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)
8.3.60.0120.00616.63
8.3.50.0090.00616.24
8.3.40.0080.00818.84
8.3.30.0130.00318.57
8.3.20.0040.00421.86
8.3.10.0050.00221.85
8.3.00.0040.00419.66
8.2.180.0070.00718.15
8.2.170.0110.00722.96
8.2.160.0120.00320.38
8.2.150.0080.00024.18
8.2.140.0060.00324.66
8.2.130.0040.00420.52
8.2.120.0000.00826.35
8.2.110.0120.00320.38
8.2.100.0040.00817.84
8.2.90.0080.00019.25
8.2.80.0080.00017.97
8.2.70.0040.00417.63
8.2.60.0030.00618.04
8.2.50.0030.00518.10
8.2.40.0020.00520.60
8.2.30.0040.00421.16
8.2.20.0000.00718.07
8.2.10.0000.00817.99
8.2.00.0040.00418.18
8.1.280.0070.01025.92
8.1.270.0040.00418.88
8.1.260.0070.00026.35
8.1.250.0040.00428.09
8.1.240.0000.01220.89
8.1.230.0070.00419.07
8.1.220.0040.00417.74
8.1.210.0050.00318.77
8.1.200.0030.00717.35
8.1.190.0030.00517.13
8.1.180.0040.00418.10
8.1.170.0000.00818.54
8.1.160.0070.00018.91
8.1.150.0000.00718.92
8.1.140.0030.00619.61
8.1.130.0070.00018.77
8.1.120.0040.00417.44
8.1.110.0080.00017.33
8.1.100.0070.00317.42
8.1.90.0110.00017.35
8.1.80.0030.00317.45
8.1.70.0030.00317.34
8.1.60.0040.00417.62
8.1.50.0060.00317.51
8.1.40.0050.00317.52
8.1.30.0040.00417.63
8.1.20.0050.00317.61
8.1.10.0070.00017.58
8.1.00.0040.00417.43
8.0.300.0080.00018.77
8.0.290.0000.00816.88
8.0.280.0030.00318.48
8.0.270.0030.00317.36
8.0.260.0080.00018.80
8.0.250.0000.00716.89
8.0.240.0040.00416.98
8.0.230.0070.00016.87
8.0.220.0000.00716.96
8.0.210.0040.00417.01
8.0.200.0000.00717.02
8.0.190.0120.00016.88
8.0.180.0000.00716.88
8.0.170.0000.00716.86
8.0.160.0000.00716.93
8.0.150.0030.00616.91
8.0.140.0040.00416.92
8.0.130.0050.00013.39
8.0.120.0040.00416.80
8.0.110.0070.00017.01
8.0.100.0080.00016.94
8.0.90.0040.00416.73
8.0.80.0110.00816.91
8.0.70.0000.00716.82
8.0.60.0070.00016.97
8.0.50.0030.00517.00
8.0.30.0100.00917.05
8.0.20.0120.00717.40
8.0.10.0000.00716.89
8.0.00.0030.01716.71
7.4.330.0000.00516.76
7.4.320.0030.00316.52
7.4.300.0000.00616.51
7.4.290.0000.00716.44
7.4.280.0030.00516.50
7.4.270.0030.00616.39
7.4.260.0000.00716.57
7.4.250.0030.00616.31
7.4.240.0030.00316.64
7.4.230.0070.00016.57
7.4.220.0070.01016.57
7.4.210.0080.00616.61
7.4.200.0070.00016.62
7.4.160.0060.00916.58
7.4.150.0070.01017.40
7.4.140.0070.01417.86
7.4.130.0180.00716.64
7.4.120.0120.00716.42
7.4.110.0070.01016.36
7.4.100.0120.01216.49
7.4.90.0100.00716.59
7.4.80.0090.00919.39
7.4.70.0100.01016.45
7.4.60.0070.00716.52
7.4.50.0070.00716.53
7.4.40.0070.01016.47
7.4.30.0150.00816.56
7.4.00.0070.01015.05
7.3.330.0060.00013.00
7.3.320.0000.00513.05
7.3.310.0030.00316.21
7.3.300.0080.00016.29
7.3.290.0050.01016.26
7.3.280.0070.01116.26
7.3.270.0090.00917.40
7.3.260.0130.00416.38
7.3.250.0100.01016.26
7.3.240.0130.00516.28
7.3.230.0100.00716.43
7.3.210.0070.01016.47
7.3.200.0120.00416.40
7.3.190.0130.00316.45
7.3.180.0070.01016.46
7.3.170.0130.00316.48
7.3.160.0030.01916.59
7.3.00.0090.00616.29
7.2.330.0120.00616.68
7.2.320.0140.00616.77
7.2.310.0030.01316.80
7.2.300.0040.01816.72
7.2.290.0070.01016.41
7.2.130.0090.00616.68
7.2.120.0060.00616.87
7.2.110.0070.01116.95
7.2.100.0060.00616.92
7.2.90.0130.00016.98
7.2.80.0060.00916.98
7.2.70.0040.00816.98
7.2.60.0060.00716.85
7.2.50.0030.01016.82
7.2.40.0030.01016.65
7.2.30.0000.01516.66
7.2.20.0060.00617.18
7.2.10.0060.00616.74
7.2.00.0060.00518.10
7.1.250.0070.00315.74
7.1.240.0040.01115.86
7.1.230.0120.00015.55
7.1.220.0070.00415.83
7.1.210.0000.01115.72
7.1.200.0060.00515.81
7.1.190.0030.00615.78
7.1.180.0060.00315.84
7.1.170.0080.00015.61
7.1.160.0030.00715.50
7.1.150.0030.01315.87
7.1.140.0000.01115.79
7.1.130.0070.00715.34
7.1.120.0090.00615.57
7.1.110.0000.00915.73
7.1.100.0060.00615.79
7.1.90.0000.01315.76
7.1.80.0000.01115.88
7.1.70.0050.00316.39
7.1.60.0370.01524.43
7.1.50.0320.01324.36
7.1.40.0400.00724.03
7.1.30.0470.00824.18
7.1.20.0090.01424.16
7.1.10.0400.01015.13
7.1.00.0470.00315.24
7.0.330.0000.01015.04
7.0.320.0080.00415.30
7.0.310.0040.00815.47
7.0.300.0040.00814.87
7.0.290.0030.00715.32
7.0.280.0130.00315.38
7.0.270.0080.00015.32
7.0.260.0050.00315.13
7.0.250.0000.01115.25
7.0.240.0030.00615.28
7.0.230.0000.01315.47
7.0.220.0000.00715.36
7.0.210.0040.00815.05
7.0.200.0370.00715.07
7.0.190.0340.00715.14
7.0.180.0440.00914.66
7.0.170.0080.00514.87
7.0.160.0060.00814.94
7.0.150.0380.01114.80
7.0.140.0400.01214.78
7.0.130.0350.01114.96
7.0.120.0320.01015.04
7.0.110.0790.00314.82
7.0.100.0320.00514.93
7.0.90.0310.00814.99
7.0.80.0250.01614.85
7.0.70.0380.00514.68
7.0.60.0480.01214.76
7.0.50.0250.01214.87
7.0.40.0470.00513.94
7.0.30.0470.00813.98
7.0.20.0480.01013.78
7.0.10.0470.01014.09
7.0.00.0340.00813.96
5.6.380.0120.00014.19

preferences:
56.69 ms | 400 KiB | 5 Q