3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1, 2); $b = array(&$a); $a[] = $b; var_dump(json_encode($a), JSON_ERROR_SYNTAX); echo json_last_error();

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)
8.3.40.0180.00318.67
8.3.30.0060.00819.09
8.3.20.0070.00020.21
8.3.10.0050.00323.66
8.3.00.0080.00019.38
8.2.170.0070.00722.96
8.2.160.0130.00320.24
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0070.00026.16
8.2.120.0040.00422.14
8.2.110.0030.00621.08
8.2.100.0060.00617.78
8.2.90.0000.01117.78
8.2.80.0030.00517.97
8.2.70.0090.00018.04
8.2.60.0000.00818.05
8.2.50.0000.00818.10
8.2.40.0040.00420.46
8.2.30.0000.00718.17
8.2.20.0040.00417.80
8.2.10.0030.00618.07
8.2.00.0040.00417.64
8.1.270.0080.00022.12
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0060.00323.92
8.1.230.0070.00420.89
8.1.220.0090.00017.79
8.1.210.0050.00320.36
8.1.200.0040.00417.23
8.1.190.0000.00817.23
8.1.180.0030.00618.10
8.1.170.0040.00418.50
8.1.160.0040.00422.16
8.1.150.0000.00818.79
8.1.140.0040.00417.31
8.1.130.0000.00717.45
8.1.120.0030.00417.43
8.1.110.0080.00017.34
8.1.100.0040.00317.36
8.1.90.0000.00717.36
8.1.80.0040.00417.43
8.1.70.0030.00317.33
8.1.60.0030.00617.46
8.1.50.0080.00017.55
8.1.40.0000.00717.41
8.1.30.0080.00017.67
8.1.20.0030.00617.53
8.1.10.0000.00817.54
8.1.00.0000.00717.36
8.0.300.0030.00520.05
8.0.290.0040.00416.63
8.0.280.0030.00318.34
8.0.270.0000.00716.73
8.0.260.0030.00316.88
8.0.250.0040.00416.85
8.0.240.0040.00416.91
8.0.230.0030.00316.91
8.0.220.0000.00716.76
8.0.210.0080.00016.84
8.0.200.0030.00316.98
8.0.190.0050.00216.82
8.0.180.0040.00416.94
8.0.170.0080.00016.93
8.0.160.0000.00716.88
8.0.150.0080.00016.95
8.0.140.0050.00216.72
8.0.130.0100.00013.35
8.0.120.0000.00716.84
8.0.110.0050.00316.78
8.0.100.0000.00716.92
8.0.90.0040.00416.77
8.0.80.0050.01916.79
8.0.70.0000.00716.77
8.0.60.0000.00716.83
8.0.50.0030.00616.72
8.0.30.0090.01117.13
8.0.20.0090.01517.40
8.0.10.0000.00716.80
8.0.00.0100.01016.68
7.4.330.0070.00015.02
7.4.320.0070.00016.47
7.4.300.0060.00016.64
7.4.290.0000.00716.63
7.4.280.0070.00016.41
7.4.270.0030.00316.64
7.4.260.0040.00416.52
7.4.250.0040.00416.56
7.4.240.0070.00016.50
7.4.230.0060.00316.42
7.4.220.0140.00316.66
7.4.210.0080.00716.50
7.4.200.0060.00316.64
7.4.160.0170.00016.41
7.4.150.0070.01417.40
7.4.140.0140.00317.86
7.4.130.0080.00916.40
7.4.120.0110.00616.48
7.4.110.0040.01616.29
7.4.100.0100.00716.41
7.4.90.0000.02016.34
7.4.80.0170.00919.39
7.4.70.0030.01616.39
7.4.60.0140.00316.44
7.4.50.0000.00516.47
7.4.40.0070.01016.38
7.4.30.0030.01316.50
7.4.00.0120.00615.01
7.3.330.0000.00612.93
7.3.320.0030.00313.09
7.3.310.0030.00616.18
7.3.300.0000.00716.10
7.3.290.0080.00816.19
7.3.280.0100.00916.17
7.3.270.0100.01017.40
7.3.260.0060.01116.36
7.3.250.0090.01216.37
7.3.240.0120.00816.13
7.3.230.0060.01216.39
7.3.210.0080.01216.38
7.3.200.0070.01019.39
7.3.190.0100.01016.24
7.3.180.0000.01516.17
7.3.170.0090.00916.27
7.3.160.0060.01016.41
7.2.330.0180.00616.49
7.2.320.0120.00316.38
7.2.310.0090.00816.65
7.2.300.0100.00616.30
7.2.290.0170.00316.59
7.2.00.0000.01419.04
7.1.100.0000.01318.15
7.1.70.0040.00417.21
7.1.60.0090.00919.11
7.1.50.0080.01516.79
7.1.00.0000.07722.36
7.0.200.0040.00416.98
7.0.140.0100.07022.18
7.0.120.0470.04720.23
7.0.110.0330.07720.20
7.0.100.0330.08320.18
7.0.90.0430.08720.29
7.0.80.0400.08320.11
7.0.70.0270.08020.14
7.0.60.0170.04720.21
7.0.50.0200.04320.12
7.0.40.0070.04719.93
7.0.30.0270.03720.02
7.0.20.0100.09020.09
7.0.10.0070.08720.00
7.0.00.0000.05019.92
5.6.280.0030.07321.04
5.6.270.0100.06020.82
5.6.260.0030.05721.01
5.6.250.0100.08320.98
5.6.240.0070.08321.04
5.6.230.0100.07720.82
5.6.220.0170.06720.99
5.6.210.0070.07720.85
5.6.200.0000.05720.95
5.6.190.0070.07721.02
5.6.180.0100.04320.88
5.6.170.0100.06321.02
5.6.160.0100.04320.95
5.6.150.0100.04020.95
5.6.140.0170.05320.77
5.6.130.0030.04320.77
5.6.120.0070.04320.88
5.6.110.0100.05020.73
5.6.100.0100.04020.96
5.6.90.0200.02320.92
5.6.80.0100.07720.16
5.6.70.0170.09020.14
5.6.60.0030.07320.14
5.6.50.0030.04020.25
5.6.40.0070.07020.30
5.6.30.0070.04720.13
5.6.20.0170.05320.13
5.6.10.0030.04020.36
5.6.00.0030.04020.11
5.5.380.0130.04317.66
5.5.370.0030.05017.55
5.5.360.0100.07017.45
5.5.350.0070.08317.51
5.5.340.0070.07718.01
5.5.330.0200.07018.16
5.5.320.0070.07318.09
5.5.310.0070.06717.98
5.5.300.0100.03717.84
5.5.290.0000.04317.89
5.5.280.0100.04317.98
5.5.270.0000.05018.11
5.5.260.0070.03018.14
5.5.250.0070.06717.90
5.5.240.0000.04717.23
5.5.230.0070.04017.39
5.5.220.0100.04317.49
5.5.210.0030.03717.36
5.5.200.0070.03717.51
5.5.190.0070.06017.24
5.5.180.0100.03717.21
5.5.160.0000.04017.11
5.5.150.0030.03717.44
5.5.140.0030.03717.43
5.5.130.0070.03717.11
5.5.120.0000.03317.21
5.5.110.0000.03317.43
5.5.100.0000.04017.37
5.5.90.0070.02717.09
5.5.80.0000.03017.27
5.5.70.0100.04017.27
5.5.60.0000.03017.01
5.5.50.0030.03017.26
5.5.40.0000.03717.34
5.5.30.0000.04017.08
5.5.20.0030.07017.13
5.5.10.0030.04017.24
5.5.00.0130.03317.24
5.4.450.0130.03319.37
5.4.440.0100.03719.52
5.4.430.0030.03319.30
5.4.420.0000.04319.20
5.4.410.0070.06019.13
5.4.400.0100.03319.03
5.4.390.0030.07319.22
5.4.380.0030.04018.95
5.4.370.0030.03319.07
5.4.360.0030.04319.06
5.4.350.0100.06019.11
5.4.340.0130.03318.98
5.4.320.0000.04019.07
5.4.310.0000.04019.04
5.4.300.0070.03719.06
5.4.290.0000.04018.88
5.4.280.0030.03719.06
5.4.270.0000.04018.90
5.4.260.0030.03718.87
5.4.250.0030.04019.21
5.4.240.0070.02719.06
5.4.230.0000.03719.04
5.4.220.0000.03318.89
5.4.210.0070.03718.95
5.4.200.0000.03318.95
5.4.190.0030.04019.22
5.4.180.0030.05718.88
5.4.170.0170.02719.04
5.4.160.0130.03318.93
5.4.150.0130.03319.04
5.4.140.0030.03016.13
5.4.130.0030.03316.47
5.4.120.0030.03716.14
5.4.110.0000.03716.30
5.4.100.0070.06316.32
5.4.90.0030.02716.43
5.4.80.0030.03316.22
5.4.70.0000.04016.35
5.4.60.0030.03316.33
5.4.50.0070.03316.28
5.4.40.0030.03016.33
5.4.30.0100.04316.28
5.4.20.0030.03316.21
5.4.10.0170.02316.10
5.4.00.0070.03015.86
5.3.290.0000.04314.59
5.3.280.0030.03014.65
5.3.270.0070.03314.45
5.3.260.0130.04314.60
5.3.250.0030.03314.39
5.3.240.0070.03314.50
5.3.230.0000.03314.66
5.3.220.0070.03014.45
5.3.210.0100.04314.35
5.3.200.0000.03714.46
5.3.190.0030.03314.59
5.3.180.0030.03314.39
5.3.170.0030.03014.56
5.3.160.0030.03014.66
5.3.150.0000.04014.64
5.3.140.0030.03314.38
5.3.130.0000.03714.56
5.3.120.0070.03014.38
5.3.110.0000.04314.47
5.3.100.0000.05314.13
5.3.90.0030.03013.96
5.3.80.0030.03713.95
5.3.70.0000.03713.86
5.3.60.0030.03714.02
5.3.50.0030.03314.01
5.3.40.0130.06714.00
5.3.30.0000.06713.73
5.3.20.0000.03713.59
5.3.10.0030.05313.54
5.3.00.0030.06713.56
5.2.170.0070.02011.09
5.2.160.0000.03011.08
5.2.150.0030.02311.13
5.2.140.0000.04711.13
5.2.130.0070.02311.04
5.2.120.0030.03311.11
5.2.110.0070.04311.16
5.2.100.0070.05711.03
5.2.90.0070.02010.99
5.2.80.0030.03311.09
5.2.70.0000.02711.25
5.2.60.0070.02711.11
5.2.50.0030.03011.02
5.2.40.0000.03310.94
5.2.30.0070.06710.88
5.2.20.0030.03011.02
5.2.10.0030.02710.98
5.2.00.0100.03710.93
5.1.60.0100.01710.16
5.1.50.0030.0239.92
5.1.40.0070.01710.04
5.1.30.0030.02310.33
5.1.20.0030.02710.34
5.1.10.0030.0239.97
5.1.00.0000.02310.31
5.0.50.0070.0179.74
5.0.40.0000.0209.74
5.0.30.0030.0309.74
5.0.20.0000.0239.74
5.0.10.0000.0309.74
5.0.00.0000.0279.74
4.4.90.0000.0209.74
4.4.80.0000.0309.74
4.4.70.0000.0179.74
4.4.60.0030.0139.74
4.4.50.0000.0179.74
4.4.40.0000.0239.74
4.4.30.0030.0139.74
4.4.20.0030.0139.74
4.4.10.0000.0179.74
4.4.00.0000.0279.74
4.3.110.0030.0139.74
4.3.100.0030.0139.74
4.3.90.0030.0109.74
4.3.80.0000.0239.74
4.3.70.0000.0239.74
4.3.60.0000.0309.74
4.3.50.0030.0109.74
4.3.40.0000.0379.74
4.3.30.0000.0179.74
4.3.20.0000.0179.74
4.3.10.0000.0239.74
4.3.00.0000.0179.74

preferences:
44.16 ms | 400 KiB | 5 Q