2016 Update

Task/Sorting-algorithms-Quicksort/PHP/sorting-algorithms-quicksort-2.php

@@ -0,0 +1,18 @@
+function quickSort(array $array) {
+    // base case
+    if (empty($array)) {
+        return $array;
+    }
+    $head = array_shift($array);
+    $tail = $array;
+    $lesser = array_filter($tail, function ($item) use ($head) {
+        return $item <= $head;
+    });
+    $bigger = array_filter($tail, function ($item) use ($head) {
+        return $item > $head;
+    });
+    return array_merge(quickSort($lesser), [$head], quickSort($bigger));
+}
+$testCase = [1, 4, 8, 2, 8, 0, 2, 8];
+$result = quickSort($testCase);
+echo sprintf("[%s] ==> [%s]\n", implode(', ', $testCase), implode(', ', $result));