3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); $strLengthHalf = round(strlen($string) / 2); for ($i = 0; $i <= $strLengthHalf; $i++) { $substr1 .= $string[$strLength-$i]; $substr2 .= $string[$strLengthHalf - $i]; } return $string = $substr1.$substr2; } var_dump(reverse('12345'));

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)
8.3.60.0170.00318.55
8.3.50.0170.00321.13
8.3.40.0120.00318.96
8.3.30.0110.00419.18
8.3.20.0040.00420.40
8.3.10.0040.00423.68
8.3.00.0050.00319.63
8.2.180.0130.01018.18
8.2.170.0110.00422.96
8.2.160.0070.00720.57
8.2.150.0040.00424.18
8.2.140.0030.00524.66
8.2.130.0040.00426.16
8.2.120.0040.00422.31
8.2.110.0090.00020.52
8.2.100.0090.00318.22
8.2.90.0040.00419.17
8.2.80.0050.00317.97
8.2.70.0040.00417.75
8.2.60.0040.00418.05
8.2.50.0060.00318.07
8.2.40.0040.00418.47
8.2.30.0040.00418.07
8.2.20.0040.00417.82
8.2.10.0040.00418.25
8.2.00.0000.00717.87
8.1.280.0120.00625.92
8.1.270.0080.00023.89
8.1.260.0080.00026.35
8.1.250.0080.00028.09
8.1.240.0060.00323.95
8.1.230.0110.00019.17
8.1.220.0000.00817.79
8.1.210.0050.00318.77
8.1.200.0030.00617.35
8.1.190.0040.00417.35
8.1.180.0040.00418.10
8.1.170.0030.00518.61
8.1.160.0030.00521.90
8.1.150.0040.00418.86
8.1.140.0000.00817.56
8.1.130.0040.00417.81
8.1.120.0040.00417.50
8.1.110.0000.00717.39
8.1.100.0000.00717.43
8.1.90.0030.00417.36
8.1.80.0000.00817.43
8.1.70.0000.00717.41
8.1.60.0080.00317.55
8.1.50.0000.00717.61
8.1.40.0030.00617.61
8.1.30.0000.00817.79
8.1.20.0050.00317.69
8.1.10.0040.00417.57
8.1.00.0070.00017.59
8.0.300.0000.00718.77
8.0.290.0050.00316.88
8.0.280.0030.00618.45
8.0.270.0000.00717.25
8.0.260.0000.00617.29
8.0.250.0030.00317.11
8.0.240.0000.00717.13
8.0.230.0000.00717.10
8.0.220.0040.00417.06
8.0.210.0030.00316.99
8.0.200.0000.00817.10
8.0.190.0040.00417.14
8.0.180.0000.00816.99
8.0.170.0060.00317.03
8.0.160.0000.00717.12
8.0.150.0000.00717.02
8.0.140.0030.00517.04
8.0.130.0030.00313.41
8.0.120.0000.00817.02
8.0.110.0070.00016.93
8.0.100.0000.00816.84
8.0.90.0000.00716.93
8.0.80.0060.01617.08
8.0.70.0070.00016.84
8.0.60.0070.00017.02
8.0.50.0070.00017.07
8.0.30.0110.00817.04
8.0.20.0080.01017.40
8.0.10.0000.00717.08
8.0.00.0110.00916.85
7.4.330.0020.00215.13
7.4.320.0030.00716.51
7.4.300.0040.00416.67
7.4.290.0040.00416.60
7.4.280.0040.00416.59
7.4.270.0000.00716.68
7.4.260.0050.00616.55
7.4.250.0040.00416.68
7.4.240.0040.00416.70
7.4.230.0030.00316.55
7.4.220.0180.00716.50
7.4.210.0110.00316.59
7.4.200.0030.00316.39
7.4.160.0100.00716.61
7.4.150.0110.01417.40
7.4.140.0190.00917.86
7.4.130.0060.01116.61
7.4.120.0110.00616.66
7.4.110.0070.01616.53
7.4.100.0000.01616.63
7.4.90.0080.00816.53
7.4.80.0190.00019.39
7.4.70.0140.00716.58
7.4.60.0160.00716.76
7.4.50.0080.00016.52
7.4.40.0080.00816.80
7.4.30.0070.01116.80
7.4.00.0040.01115.13
7.3.330.0000.00513.48
7.3.320.0060.00013.38
7.3.310.0050.00316.54
7.3.300.0000.00716.45
7.3.290.0080.00716.53
7.3.280.0070.00916.49
7.3.270.0060.01817.40
7.3.260.0060.01216.54
7.3.250.0120.00516.43
7.3.240.0140.00816.70
7.3.230.0080.01316.67
7.3.210.0170.00016.66
7.3.200.0040.01719.39
7.3.190.0060.01216.51
7.3.180.0090.00616.56
7.3.170.0100.01016.66
7.3.160.0130.01016.52
7.3.10.0080.00316.66
7.3.00.0080.00316.52
7.2.330.0060.01216.87
7.2.320.0060.01216.65
7.2.310.0060.00916.74
7.2.300.0130.00916.73
7.2.290.0080.01316.89
7.2.130.0040.01416.63
7.2.120.0060.00616.76
7.2.110.0070.00716.76
7.2.100.0070.00716.96
7.2.90.0030.01017.15
7.2.80.0100.00016.73
7.2.70.0030.01017.04
7.2.60.0120.00017.08
7.2.50.0040.00717.05
7.2.40.0000.01316.75
7.2.30.0000.01516.96
7.2.20.0040.01117.04
7.2.10.0000.01417.05
7.2.00.0060.00418.06
7.1.250.0040.00715.88
7.1.200.0000.00815.73
7.1.100.0000.01318.23
7.1.70.0030.00516.99
7.1.60.0070.01719.11
7.1.50.0030.02117.14
7.1.00.0070.07322.42
7.0.200.0000.00716.83
7.0.140.0030.06722.00
7.0.60.0070.07319.96
7.0.50.0170.07017.88
7.0.40.0030.04720.15
7.0.30.0170.06020.13
7.0.20.0330.07020.08
7.0.10.0030.04720.13
7.0.00.0000.06020.10
5.6.280.0170.05721.13
5.6.210.0030.04720.52
5.6.200.0030.04718.12
5.6.190.0070.06320.58
5.6.180.0130.06020.58
5.6.170.0300.07320.49
5.6.160.0030.06020.57
5.6.150.0070.08318.12
5.6.140.0070.03718.18
5.6.130.0070.04018.27
5.6.120.0030.05021.10
5.6.110.0070.08721.02
5.6.100.0030.04021.11
5.6.90.0070.08321.04
5.6.80.0000.07320.53
5.6.70.4470.03720.36
5.5.350.0170.07720.43
5.5.340.0100.07717.99
5.5.330.0100.07720.41
5.5.320.0270.07720.33
5.5.310.0230.03720.40
5.5.300.0030.04018.03
5.5.290.0170.06317.97
5.5.280.0130.08020.85
5.5.270.0130.03320.89
5.5.260.0030.04020.98
5.5.250.0130.07720.77
5.5.240.0230.05720.04
5.4.450.0670.07719.79
5.4.440.0630.05719.61
5.4.430.0700.08719.48
5.4.420.1200.05319.67
5.4.410.1000.05319.50
5.4.400.0600.07319.31
5.4.390.0830.07718.98
5.4.380.0700.05019.15
5.4.370.0900.06719.27
5.4.360.0800.05719.32
5.4.350.0730.07719.14
5.4.340.0040.05412.02
5.4.320.0090.05312.50
5.4.310.0090.05612.50
5.4.300.0100.05612.50
5.4.290.0060.04712.50
5.4.280.0120.04612.40
5.4.270.0070.04812.40
5.4.260.0080.05012.40
5.4.250.0070.05012.39
5.4.240.0100.04612.40
5.4.230.0110.04612.39
5.4.220.0100.04812.39
5.4.210.0080.04712.39
5.4.200.0150.04212.39
5.4.190.0140.04412.39
5.4.180.0130.04412.39
5.4.170.0080.04912.39
5.4.160.0110.04412.39
5.4.150.0090.04612.39
5.4.140.0080.05212.07
5.4.130.0140.03912.05
5.4.120.0110.05112.02
5.4.110.0110.04912.02
5.4.100.0090.04412.02
5.4.90.0080.03712.02
5.4.80.0060.03812.01
5.4.70.0060.03612.00
5.4.60.0040.03912.01
5.4.50.0040.03912.01
5.4.40.0080.03212.00
5.4.30.0070.04311.99
5.4.20.0050.03911.99
5.4.10.0050.03712.00
5.4.00.0080.03611.49
5.3.290.0060.04712.80
5.3.280.0070.03812.71
5.3.270.0110.03612.72
5.3.260.0060.04312.72
5.3.250.0080.04412.72
5.3.240.0060.03812.71
5.3.230.0100.04312.71
5.3.220.0060.04612.68
5.3.210.0070.04012.68
5.3.200.0030.04112.68
5.3.190.0090.03912.68
5.3.180.0100.04312.67
5.3.170.0040.03812.66
5.3.160.0080.03612.67
5.3.150.0090.04212.67
5.3.140.0060.03912.66
5.3.130.0070.04512.66
5.3.120.0070.03812.65
5.3.110.0060.04012.66
5.3.100.0060.03712.12
5.3.90.0040.03912.11
5.3.80.0080.03512.09
5.3.70.0070.03612.10
5.3.60.0070.04212.08
5.3.50.0090.03612.02
5.3.40.0070.03612.02
5.3.30.0030.03811.98
5.3.20.0060.03611.76
5.3.10.0060.03511.73
5.3.00.0050.03711.71
5.2.170.0030.0329.23
5.2.160.0060.0289.23
5.2.150.0040.0349.23
5.2.140.0070.0429.23
5.2.130.0030.0349.19
5.2.120.0060.0289.19
5.2.110.0050.0309.19
5.2.100.0070.0309.19
5.2.90.0060.0299.20
5.2.80.0040.0319.19
5.2.70.0090.0389.19
5.2.60.0080.0389.15
5.2.50.0070.0349.12
5.2.40.0060.0289.09
5.2.30.0110.0349.06
5.2.20.0070.0279.05
5.2.10.0030.0308.96
5.2.00.0040.0308.82
5.1.60.0070.0258.11
5.1.50.0010.0298.10
5.1.40.0020.0298.08
5.1.30.0030.0278.43
5.1.20.0040.0278.45
5.1.10.0050.0258.18
5.1.00.0050.0258.18
5.0.50.0060.0226.65
5.0.40.0100.0176.52
5.0.30.0030.0346.33
5.0.20.0050.0186.29
5.0.10.0040.0206.28
5.0.00.0100.0276.27
4.4.90.0060.0134.78
4.4.80.0060.0144.75
4.4.70.0040.0154.75
4.4.60.0040.0154.75
4.4.50.0040.0154.77
4.4.40.0040.0264.71
4.4.30.0030.0154.76
4.4.20.0040.0154.84
4.4.10.0070.0134.85
4.4.00.0040.0274.76
4.3.110.0020.0174.67
4.3.100.0040.0144.67
4.3.90.0030.0154.64
4.3.80.0030.0254.58
4.3.70.0020.0164.63
4.3.60.0020.0154.63
4.3.50.0040.0144.63
4.3.40.0030.0244.54
4.3.30.0020.0173.32
4.3.20.0010.0173.29
4.3.10.0040.0143.26
4.3.00.0200.0207.03

preferences:
56.33 ms | 401 KiB | 5 Q