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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Data\Utils; |
| 4 | |
| 5 | /** |
| 6 | * Performs the equivalent of an SQL ORDER BY c1 ASC, c2 ASC... |
| 7 | * Always sorts in ascending order. array_reverse to get all descending. |
| 8 | * For varied asc/desc needs implementation changes. |
| 9 | * |
| 10 | * usage: usort( $array, new SortArrayByKeys( [ 'c1', 'c2' ] ) ); |
| 11 | */ |
| 12 | class SortArrayByKeys { |
| 13 | /** @var array */ |
| 14 | protected $keys; |
| 15 | /** @var bool */ |
| 16 | protected $strict; |
| 17 | |
| 18 | public function __construct( array $keys, $strict = false ) { |
| 19 | $this->keys = $keys; |
| 20 | $this->strict = $strict; |
| 21 | } |
| 22 | |
| 23 | public function __invoke( $a, $b ) { |
| 24 | return self::compare( $a, $b, $this->keys, $this->strict ); |
| 25 | } |
| 26 | |
| 27 | public static function compare( $a, $b, array $keys, $strict = false ) { |
| 28 | $key = array_shift( $keys ); |
| 29 | if ( !isset( $a[$key] ) ) { |
| 30 | return isset( $b[$key] ) ? -1 : 0; |
| 31 | } elseif ( !isset( $b[$key] ) ) { |
| 32 | return 1; |
| 33 | } elseif ( $strict ? $a[$key] === $b[$key] : $a[$key] == $b[$key] ) { |
| 34 | return $keys ? self::compare( $a, $b, $keys, $strict ) : 0; |
| 35 | } else { // is there such a thing as strict gt/lt ? |
| 36 | return $a[$key] <=> $b[$key]; |
| 37 | } |
| 38 | } |
| 39 | } |