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<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName /** * Lets you round the numeric elements of an array to integers while preserving their sum. * * Usage: * * Jetpack_Constrained_Array_Rounding::get_rounded_constrained_array( $bound_array ) * if a specific sum doesn't need to be specified for the bound array * * Jetpack_Constrained_Array_Rounding::get_rounded_constrained_array( $bound_array, $sum ) * If the sum of $bound_array must equal $sum after rounding. * * If $sum is less than the sum of the floor of the elements of the array, the class defaults to using the sum of the array elements. */ class Jetpack_Constrained_Array_Rounding { /** * Get the rounded constrained array. * * @param array $bound_array - the array we're rounding. * @param int $sum - the sum of the array. * * @return array */ public static function get_rounded_constrained_array( $bound_array, $sum = false ) { // Convert associative arrays before working with them and convert them back before returning the values $keys = array_keys( $bound_array ); $bound_array = array_values( $bound_array ); $bound_array_int = self::get_int_floor_array( $bound_array ); $lower_sum = array_sum( wp_list_pluck( $bound_array_int, 'floor' ) ); if ( ! $sum || ( $sum < $lower_sum ) ) { // If value of sum is not supplied or is invalid, calculate the sum that the returned array is constrained to match $sum = array_sum( $bound_array ); } $diff_sum = $sum - $lower_sum; self::adjust_constrained_array( $bound_array_int, $diff_sum ); $bound_array_fin = wp_list_pluck( $bound_array_int, 'floor' ); return array_combine( $keys, $bound_array_fin ); } /** * Get int floor of array values. * * @param array $bound_array - the array we're getting floor values for. * * @return array */ private static function get_int_floor_array( $bound_array ) { $bound_array_int_floor = array(); foreach ( $bound_array as $i => $value ) { $bound_array_int_floor[ $i ] = array( 'floor' => (int) floor( $value ), 'fraction' => $value - floor( $value ), 'index' => $i, ); } return $bound_array_int_floor; } /** * Adjust the constrained array. * * @param array $bound_array_int - the array we're adjusting. * @param int $adjustment - how much we're adjusting the array. */ private static function adjust_constrained_array( &$bound_array_int, $adjustment ) { usort( $bound_array_int, array( self::class, 'cmp_desc_fraction' ) ); $start = 0; $end = $adjustment - 1; $length = count( $bound_array_int ); for ( $i = $start; $i <= $end; $i++ ) { ++$bound_array_int[ $i % $length ]['floor']; } usort( $bound_array_int, array( self::class, 'cmp_asc_index' ) ); } /** * Compare fraction values of two arrays. * * @param array $a - the first array we're comparing. * @param array $b - the second array we're comparing. * * @return int */ private static function cmp_desc_fraction( $a, $b ) { return $b['fraction'] <=> $a['fraction']; } /** * Compare index values of two arrays. * * @param array $a - the first array. * @param array $b - the second array. * * @return int */ private static function cmp_asc_index( $a, $b ) { return $a['index'] <=> $b['index']; } }
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