3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "abcd"; $len = strlen($str); $pos = floor($len/2); for($i = $len; $i > $pos; $i--) { echo ord($str[$pos+$i]).">>>".ord($str[$pos-$i])."\n"; }

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)
8.3.40.0110.00318.80
8.3.30.0120.00319.04
8.3.20.0000.00820.12
8.3.10.0070.00021.94
8.3.00.0040.00419.12
8.2.170.0000.01522.96
8.2.160.0070.00720.57
8.2.150.0040.00424.18
8.2.140.0050.00324.66
8.2.130.0040.00426.16
8.2.120.0040.00420.88
8.2.110.0030.00620.22
8.2.100.0110.00017.85
8.2.90.0000.00818.34
8.2.80.0000.00817.97
8.2.70.0040.00417.63
8.2.60.0040.00417.93
8.2.50.0060.00318.07
8.2.40.0090.00018.35
8.2.30.0050.00318.18
8.2.20.0030.00817.74
8.2.10.0000.00718.13
8.2.00.0000.00717.73
8.1.270.0040.00423.82
8.1.260.0050.00326.35
8.1.250.0000.00828.09
8.1.240.0040.00422.14
8.1.230.0070.00320.88
8.1.220.0060.00317.76
8.1.210.0000.00819.03
8.1.200.0030.00617.35
8.1.190.0030.00719.01
8.1.180.0040.00418.10
8.1.170.0040.00818.70
8.1.160.0000.00818.86
8.1.150.0030.00518.92
8.1.140.0060.00317.45
8.1.130.0030.00317.73
8.1.120.0000.00717.39
8.1.110.0000.00717.52
8.1.100.0030.00317.28
8.1.90.0040.00417.38
8.1.80.0030.00317.45
8.1.70.0030.00317.41
8.1.60.0050.00317.59
8.1.50.0050.00317.51
8.1.40.0030.00617.51
8.1.30.0040.00417.61
8.1.20.0040.00417.60
8.1.10.0030.00717.59
8.1.00.0060.00317.48
8.0.300.0040.00420.02
8.0.290.0000.00717.05
8.0.280.0000.00818.45
8.0.270.0040.00417.30
8.0.260.0030.00317.25
8.0.250.0000.00717.00
8.0.240.0040.00416.98
8.0.230.0000.00717.02
8.0.220.0090.00016.94
8.0.210.0030.00316.95
8.0.200.0040.00416.97
8.0.190.0040.00417.02
8.0.180.0070.00016.89
8.0.170.0000.00816.92
8.0.160.0030.00317.09
8.0.150.0000.00716.80
8.0.140.0000.00916.91
8.0.130.0030.00313.31
8.0.120.0050.00316.81
8.0.110.0040.00416.81
8.0.100.0040.00416.94
8.0.90.0040.00416.81
8.0.80.0030.01317.01
8.0.70.0000.00716.98
8.0.60.0070.00016.90
8.0.50.0000.00816.91
8.0.30.0120.00717.04
8.0.20.0130.00817.40
8.0.10.0000.00716.95
8.0.00.0130.00716.94
7.4.330.0020.00215.03
7.4.320.0070.00016.60
7.4.300.0060.00016.57
7.4.290.0000.00716.44
7.4.280.0050.00316.49
7.4.270.0040.00416.48
7.4.260.0000.00916.50
7.4.250.0050.00216.44
7.4.240.0040.00316.65
7.4.230.0030.00316.58
7.4.220.0160.01016.34
7.4.210.0070.01016.50
7.4.200.0000.00716.48
7.4.160.0070.01016.41
7.4.150.0000.01817.40
7.4.140.0090.01317.86
7.4.130.0120.00616.54
7.4.120.0100.00616.46
7.4.110.0150.00916.36
7.4.100.0130.00516.45
7.4.90.0080.00816.42
7.4.80.0090.00919.39
7.4.70.0070.01116.39
7.4.60.0100.00616.62
7.4.50.0030.00616.62
7.4.40.0100.01016.50
7.4.30.0080.00816.62
7.4.00.0100.00615.08
7.3.330.0000.00513.32
7.3.320.0000.00513.31
7.3.310.0050.00216.29
7.3.300.0000.00716.41
7.3.290.0030.01016.36
7.3.280.0090.00816.41
7.3.270.0090.00917.40
7.3.260.0090.00916.42
7.3.250.0140.00416.49
7.3.240.0060.01316.60
7.3.230.0230.00016.46
7.3.210.0130.00416.61
7.3.200.0180.01019.39
7.3.190.0090.00616.61
7.3.180.0160.00016.48
7.3.170.0000.01616.27
7.3.160.0000.01516.64
7.3.120.0060.01214.80
7.3.110.0100.00714.91
7.3.100.0100.00315.11
7.3.90.0030.01014.92
7.3.80.0080.00814.86
7.3.70.0090.00314.73
7.3.60.0060.00914.93
7.3.50.0120.00014.84
7.3.40.0030.01214.97
7.3.30.0090.00614.83
7.3.20.0060.00316.75
7.3.10.0090.00416.63
7.3.00.0090.00616.74
7.2.330.0120.00616.70
7.2.320.0100.01016.70
7.2.310.0230.00016.76
7.2.300.0060.01016.52
7.2.290.0090.00916.43
7.2.250.0100.00715.00
7.2.240.0070.01314.60
7.2.230.0060.00915.22
7.2.220.0030.00814.86
7.2.210.0060.00915.22
7.2.200.0060.00915.13
7.2.190.0060.00615.04
7.2.180.0040.00814.89
7.2.170.0060.00914.86
7.2.130.0060.00916.87
7.2.120.0090.00516.76
7.2.110.0050.00916.73
7.2.100.0040.01016.91
7.2.90.0100.00816.77
7.2.80.0100.00916.83
7.2.70.0160.00516.81
7.2.60.0080.00816.77
7.2.50.0100.00716.63
7.2.40.0100.00816.76
7.2.30.0100.01016.82
7.2.20.0100.00716.79
7.2.10.0130.00616.72
7.2.00.0090.00817.61
7.1.330.0130.00015.52
7.1.320.0000.01216.05
7.1.310.0060.00315.97
7.1.300.0000.01315.95
7.1.290.0030.00615.60
7.1.280.0120.00315.43
7.1.270.0030.01015.65
7.1.260.0030.00715.64
7.1.250.0120.00215.70
7.1.200.0060.00615.86
7.1.100.0030.01017.86
7.1.70.0070.01017.15
7.1.60.0030.02119.57
7.1.50.0090.01217.06
7.1.00.0030.07722.45
7.0.200.0070.00416.85
7.0.140.0000.03322.00
7.0.60.0030.05719.91
7.0.50.0000.04717.75
7.0.40.0000.05019.90
7.0.30.0270.03320.00
7.0.20.0170.07320.20
7.0.10.0170.07720.30
7.0.00.0030.04720.21
5.6.280.0030.07321.07
5.6.210.0000.04320.50
5.6.200.0130.07718.16
5.6.190.0000.04720.35
5.6.180.0330.04020.39
5.6.170.0230.08320.62
5.6.160.0000.05020.45
5.6.150.0130.04018.12
5.6.140.0030.08318.21
5.6.130.0100.03718.11
5.6.120.0030.04020.98
5.6.110.0200.07020.98
5.6.100.0030.06721.07
5.6.90.0100.04720.96
5.6.80.0300.05720.52
5.5.350.0300.07320.37
5.5.340.0100.07317.92
5.5.330.0070.03720.46
5.5.320.0230.06320.28
5.5.310.0300.04720.20
5.5.300.0070.05717.88
5.5.290.0070.05717.91
5.5.280.0030.04320.80
5.5.270.0070.04720.78
5.5.260.0030.04320.83
5.5.250.0130.04020.71
5.5.240.0030.07720.11
5.4.450.0870.05019.49
5.4.440.0170.06019.58
5.4.430.0100.05319.63
5.4.420.0130.05019.62
5.4.410.0130.05019.32
5.4.400.0130.04719.02
5.4.390.0100.05319.16
5.4.380.0100.05318.96
5.4.370.0100.05718.49
5.4.360.0170.04718.60
5.4.350.0370.05018.50
5.4.340.0170.05018.79
5.4.320.0200.05018.62
5.4.310.0200.05718.67
5.4.300.0170.05318.49
5.4.290.0100.05318.65
5.4.280.0230.04318.68
5.4.270.0130.05318.68
5.4.260.0100.05718.64
5.4.250.0170.05318.50
5.4.240.0100.06018.60
5.4.230.0130.05318.45
5.4.220.0200.07018.48
5.4.210.0200.05718.66
5.4.200.0200.04716.61
5.4.190.0170.05318.55
5.4.180.0200.05018.58
5.4.170.0070.06018.67
5.4.160.0070.05718.56
5.4.150.0070.06318.46
5.4.140.0130.05016.32
5.4.130.0130.04716.20
5.4.120.0070.05716.17
5.4.110.0200.05716.14
5.4.100.0070.07316.17
5.4.90.0170.04716.14
5.4.80.0100.05316.15
5.4.70.0100.05316.00
5.4.60.0170.04716.26
5.4.50.0170.04316.23
5.4.40.0170.05716.03
5.4.30.0070.05716.13
5.4.20.0230.04316.18
5.4.10.0230.04016.26
5.4.00.0130.05015.58
5.3.290.0170.04714.76
5.3.280.0070.06314.68
5.3.270.0130.05314.58
5.3.260.0200.04714.51
5.3.250.0200.04714.51
5.3.240.0130.05714.61
5.3.230.0100.05314.49
5.3.220.0200.04714.59
5.3.210.0130.05014.47
5.3.200.0170.04714.46
5.3.190.0130.04714.47
5.3.180.0030.06714.54
5.3.170.0170.05014.46
5.3.160.0170.04714.49
5.3.150.0130.05314.59
5.3.140.0170.04314.56
5.3.130.0170.05014.63
5.3.120.0100.05714.57
5.3.110.0130.05314.46
5.3.100.0130.05714.11
5.3.90.0100.05314.12
5.3.80.0200.04013.93
5.3.70.0000.06314.00
5.3.60.0070.05313.97
5.3.50.0170.04713.93
5.3.40.0130.05013.86
5.3.30.0030.05713.81
5.3.20.0130.05013.60
5.3.10.0200.04313.75
5.3.00.0130.05013.73
5.2.170.0130.04011.18
5.2.160.0070.04311.07
5.2.150.0070.04711.11
5.2.140.0030.04711.10
5.2.130.0130.03711.08
5.2.120.0100.04011.16
5.2.110.0100.03711.26
5.2.100.0030.04311.06
5.2.90.0070.04011.06
5.2.80.0170.05311.25
5.2.70.0130.03711.13
5.2.60.0130.04010.95
5.2.50.0030.04711.07
5.2.40.0070.04711.00
5.2.30.0130.04011.02
5.2.20.0130.03710.88
5.2.10.0070.04010.93
5.2.00.0100.03710.81
5.1.60.0130.03010.01
5.1.50.0100.03310.02
5.1.40.0170.03010.10
5.1.30.0130.03010.53
5.1.20.0070.05310.55
5.1.10.0030.05310.20
5.1.00.0070.05310.11
5.0.50.0030.0379.46
5.0.40.0070.0309.46
5.0.30.0100.0409.46
5.0.20.0100.0239.46
5.0.10.0030.0309.46
5.0.00.0070.0409.46
4.4.90.0070.0209.46
4.4.80.0070.0209.46
4.4.70.0070.0209.46
4.4.60.0070.0209.46
4.4.50.0030.0239.46
4.4.40.0100.0309.46
4.4.30.0070.0209.46
4.4.20.0000.0279.46
4.4.10.0030.0239.46
4.4.00.0000.0409.46
4.3.110.0070.0239.46
4.3.100.0000.0279.46
4.3.90.0030.0239.46
4.3.80.0070.0309.46
4.3.70.0030.0239.46
4.3.60.0000.0279.46
4.3.50.0000.0279.46
4.3.40.0000.0379.46
4.3.30.0030.0209.46
4.3.20.0070.0209.46
4.3.10.0070.0179.46
4.3.00.0100.0207.02

preferences:
47.86 ms | 400 KiB | 5 Q