| 1 |
<?php |
| 2 |
|
| 3 |
/** |
| 4 |
* Lets you round the numeric elements of an array to integers while preserving their sum. |
| 5 |
* |
| 6 |
* Usage: |
| 7 |
* |
| 8 |
* Jetpack_Constrained_Array_Rounding::get_rounded_constrained_array( $bound_array ) |
| 9 |
* if a specific sum doesn't need to be specified for the bound array |
| 10 |
* |
| 11 |
* Jetpack_Constrained_Array_Rounding::get_rounded_constrained_array( $bound_array, $sum ) |
| 12 |
* If the sum of $bound_array must equal $sum after rounding. |
| 13 |
* |
| 14 |
* 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. |
| 15 |
*/ |
| 16 |
if( ! class_exists( 'Catch_Gallery_Constrained_Array_Rounding' ) ) : |
| 17 |
class Catch_Gallery_Constrained_Array_Rounding { |
| 18 |
public static function get_rounded_constrained_array( $bound_array, $sum = false ) { |
| 19 |
// Convert associative arrays before working with them and convert them back before returning the values |
| 20 |
$keys = array_keys( $bound_array ); |
| 21 |
$bound_array = array_values( $bound_array ); |
| 22 |
|
| 23 |
$bound_array_int = self::get_int_floor_array( $bound_array ); |
| 24 |
|
| 25 |
$lower_sum = array_sum( wp_list_pluck( $bound_array_int, 'floor' ) ); |
| 26 |
if ( ! $sum || ( $sum < $lower_sum ) ) { |
| 27 |
// If value of sum is not supplied or is invalid, calculate the sum that the returned array is constrained to match |
| 28 |
$sum = array_sum( $bound_array ); |
| 29 |
} |
| 30 |
$diff_sum = $sum - $lower_sum; |
| 31 |
|
| 32 |
self::adjust_constrained_array( $bound_array_int, $diff_sum ); |
| 33 |
|
| 34 |
$bound_array_fin = wp_list_pluck( $bound_array_int, 'floor' ); |
| 35 |
return array_combine( $keys, $bound_array_fin ); |
| 36 |
} |
| 37 |
|
| 38 |
private static function get_int_floor_array( $bound_array ) { |
| 39 |
$bound_array_int_floor = array(); |
| 40 |
foreach ( $bound_array as $i => $value ){ |
| 41 |
$bound_array_int_floor[$i] = array( |
| 42 |
'floor' => (int) floor( $value ), |
| 43 |
'fraction' => $value - floor( $value ), |
| 44 |
'index' => $i, |
| 45 |
); |
| 46 |
} |
| 47 |
|
| 48 |
return $bound_array_int_floor; |
| 49 |
} |
| 50 |
|
| 51 |
private static function adjust_constrained_array( &$bound_array_int, $adjustment ) { |
| 52 |
usort( $bound_array_int, array( 'self', 'cmp_desc_fraction' ) ); |
| 53 |
|
| 54 |
$start = 0; |
| 55 |
$end = $adjustment - 1; |
| 56 |
$length = count( $bound_array_int ); |
| 57 |
|
| 58 |
for ( $i = $start; $i <= $end; $i++ ) { |
| 59 |
$bound_array_int[ $i % $length ]['floor']++; |
| 60 |
} |
| 61 |
|
| 62 |
usort( $bound_array_int, array( 'self', 'cmp_asc_index' ) ); |
| 63 |
} |
| 64 |
|
| 65 |
private static function cmp_desc_fraction( $a, $b ) { |
| 66 |
if ( $a['fraction'] == $b['fraction'] ) |
| 67 |
return 0; |
| 68 |
return $a['fraction'] > $b['fraction'] ? -1 : 1; |
| 69 |
} |
| 70 |
|
| 71 |
private static function cmp_asc_index( $a, $b ) { |
| 72 |
if ( $a['index'] == $b['index'] ) |
| 73 |
return 0; |
| 74 |
return $a['index'] < $b['index'] ? -1 : 1; |
| 75 |
} |
| 76 |
} |
| 77 |
endif; |
