3v4l.org

run code in 300+ PHP versions simultaneously
<?php $letter = 'a'; $aX = 1; $bX = "bb"; echo $${$letter . "X"};

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)
8.3.60.0120.00916.63
8.3.50.0060.01016.49
8.3.40.0110.00418.70
8.3.30.0140.00018.67
8.3.20.0000.00721.90
8.3.10.0040.00421.84
8.3.00.0040.00419.56
8.2.180.0070.01418.29
8.2.170.0100.00722.96
8.2.160.0120.00320.39
8.2.150.0050.00324.18
8.2.140.0070.00024.66
8.2.130.0070.00020.43
8.2.120.0040.00426.35
8.2.110.0030.00720.38
8.2.100.0130.00017.84
8.2.90.0040.00419.21
8.2.80.0100.00017.97
8.2.70.0000.00817.50
8.2.60.0060.00317.91
8.2.50.0030.00518.10
8.2.40.0060.00320.61
8.2.30.0000.00720.91
8.2.20.0040.00418.06
8.2.10.0000.00818.06
8.2.00.0080.00018.09
8.1.270.0080.00018.88
8.1.260.0000.00826.35
8.1.250.0040.00428.09
8.1.240.0120.00020.84
8.1.230.0000.01119.16
8.1.220.0060.00317.74
8.1.210.0000.00818.77
8.1.200.0060.00617.23
8.1.190.0040.00417.11
8.1.180.0030.00618.10
8.1.170.0040.00418.59
8.1.160.0000.00718.95
8.1.150.0080.00020.59
8.1.140.0000.00819.55
8.1.130.0030.00318.94
8.1.120.0030.00517.46
8.1.110.0000.00717.36
8.1.100.0000.00817.34
8.1.90.0000.00917.48
8.1.80.0000.00717.44
8.1.70.0070.00017.45
8.1.60.0030.00617.65
8.1.50.0040.00417.52
8.1.40.0000.00817.55
8.1.30.0020.00517.58
8.1.20.0030.00617.48
8.1.10.0050.00217.48
8.1.00.0050.00217.41
8.0.300.0040.00418.77
8.0.290.0040.00416.63
8.0.280.0030.00318.45
8.0.270.0000.00717.16
8.0.260.0060.00018.88
8.0.250.0000.00717.00
8.0.240.0060.00317.06
8.0.230.0040.00416.91
8.0.220.0030.00316.92
8.0.210.0040.00416.96
8.0.200.0030.00317.01
8.0.190.0090.00017.00
8.0.180.0070.00016.93
8.0.170.0000.00816.85
8.0.160.0000.00717.03
8.0.150.0000.00816.93
8.0.140.0070.00416.90
8.0.130.0000.00513.44
8.0.120.0000.00816.77
8.0.110.0040.00416.98
8.0.100.0030.00316.94
8.0.90.0030.00516.97
8.0.80.0090.00617.01
8.0.70.0040.00416.84
8.0.60.0000.00716.87
8.0.50.0040.00416.91
8.0.30.0090.00917.10
8.0.20.0120.00717.40
8.0.10.0040.00417.08
8.0.00.0060.01216.72
7.4.330.0020.00216.73
7.4.320.0000.00616.52
7.4.300.0030.00316.52
7.4.290.0000.00816.42
7.4.280.0040.00416.48
7.4.270.0000.01016.41
7.4.260.0020.00516.59
7.4.250.0070.00016.51
7.4.240.0000.00716.53
7.4.230.0070.00016.50
7.4.220.0100.00716.60
7.4.210.0090.01316.60
7.4.200.0000.00716.66
7.4.160.0020.01316.58
7.4.150.0070.01117.40
7.4.140.0140.00717.86
7.4.130.0040.01516.52
7.4.120.0110.01116.50
7.4.110.0070.01016.47
7.4.100.0090.00616.36
7.4.90.0100.00716.48
7.4.80.0060.01019.39
7.4.70.0040.01616.60
7.4.60.0100.00616.53
7.4.50.0120.00316.39
7.4.40.0090.01016.46
7.4.30.0180.00616.32
7.4.10.0030.01316.54
7.4.00.0080.00815.55
7.3.330.0000.00613.22
7.3.320.0000.00713.31
7.3.310.0070.00016.43
7.3.300.0000.00616.29
7.3.290.0050.00916.30
7.3.280.0090.00916.24
7.3.270.0100.01017.40
7.3.260.0140.00316.40
7.3.250.0090.00816.36
7.3.240.0090.00816.34
7.3.230.0090.01416.21
7.3.210.0130.00316.44
7.3.200.0140.00316.32
7.3.190.0070.01016.54
7.3.180.0030.01316.33
7.3.170.0100.00616.35
7.3.160.0040.02016.37
7.3.130.0070.00716.40
7.3.120.0070.00815.62
7.3.110.0050.01415.55
7.3.100.0080.00915.51
7.3.90.0030.01415.46
7.3.80.0040.00615.48
7.3.70.0050.01015.54
7.3.60.0060.01015.44
7.3.50.0020.01215.60
7.3.40.0080.00815.48
7.3.30.0070.00515.56
7.3.20.0040.01017.47
7.3.10.0090.00417.39
7.3.00.0050.00917.26
7.2.330.0070.01716.72
7.2.320.0080.00816.45
7.2.310.0060.01016.45
7.2.300.0120.00916.60
7.2.290.0030.01216.67
7.2.260.0060.00916.67
7.2.250.0140.00515.84
7.2.240.0050.01315.61
7.2.230.0090.00515.79
7.2.220.0050.00915.73
7.2.210.0100.00615.60
7.2.200.0060.01015.81
7.2.190.0080.00815.71
7.2.180.0050.01115.67
7.2.170.0040.01015.62
7.2.160.0030.01016.64
7.2.150.0100.00318.30
7.2.140.0100.00718.34
7.2.130.0040.01218.40
7.2.120.0030.01218.36
7.2.110.0120.00417.36
7.2.100.0000.01118.30
7.2.90.0110.00018.18
7.2.80.0000.01118.30
7.2.70.0100.00318.53
7.2.60.0050.00917.51
7.2.50.0000.01418.55
7.2.40.0000.01018.43
7.2.30.0030.00918.35
7.2.20.0120.00318.33
7.2.10.0040.01118.50
7.2.00.0030.01418.40
7.1.330.0060.01116.40
7.1.320.0070.01016.19
7.1.310.0020.01216.56
7.1.300.0020.01116.38
7.1.290.0080.00816.30
7.1.280.0060.00816.52
7.1.270.0050.01016.41
7.1.260.0070.00716.32
7.1.250.0000.01517.14
7.1.240.0070.00717.34
7.1.230.0000.01117.13
7.1.220.0000.01317.09
7.1.210.0120.00617.11
7.1.200.0050.00916.28
7.1.190.0030.01017.29
7.1.180.0110.00317.25
7.1.170.0070.00717.05
7.1.160.0070.01017.16
7.1.150.0030.01017.24
7.1.140.0000.01617.08
7.1.130.0030.01217.11
7.1.120.0040.01117.10
7.1.110.0070.00717.37
7.1.100.0030.00617.12
7.1.90.0120.00317.15
7.1.80.0000.01417.23
7.1.70.0100.00517.04
7.1.60.0530.00825.20
7.1.50.0550.00624.86
7.1.40.0490.00724.90
7.1.30.0560.00924.77
7.1.20.0620.01324.92
7.1.10.0310.01115.96
7.1.00.0320.00915.87
7.0.330.0090.00316.89
7.0.320.0080.00816.79
7.0.310.0080.00817.04
7.0.300.0040.01216.97
7.0.290.0060.00616.82
7.0.280.0100.00316.94
7.0.270.0040.00717.12
7.0.260.0060.00916.92
7.0.250.0030.01316.94
7.0.240.0120.00316.67
7.0.230.0040.01217.06
7.0.220.0080.00417.14
7.0.210.0090.00416.91
7.0.200.0740.00715.83
7.0.190.0520.01116.02
7.0.180.0580.00815.58
7.0.170.0550.00915.54
7.0.160.0380.01015.60
7.0.150.0390.00715.56
7.0.140.0350.00815.65
7.0.130.0350.01015.81
7.0.120.0540.01015.74
7.0.110.0510.01015.64
7.0.100.0420.00715.68
7.0.90.0330.00915.75
7.0.80.0300.00715.90
7.0.70.0350.01015.77
7.0.60.0360.00515.48
7.0.50.0450.00915.80
7.0.40.0340.00814.90
7.0.30.0300.01214.83
7.0.20.0450.01014.68
7.0.10.0450.01514.70
7.0.00.0320.00914.70
5.6.400.0050.00515.92
5.6.390.0090.00315.76
5.6.380.0090.00915.80
5.6.370.0100.00616.14
5.6.360.0060.00615.76
5.6.350.0100.00716.04
5.6.340.0040.01115.55
5.6.330.0040.01115.85
5.6.320.0030.00915.64
5.6.310.0070.00715.82
5.6.300.0060.01015.77
5.6.290.0040.00815.89
5.6.280.0030.01015.80
5.6.270.0060.00915.87
5.6.260.0060.00615.98
5.6.250.0050.00515.85
5.6.240.0070.00315.91
5.6.230.0000.01515.82
5.6.220.0030.00615.74
5.6.210.0030.00815.87
5.6.200.0000.01315.63
5.6.190.0070.00715.64
5.6.180.0080.00516.12
5.6.170.0000.01715.57
5.6.160.0090.00615.63
5.6.150.0070.00615.69
5.6.140.0000.01315.70
5.6.130.0030.00615.71
5.6.120.0080.00615.84
5.6.110.0040.01115.80
5.6.100.0030.01315.57
5.6.90.0070.00415.93
5.6.80.0100.01015.43
5.6.70.0100.01015.32
5.6.60.0060.00315.69
5.6.50.0090.00915.87
5.6.40.0090.00915.82
5.6.30.0080.00815.88
5.6.20.0030.00615.59
5.6.10.0060.00615.84
5.6.00.0030.00915.66

preferences:
68.5 ms | 400 KiB | 5 Q