3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "abcdefghijklmn"; $print = strrev($str); $st=""; for($i = 0;$i<$print.length;$i=$i+2) { if($i < $print.length - 1) $st .= substr($print,$i,$i+1); echo $st; }

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
8.3.60.0110.00418.31
8.3.50.0110.00721.21
8.3.40.0080.00818.79
8.3.30.0100.00319.04
8.3.20.0140.00020.07
8.3.10.0040.00422.10
8.3.00.0090.00020.49
8.2.180.0220.00016.63
8.2.170.0110.00722.96
8.2.160.0070.00719.20
8.2.150.0040.00424.18
8.2.140.0060.00324.66
8.2.130.0090.00926.16
8.2.120.0050.00319.66
8.2.110.0080.00022.13
8.2.100.0080.00319.46
8.2.90.0040.00419.22
8.2.80.0030.00617.97
8.2.70.0000.00817.50
8.2.60.0000.00917.92
8.2.50.0040.00418.07
8.2.40.0000.00818.16
8.2.30.0040.00418.04
8.2.20.0020.00517.69
8.2.10.0090.00017.80
8.2.00.0030.00617.79
8.1.280.0120.00325.92
8.1.270.0000.00920.36
8.1.260.0040.00426.35
8.1.250.0070.00028.09
8.1.240.0040.00423.96
8.1.230.0070.00419.21
8.1.220.0040.00417.91
8.1.210.0040.00418.77
8.1.200.0100.00017.35
8.1.190.0050.00317.65
8.1.180.0070.00018.88
8.1.170.0000.00818.38
8.1.160.0030.00322.14
8.1.150.0040.00418.62
8.1.140.0070.00017.45
8.1.130.0000.00817.81
8.1.120.0020.00517.44
8.1.110.0000.00817.33
8.1.100.0050.00217.44
8.1.90.0030.00317.34
8.1.80.0040.00417.45
8.1.70.0030.00317.46
8.1.60.0000.00817.55
8.1.50.0030.00517.39
8.1.40.0000.00717.50
8.1.30.0000.00817.61
8.1.20.0000.00817.68
8.1.10.0030.00517.43
8.1.00.0000.00817.54
8.0.300.0000.00718.77
8.0.290.0040.00417.03
8.0.280.0070.00018.31
8.0.270.0000.00717.15
8.0.260.0030.00316.86
8.0.250.0030.00316.98
8.0.240.0040.00417.04
8.0.230.0080.00017.04
8.0.220.0030.00516.83
8.0.210.0000.00716.82
8.0.200.0000.00716.91
8.0.190.0000.00816.89
8.0.180.0040.00417.00
8.0.170.0040.00416.86
8.0.160.0040.00417.04
8.0.150.0030.00316.89
8.0.140.0030.00316.89
8.0.130.0000.00613.36
8.0.120.0030.00516.84
8.0.110.0000.00716.97
8.0.100.0040.00416.94
8.0.90.0070.00016.88
8.0.80.0100.01416.92
8.0.70.0000.00716.96
8.0.60.0040.00416.84
8.0.50.0000.00716.87
8.0.30.0060.01217.16
8.0.20.0210.00117.40
8.0.10.0000.00717.17
8.0.00.0050.01416.88
7.4.330.0000.00615.00
7.4.320.0030.00316.57
7.4.300.0000.00616.43
7.4.290.0070.00016.40
7.4.280.0030.00616.48
7.4.270.0000.00616.46
7.4.260.0000.00716.45
7.4.250.0050.00316.54
7.4.240.0040.00316.48
7.4.230.0030.00316.68
7.4.220.0090.00916.57
7.4.210.0060.00816.58
7.4.200.0070.00016.29
7.4.190.0000.00716.49
7.4.160.0070.01316.51
7.4.150.0120.00617.40
7.4.140.0090.00917.86
7.4.130.0070.00916.58
7.4.120.0100.00716.53
7.4.110.0080.00816.46
7.4.100.0080.01116.55
7.4.90.0060.01316.49
7.4.80.0130.01019.39
7.4.70.0130.00316.40
7.4.60.0080.01116.64
7.4.50.0030.00316.19
7.4.40.0000.01422.77
7.4.30.0070.01316.32
7.4.00.0070.00715.14
7.3.330.0000.00513.09
7.3.320.0050.00013.12
7.3.310.0030.00316.18
7.3.300.0030.00316.24
7.3.290.0140.00416.20
7.3.280.0050.01116.24
7.3.270.0130.00317.40
7.3.260.0070.01516.16
7.3.250.0140.00416.33
7.3.240.0130.00616.24
7.3.230.0120.00616.39
7.3.210.0170.00316.37
7.3.200.0070.01019.39
7.3.190.0060.01516.51
7.3.180.0110.00316.31
7.3.170.0110.00516.34
7.3.160.0080.00816.30
7.3.120.0000.00814.86
7.2.330.0070.01216.41
7.2.320.0130.01116.66
7.2.310.0160.00316.60
7.2.300.0100.01016.49
7.2.290.0070.01116.47
7.2.80.0040.01116.37
7.2.60.0090.00916.91
7.2.50.0000.01216.99
7.2.00.0000.01419.55
7.1.200.0040.00415.52
7.1.70.0000.00816.93
7.1.60.0060.01619.82
7.1.50.0100.01016.99
7.1.00.0070.03022.54
7.0.200.0080.00316.45
7.0.140.0000.07721.98
7.0.60.0130.07320.03
7.0.50.0070.04317.83
7.0.40.0100.07019.95
7.0.30.0330.07020.16
7.0.20.0400.06720.19
7.0.10.0100.08320.16
7.0.00.0070.04720.20
5.6.280.0030.07320.89
5.6.210.0100.07020.74
5.6.200.0130.07718.10
5.6.190.0070.07020.60
5.6.180.0370.03720.78
5.6.170.0400.06020.38
5.6.160.0000.05320.50
5.6.150.0030.04018.16
5.6.140.0130.07018.09
5.6.130.0000.05718.20
5.6.120.0030.04321.02
5.6.110.0230.07320.99
5.6.100.0200.07320.97
5.6.90.0130.07721.12
5.6.80.0100.05020.35
5.5.350.0200.08320.45
5.5.340.0100.04017.94
5.5.330.0130.07720.21
5.5.320.0170.04320.31
5.5.310.0430.04720.22
5.5.300.0070.03717.98
5.5.290.0100.06317.96
5.5.280.0100.05320.65
5.5.270.0230.05720.82
5.5.260.0100.03720.75
5.5.250.0100.08720.57
5.5.240.0030.06320.26
5.4.450.0270.05319.55
5.4.440.0900.05719.41
5.4.430.0100.05319.31
5.4.420.0200.04319.46
5.4.410.0030.06019.41
5.4.400.0500.04718.68
5.4.390.0270.06018.49
5.4.380.0930.04718.66
5.4.370.0170.07318.67
5.4.360.0170.05018.57
5.4.350.0090.04511.98
5.4.340.0030.04211.97
5.4.320.0080.04212.45
5.4.310.0100.04312.45
5.4.300.0070.03512.45
5.4.290.0040.03912.45
5.4.280.0060.03612.35
5.4.270.0020.03912.35
5.4.260.0050.03812.35
5.4.250.0030.06318.69
5.4.240.0030.07019.03
5.4.230.0170.05018.88
5.4.220.0100.05718.97
5.4.210.0100.07018.90
5.4.200.0130.05318.71
5.4.190.0070.07018.68
5.4.180.0170.06718.65
5.4.170.0100.06318.88
5.4.160.0170.06718.64
5.4.150.0130.06718.73
5.4.140.0130.05316.27
5.4.130.0070.04716.28
5.4.120.0070.05316.48
5.4.110.0070.05016.43
5.4.100.0100.04716.45
5.4.90.0130.04016.49
5.4.80.0030.05316.48
5.4.70.0130.04316.41
5.4.60.0100.04316.47
5.4.50.0030.05316.50
5.4.40.0070.05016.52
5.4.30.0100.04716.52
5.4.20.0070.05016.39
5.4.10.0100.04716.31
5.4.00.0100.05315.71
5.3.290.0090.03612.80
5.3.280.0100.06314.59
5.3.270.0170.06014.30
5.3.260.0130.07314.70
5.3.250.0100.08014.52
5.3.240.0070.05014.30
5.3.230.0130.04314.61
5.3.220.0070.05314.58
5.3.210.0130.04714.61
5.3.200.0200.03314.48
5.3.190.0070.05314.26
5.3.180.0100.05314.34
5.3.170.0130.04314.58
5.3.160.0030.05314.33
5.3.150.0070.05314.56
5.3.140.0100.04714.45
5.3.130.0100.05314.32
5.3.120.0130.05014.55
5.3.110.0030.07314.24
5.3.100.0030.05313.88
5.3.90.0130.04713.71
5.3.80.0100.05014.17
5.3.70.0030.05314.05
5.3.60.0030.05313.69
5.3.50.0070.05014.04
5.3.40.0000.05713.83
5.3.30.0100.04713.68
5.3.20.0100.04713.40
5.3.10.0070.05013.74
5.3.00.0100.04713.73
5.2.170.0030.04711.14
5.2.160.0130.03311.14
5.2.150.0100.04011.14
5.2.140.0030.04311.15
5.2.130.0030.04011.25
5.2.120.0030.04010.98
5.2.110.0030.05011.19
5.2.100.0000.04310.98
5.2.90.0100.05011.11
5.2.80.0100.03711.10
5.2.70.0100.03710.98
5.2.60.0000.04310.96
5.2.50.0130.03311.11
5.2.40.0100.05010.91
5.2.30.0100.04310.96
5.2.20.0100.05311.05
5.2.10.0100.03311.07
5.2.00.0100.03310.47
5.1.60.0030.0339.76
5.1.50.0030.0339.95
5.1.40.0000.04010.21
5.1.30.0030.03710.41
5.1.20.0030.03710.25
5.1.10.0070.03310.00
5.1.00.0070.0339.98
5.0.50.0070.0278.31
5.0.40.0030.0278.26
5.0.30.0030.0408.12
5.0.20.0030.0278.23
5.0.10.0030.0278.21
5.0.00.0030.0478.11
4.4.90.0030.0206.79
4.4.80.0030.0206.79
4.4.70.0030.0306.79
4.4.60.0000.0236.79
4.4.50.0070.0176.79
4.4.40.0030.0336.79
4.4.30.0030.0236.79
4.4.20.0030.0206.79
4.4.10.0030.0236.79
4.4.00.0030.0476.79
4.3.110.0030.0206.79
4.3.100.0030.0206.79
4.3.90.0070.0176.79
4.3.80.0000.0376.79
4.3.70.0100.0136.79
4.3.60.0070.0176.79
4.3.50.0100.0136.79
4.3.40.0000.0336.79
4.3.30.0000.0236.79
4.3.20.0070.0176.79
4.3.10.0000.0236.79
4.3.00.0100.0276.97

preferences:
51.57 ms | 401 KiB | 5 Q