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<?php function quicksort($array) { if (count($array) <= 1) { return $array; } $pivot = array_shift($array); // ピボットの選択 $left = $right = array(); foreach ($array as $value) { if ($value < $pivot) { $left[] = $value; } else { $right[] = $value; } } // 左右のデータを再帰的にソートする return array_merge(quicksort($left), array($pivot), quicksort($right)); } $array = array( 6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1,6, 4, 3, 7, 8, 5, 2, 9, 1, ); $array = quicksort($array); var_dump($array); // 1, 2, 3, 4, 5, 6, 7, 8, 9

Version	System time (s)	User time (s)	Memory (MiB)
8.3.6	0.014	0.021	17.63
8.3.5	0.012	0.017	18.09
8.3.4	0.020	0.013	19.84
8.3.3	0.025	0.007	19.71
8.3.2	0.009	0.006	19.49
8.3.1	0.009	0.012	19.81
8.3.0	0.006	0.009	19.38
8.2.18	0.009	0.015	25.92
8.2.17	0.015	0.022	19.91
8.2.16	0.011	0.014	22.96
8.2.15	0.009	0.006	24.18
8.2.14	0.003	0.010	24.66
8.2.13	0.007	0.007	26.16
8.2.12	0.010	0.003	19.77
8.2.11	0.015	0.004	21.27
8.2.10	0.007	0.014	18.84
8.2.9	0.007	0.007	18.91
8.2.8	0.003	0.010	21.41
8.2.7	0.003	0.010	18.93
8.2.6	0.010	0.003	19.03
8.2.5	0.007	0.007	18.50
8.2.4	0.006	0.006	20.23
8.2.3	0.005	0.008	20.39
8.2.2	0.004	0.011	19.48
8.2.1	0.003	0.010	19.40
8.2.0	0.005	0.008	18.69
8.1.28	0.015	0.011	25.92
8.1.27	0.006	0.010	23.99
8.1.26	0.007	0.007	26.35
8.1.25	0.012	0.003	28.09
8.1.24	0.012	0.006	25.93
8.1.23	0.010	0.010	22.84
8.1.22	0.012	0.003	19.75
8.1.21	0.009	0.006	20.52
8.1.20	0.011	0.008	19.23
8.1.19	0.007	0.007	18.98
8.1.18	0.007	0.010	19.41
8.1.17	0.007	0.007	20.40
8.1.16	0.008	0.008	20.79
8.1.15	0.003	0.010	20.35
8.1.14	0.003	0.010	19.21
8.1.13	0.003	0.010	20.59
8.1.12	0.011	0.007	19.23
8.1.11	0.011	0.003	19.13
8.1.10	0.011	0.003	19.15
8.1.9	0.010	0.003	19.26
8.1.8	0.000	0.013	19.11
8.1.7	0.007	0.007	19.19
8.1.6	0.010	0.010	19.41
8.1.5	0.006	0.013	19.27
8.1.4	0.003	0.014	19.38
8.1.3	0.010	0.010	19.30
8.1.2	0.006	0.010	19.37
8.1.1	0.000	0.016	19.36
8.1.0	0.007	0.010	19.26
8.0.30	0.000	0.014	21.84
8.0.29	0.003	0.010	18.50
8.0.28	0.004	0.008	20.15
8.0.27	0.006	0.006	18.93
8.0.26	0.008	0.004	20.10
8.0.25	0.012	0.003	18.54
8.0.24	0.000	0.015	18.61
8.0.23	0.010	0.005	18.53
8.0.22	0.013	0.006	18.43
8.0.21	0.009	0.003	18.45
8.0.20	0.003	0.010	18.52
8.0.19	0.007	0.010	18.60
8.0.18	0.004	0.011	18.52
8.0.17	0.008	0.008	18.44
8.0.16	0.007	0.007	18.56
8.0.15	0.007	0.010	18.46
8.0.14	0.003	0.013	18.46
8.0.13	0.004	0.008	15.02
8.0.12	0.007	0.010	18.36
8.0.11	0.000	0.016	18.55
8.0.10	0.000	0.014	18.34
8.0.9	0.003	0.012	18.43
8.0.8	0.016	0.013	18.44
8.0.7	0.007	0.007	18.35
8.0.6	0.011	0.006	18.32
8.0.5	0.009	0.006	18.42
8.0.3	0.025	0.032	18.64
8.0.2	0.026	0.023	18.63
8.0.1	0.006	0.008	18.46
8.0.0	0.027	0.029	18.38
7.4.33	0.003	0.009	14.77
7.4.32	0.007	0.007	18.23
7.4.30	0.004	0.008	18.09
7.4.29	0.003	0.010	18.14
7.4.28	0.009	0.013	17.94
7.4.27	0.011	0.003	18.18
7.4.26	0.006	0.006	14.90
7.4.25	0.007	0.010	17.95
7.4.24	0.014	0.000	18.10
7.4.23	0.000	0.017	18.19
7.4.22	0.020	0.026	18.09
7.4.21	0.015	0.022	17.97
7.4.20	0.011	0.004	18.01
7.4.19	0.011	0.003	18.06
7.4.16	0.024	0.014	18.29
7.4.15	0.016	0.028	18.18
7.4.14	0.017	0.028	18.05
7.4.13	0.020	0.024	18.26
7.4.12	0.031	0.021	18.22
7.4.11	0.026	0.017	18.11
7.4.10	0.028	0.031	18.28
7.4.9	0.017	0.027	18.19
7.4.8	0.011	0.030	19.39
7.4.7	0.009	0.030	18.05
7.4.6	0.014	0.027	18.09
7.4.5	0.004	0.007	18.28
7.4.4	0.015	0.027	18.03
7.4.3	0.014	0.029	18.08
7.4.0	0.000	0.024	16.75
7.3.33	0.004	0.008	14.95
7.3.32	0.000	0.013	14.99
7.3.31	0.006	0.009	17.89
7.3.30	0.003	0.010	17.85
7.3.29	0.006	0.029	17.96
7.3.28	0.013	0.023	17.78
7.3.27	0.017	0.030	17.86
7.3.26	0.014	0.026	18.27
7.3.24	0.030	0.023	17.90
7.3.23	0.019	0.022	18.16
7.3.21	0.026	0.026	18.03
7.3.20	0.018	0.021	17.90
7.3.19	0.024	0.028	18.14
7.3.18	0.024	0.031	17.91
7.3.17	0.021	0.024	18.07
7.3.16	0.012	0.027	18.00
7.3.12	0.022	0.016	16.43
7.2.33	0.023	0.023	18.16
7.2.32	0.020	0.032	18.27
7.2.31	0.016	0.025	18.06
7.2.30	0.012	0.030	18.05
7.2.29	0.020	0.023	18.39
7.2.0	0.004	0.014	21.61
7.1.10	0.006	0.013	20.25
7.1.7	0.006	0.009	19.22
7.1.6	0.026	0.016	19.21
7.1.5	0.003	0.035	18.85
7.0.20	0.003	0.019	18.46