; | |
| } else { // If target is greater than mid | |
| if ( $mid < $n - 1 && $target < $arr[ $mid + 1 ] ) | |
| return wc_get_closest( $arr[$mid], $arr[ $mid + 1 ], $target ); | |
| // update i | |
| $i = $mid + 1; | |
| } | |
| } | |
| // Only single element left after search | |
| return $arr[$mid]; | |
| } | |
| /* Function to get closest quantity */ | |
| function wc_get_closest( $val1, $val2, $target ) { | |
| if ( $target - $val1 >= $val2 - $target ) | |
| return $val2; | |
| else | |
| return $val1; | |
| } |