3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(-1); function myCheck($in) { return @isset($in); } $var1='Something'; $var2='var1'; echo 'Set:' . isset($$var2); $var2='nope'; echo 'Set:' . isset($$var2); $var2='var1'; echo 'Set:' . myCheck($$var2); $var2='nope'; echo 'Set:' . myCheck($$var2); ?>

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)
8.3.70.0080.00818.55
8.3.60.0120.00616.75
8.3.50.0180.01122.07
8.3.40.0110.00718.61
8.3.30.0100.00318.91
8.3.20.0040.00420.22
8.3.10.0090.00023.70
8.3.00.0030.00819.08
8.2.180.0090.00618.66
8.2.170.0100.00322.96
8.2.160.0210.00020.47
8.2.150.0060.00324.18
8.2.140.0000.00824.66
8.2.130.0000.00726.16
8.2.120.0070.00422.20
8.2.110.0060.00322.16
8.2.100.0090.00317.91
8.2.90.0080.00019.29
8.2.80.0040.00417.97
8.2.70.0040.00417.38
8.2.60.0050.00318.05
8.2.50.0000.00818.07
8.2.40.0080.00017.92
8.2.30.0030.00618.04
8.2.20.0040.00417.63
8.2.10.0030.00517.70
8.2.00.0030.00517.55
8.1.280.0110.00325.92
8.1.270.0050.00323.99
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0030.00623.78
8.1.230.0070.00718.93
8.1.220.0040.00417.74
8.1.210.0030.00518.77
8.1.200.0040.00417.25
8.1.190.0050.00317.43
8.1.180.0030.00518.10
8.1.170.0040.00418.66
8.1.160.0040.00421.97
8.1.150.0070.00018.57
8.1.140.0040.00417.34
8.1.130.0000.00717.89
8.1.120.0040.00417.38
8.1.110.0040.00417.43
8.1.100.0000.01117.33
8.1.90.0040.00417.35
8.1.80.0040.00417.46
8.1.70.0070.00017.32
8.1.60.0080.00017.51
8.1.50.0000.00917.50
8.1.40.0050.00317.55
8.1.30.0000.00817.55
8.1.20.0040.00417.49
8.1.10.0000.00717.52
8.1.00.0070.00317.45
8.0.300.0000.00718.77
8.0.290.0050.00317.01
8.0.280.0000.00718.42
8.0.270.0000.00816.87
8.0.260.0000.00616.82
8.0.250.0060.00016.91
8.0.240.0030.00317.02
8.0.230.0000.00717.01
8.0.220.0050.00216.92
8.0.210.0000.00716.96
8.0.200.0030.00317.04
8.0.190.0030.00616.89
8.0.180.0030.00716.84
8.0.170.0000.00917.00
8.0.160.0030.00317.04
8.0.150.0000.00716.91
8.0.140.0030.00616.86
8.0.130.0000.00613.27
8.0.120.0040.00416.92
8.0.110.0040.00416.85
8.0.100.0000.00716.74
8.0.90.0070.00016.97
8.0.80.0070.00816.97
8.0.70.0050.00216.98
8.0.60.0000.00716.95
8.0.50.0070.00017.00
8.0.30.0120.00717.04
8.0.20.0120.00717.40
8.0.10.0000.00717.08
8.0.00.0100.00716.78
7.4.330.0020.00215.08
7.4.320.0030.00316.58
7.4.300.0030.00316.59
7.4.290.0080.00016.50
7.4.280.0000.00716.50
7.4.270.0050.00316.44
7.4.260.0000.00716.58
7.4.250.0050.00216.45
7.4.240.0030.00316.53
7.4.230.0000.00716.39
7.4.220.0130.00316.62
7.4.210.0040.01116.49
7.4.200.0000.00716.38
7.4.190.0000.00716.60
7.4.160.0100.00716.59
7.4.150.0090.00917.40
7.4.140.0110.01317.86
7.4.130.0070.01016.52
7.4.120.0100.01416.66
7.4.110.0040.01316.46
7.4.100.0130.00816.54
7.4.90.0030.01316.61
7.4.80.0030.01319.39
7.4.70.0000.02016.55
7.4.60.0100.00616.46
7.4.50.0020.00216.71
7.4.40.0000.01222.77
7.4.30.0070.01516.50
7.4.00.0040.01215.12
7.3.330.0000.00513.38
7.3.320.0060.00013.16
7.3.310.0000.00816.41
7.3.300.0030.00316.22
7.3.290.0110.00316.33
7.3.280.0110.00816.31
7.3.270.0080.01017.40
7.3.260.0070.01016.32
7.3.250.0100.00816.39
7.3.240.0180.00416.60
7.3.230.0060.01116.39
7.3.210.0040.01416.63
7.3.200.0030.01519.39
7.3.190.0100.01316.43
7.3.180.0030.01216.52
7.3.170.0060.01116.56
7.3.160.0030.01216.40
7.3.120.0000.01514.94
7.2.330.0060.01116.68
7.2.320.0070.01016.73
7.2.310.0130.00316.47
7.2.300.0130.00316.60
7.2.290.0080.00916.79
7.2.60.0150.00017.04
7.2.00.0060.00919.40
7.1.200.0090.00315.84
7.1.100.0040.00818.03
7.1.70.0000.00817.21
7.1.60.0180.00719.29
7.1.50.0150.01216.84
7.1.00.0030.07722.31
7.0.200.0000.00816.17
7.0.140.0100.06721.97
7.0.60.0000.04721.63
7.0.50.0070.08317.88
7.0.40.0100.07720.20
7.0.30.0170.06320.34
7.0.20.0170.04720.08
7.0.10.0100.08020.19
7.0.00.0030.04720.20
5.6.280.0030.07320.82
5.6.210.0030.08020.77
5.6.200.0030.04018.21
5.6.190.0070.08320.57
5.6.180.0200.04320.48
5.6.170.0230.04320.47
5.6.160.0070.08718.15
5.6.150.0070.08018.15
5.6.140.0070.04718.27
5.6.130.0030.05318.19
5.6.120.0070.06321.04
5.6.110.0100.05721.12
5.6.100.0000.04721.11
5.6.90.0100.08321.14
5.6.80.0100.07020.40
5.5.350.0230.06720.33
5.5.340.0100.07717.97
5.5.330.0100.04320.41
5.5.320.0300.07720.44
5.5.310.0300.07720.25
5.5.300.0100.07718.08
5.5.290.0070.08017.98
5.5.280.0030.04720.62
5.5.270.0070.08720.65
5.5.260.0070.07720.87
5.5.250.0130.07320.71
5.5.240.0400.06720.13
5.4.450.0600.05019.63
5.4.440.0730.07319.61
5.4.430.0730.07319.16
5.4.420.0600.05319.67
5.4.410.0230.04719.18
5.4.400.0730.04719.07
5.4.390.0800.06018.87
5.4.380.0270.05318.53
5.4.370.0170.05718.66
5.4.360.0370.04318.70
5.4.350.0130.06018.47
5.4.340.0170.05018.65
5.4.320.0080.03612.50
5.4.310.0030.04512.50
5.4.300.0090.04912.50
5.4.290.0100.05112.50
5.4.280.0040.03812.39
5.4.270.0040.03912.40
5.4.260.0120.03812.39
5.4.250.0080.03812.40
5.4.240.0080.04312.40
5.4.230.0080.04612.39
5.4.220.0060.04012.39
5.4.210.0100.04112.39
5.4.200.0100.03912.39
5.4.190.0040.04412.39
5.4.180.0070.03612.39
5.4.170.0140.04412.37
5.4.160.0140.04612.37
5.4.150.0110.05012.37
5.4.140.0180.04112.05
5.4.130.0120.05312.04
5.4.120.0160.04312.00
5.4.110.0140.04612.00
5.4.100.0190.04411.99
5.4.90.0220.04511.99
5.4.80.0160.05011.99
5.4.70.0240.04011.99
5.4.60.0220.04411.99
5.4.50.0190.04411.98
5.4.40.0220.03911.97
5.4.30.0190.04411.97
5.4.20.0220.04511.96
5.4.10.0170.04311.97
5.4.00.0150.04211.46
5.3.290.0080.04512.80
5.3.280.0040.04212.71
5.3.270.0240.04412.72
5.3.260.0170.05212.72
5.3.250.0140.05212.72
5.3.240.0160.04812.72
5.3.230.0130.05312.71
5.3.220.0250.04112.68
5.3.210.0190.04712.68
5.3.200.0200.04612.68
5.3.190.0170.04512.68
5.3.180.0180.04812.67
5.3.170.0190.04512.67
5.3.160.0160.04612.67
5.3.150.0210.04412.68
5.3.140.0210.04412.66
5.3.130.0180.04812.66
5.3.120.0170.04612.66
5.3.110.0180.04412.65
5.3.100.0200.04212.12
5.3.90.0130.05612.10
5.3.80.0150.05112.07
5.3.70.0180.04412.07
5.3.60.0140.04812.06
5.3.50.0180.04512.01
5.3.40.0200.04412.01
5.3.30.0180.04711.98
5.3.20.0160.04511.76
5.3.10.0120.04911.72
5.3.00.0200.04511.70
5.2.170.0110.0409.21
5.2.160.0130.0389.21
5.2.150.0150.0349.21
5.2.140.0190.0359.21
5.2.130.0120.0369.17
5.2.120.0090.0399.17
5.2.110.0140.0359.17
5.2.100.0140.0339.18
5.2.90.0140.0349.17
5.2.80.0110.0379.16
5.2.70.0100.0419.15
5.2.60.0100.0389.11
5.2.50.0150.0369.08
5.2.40.0190.0339.06
5.2.30.0130.0379.03
5.2.20.0190.0339.04
5.2.10.0150.0368.94
5.2.00.0130.0368.79
5.1.60.0110.0358.07
5.1.50.0120.0328.07
5.1.40.0140.0298.06
5.1.30.0110.0348.41
5.1.20.0270.0788.44
5.1.10.0170.0318.15
5.1.00.0110.0358.15
5.0.50.0090.0276.63
5.0.40.0130.0216.48
5.0.30.0100.0356.31
5.0.20.0110.0236.27
5.0.10.0110.0216.25
5.0.00.0060.0406.23
4.4.90.0100.0204.78
4.4.80.0090.0204.76
4.4.70.0090.0204.75
4.4.60.0100.0204.75
4.4.50.0080.0204.77
4.4.40.0070.0314.71
4.4.30.0120.0184.76
4.4.20.0100.0204.85
4.4.10.0100.0184.85
4.4.00.0120.0254.76
4.3.110.0080.0194.67
4.3.100.0070.0184.66
4.3.90.0080.0184.64
4.3.80.0080.0314.58
4.3.70.0100.0174.63
4.3.60.0060.0214.63
4.3.50.0080.0214.63
4.3.40.0080.0284.54
4.3.30.0090.0153.30
4.3.20.0060.0193.29
4.3.10.0040.0193.26
4.3.00.0070.0235.99

preferences:
59.18 ms | 401 KiB | 5 Q