Rounding.php
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<?php
namespace ACA\WC\Helper\Price;
class Rounding {
/**
* @param float $price
* @param int $decimals
*
* @return float
*/
public function up( $price, $decimals = 0 ) {
$decimals = rtrim( $decimals, 0 );
if ( ! $decimals ) {
$decimals = 0;
}
$digits = strlen( $decimals );
$divider = pow( 10, $digits );
$rounding = absint( $decimals );
$fraction = absint( $divider * ( $price - floor( $price ) ) );
if ( $fraction < $rounding ) {
return floor( $price ) + ( $rounding / $divider );
}
return floor( $price ) + 1 + ( $rounding / $divider );
}
/**
* @param float $price
* @param int $decimals
*
* @return float
*/
public function down( $price, $decimals = 0 ) {
if ( $this->price_digits_are_same( $price, $decimals ) ) {
return $price;
}
$decimals = rtrim( $decimals, 0 );
$digits = strlen( $decimals );
$divider = pow( 10, $digits );
$rounding = absint( $decimals );
$fraction = absint( $divider * ( $price - floor( $price ) ) );
if ( $fraction >= $rounding ) {
return floor( $price ) + ( $rounding / $divider );
}
return floor( $price ) - 1 + ( $rounding / $divider );
}
/**
* @param float $price
* @param int $decimals
*
* @return bool
*/
private function price_digits_are_same( $price, $decimals ) {
$price_digits = explode( '.', $price );
$price_decimals = rtrim( $price_digits[1], 0 );
$decimals = rtrim( $decimals, 0 );
return $price_decimals === $decimals;
}
}