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Editing: class-constrained-array-rounding.php
<?php /** * 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 { 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 ); } 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 $bound_array_int_floor; } private static function adjust_constrained_array( &$bound_array_int, $adjustment ) { usort( $bound_array_int, array( 'self', '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', 'cmp_asc_index' ) ); } private static function cmp_desc_fraction( $a, $b ) { if ( $a['fraction'] == $b['fraction'] ) { return 0; } return $a['fraction'] > $b['fraction'] ? -1 : 1; } private static function cmp_asc_index( $a, $b ) { if ( $a['index'] == $b['index'] ) { return 0; } return $a['index'] < $b['index'] ? -1 : 1; } }
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