3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = true; $b = $a; var_dump(is_ref($a, $b)); function is_ref(&$a, &$b) { if ($a !== $b) return false; // create a unique different value $differentValue = ($a === true) ? false : true; // We need a copy of $a, to keep safe. Note that if $a is a "referenced" value, $copy will be too. $copy = $a; // Change $a and check if $b changed too, finally restore $a using $copy. $a = $differentValue; $same = $a === $b; $a = $copy; return $same; }

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)
8.3.60.0090.00616.50
8.3.50.0100.01222.76
8.3.40.0040.01118.81
8.3.30.0140.00018.79
8.3.20.0050.00320.33
8.3.10.0080.00021.78
8.3.00.0060.00319.38
8.2.180.0130.00916.75
8.2.170.0070.00722.96
8.2.160.0070.00720.35
8.2.150.0050.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0050.00321.04
8.2.110.0100.00020.54
8.2.100.0000.01217.59
8.2.90.0060.00319.09
8.2.80.0000.00817.97
8.2.70.0040.00817.50
8.2.60.0080.00017.93
8.2.50.0040.00418.07
8.2.40.0040.00418.03
8.2.30.0000.00717.86
8.2.20.0000.00817.59
8.2.10.0030.00517.93
8.2.00.0080.00017.55
8.1.280.0130.00325.92
8.1.270.0040.00423.81
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0000.00923.83
8.1.230.0080.00423.88
8.1.220.0000.00818.77
8.1.210.0030.00718.92
8.1.200.0030.00617.23
8.1.190.0040.00417.10
8.1.180.0050.00319.01
8.1.170.0100.00318.36
8.1.160.0040.00421.95
8.1.150.0040.00418.83
8.1.140.0040.00417.25
8.1.130.0030.00317.75
8.1.120.0000.00717.43
8.1.110.0040.00417.40
8.1.100.0000.00817.36
8.1.90.0000.00717.38
8.1.80.0000.00717.45
8.1.70.0030.00517.38
8.1.60.0060.00317.59
8.1.50.0000.00817.55
8.1.40.0030.00617.49
8.1.30.0070.00317.70
8.1.20.0000.00717.52
8.1.10.0040.00417.39
8.1.00.0030.00617.40
8.0.300.0050.00219.91
8.0.290.0000.00716.63
8.0.280.0030.00318.29
8.0.270.0070.00017.13
8.0.260.0040.00417.20
8.0.250.0030.00316.80
8.0.240.0030.00316.84
8.0.230.0030.00716.82
8.0.220.0030.00316.73
8.0.210.0000.00716.87
8.0.200.0030.00316.93
8.0.190.0040.00416.87
8.0.180.0070.00016.83
8.0.170.0040.00416.79
8.0.160.0020.00516.89
8.0.150.0030.00816.82
8.0.140.0100.00016.70
8.0.130.0060.00013.30
8.0.120.0040.00416.67
8.0.110.0000.00716.82
8.0.100.0030.00316.69
8.0.90.0040.00416.72
8.0.80.0090.00916.86
8.0.70.0000.00716.69
8.0.60.0000.00716.88
8.0.50.0030.00316.71
8.0.30.0100.00816.92
8.0.20.0120.01017.40
8.0.10.0040.00416.75
8.0.00.0100.00816.79
7.4.330.0000.00515.05
7.4.320.0040.00416.65
7.4.300.0040.00416.54
7.4.290.0070.00016.57
7.4.280.0040.00416.59
7.4.270.0040.00416.62
7.4.260.0000.00816.50
7.4.250.0040.00416.57
7.4.240.0020.00516.58
7.4.230.0030.00316.41
7.4.220.0060.00916.45
7.4.210.0040.01116.69
7.4.200.0080.00016.64
7.4.160.0030.01316.38
7.4.150.0100.00717.40
7.4.140.0100.00717.86
7.4.130.0070.01016.44
7.4.120.0090.01116.49
7.4.110.0000.01816.46
7.4.100.0040.01616.42
7.4.90.0130.00416.54
7.4.80.0070.01019.39
7.4.70.0100.01016.48
7.4.60.0170.00716.54
7.4.50.0000.00416.31
7.4.40.0100.00616.37
7.4.30.0120.00316.22
7.4.00.0030.01215.00
7.3.330.0000.00613.23
7.3.320.0000.00513.07
7.3.310.0030.00316.21
7.3.300.0040.00416.18
7.3.290.0040.01516.27
7.3.280.0040.01216.29
7.3.270.0030.01317.40
7.3.260.0100.00716.38
7.3.250.0100.00816.33
7.3.240.0090.00816.30
7.3.230.0090.00616.39
7.3.210.0070.01116.48
7.3.200.0030.01419.39
7.3.190.0040.01216.51
7.3.180.0140.00316.39
7.3.170.0070.00716.50
7.3.160.0060.01016.62
7.3.10.0070.00516.11
7.3.00.0070.00716.36
7.2.330.0090.00916.60
7.2.320.0160.00616.40
7.2.310.0060.01216.24
7.2.300.0100.01316.63
7.2.290.0030.01316.38
7.2.130.0020.01016.62
7.2.120.0050.00916.64
7.2.110.0070.00416.58
7.2.100.0040.01016.72
7.2.90.0060.00716.54
7.2.80.0080.00516.62
7.2.70.0020.01016.68
7.2.60.0090.00316.56
7.2.50.0080.00416.47
7.2.40.0060.00716.87
7.2.30.0060.00916.83
7.2.20.0070.00416.62
7.2.10.0060.00516.70
7.2.00.0040.01017.59
7.1.250.0040.00815.63
7.1.100.0070.00718.34
7.1.70.0080.00017.16
7.1.60.0100.01419.40
7.1.50.0100.01316.82
7.1.00.0030.07722.27
7.0.200.0030.00316.41
7.0.140.0100.06722.00
7.0.60.0200.04720.04
7.0.50.0000.04717.86
7.0.40.0100.08320.26
7.0.30.0200.04720.24
7.0.20.0130.04320.10
7.0.10.0070.05720.10
7.0.00.0030.05020.09
5.6.280.0070.07021.03
5.6.210.0170.07320.57
5.6.200.0100.08018.14
5.6.190.0100.05320.46
5.6.180.3970.04320.64
5.6.170.0300.07320.45
5.6.160.0070.04320.48
5.6.150.0130.07718.22
5.6.140.0000.05718.20
5.6.130.0030.08318.16
5.6.120.0070.07021.05
5.6.110.0170.07721.00
5.6.100.0300.06321.03
5.6.90.0100.06721.13
5.6.80.0000.05020.51
5.6.70.4130.03720.36
5.5.350.0230.07020.35
5.5.340.0130.07317.95
5.5.330.0170.07720.21
5.5.320.4030.03720.35
5.5.310.0200.05720.26
5.5.300.0100.08017.92
5.5.290.0030.06718.08
5.5.280.0030.05720.97
5.5.270.0070.04320.84
5.5.260.0130.07720.79
5.5.250.0100.07720.58
5.5.240.0200.08020.27
5.4.450.0400.05019.47
5.4.440.0200.04319.49
5.4.430.0270.04719.41
5.4.420.0330.04019.27
5.4.410.0400.04319.34
5.4.400.0230.03718.85
5.4.390.0170.03718.95
5.4.380.0670.06018.74
5.4.370.1130.04718.68
5.4.360.0670.05018.53
5.4.350.0700.05318.78
5.4.340.0870.05018.67
5.4.320.0060.03712.50
5.4.310.0090.04212.50
5.4.300.0050.03912.51
5.4.290.0070.03712.50
5.4.280.0070.03912.40
5.4.270.0090.03212.40
5.4.260.0080.04312.40
5.4.250.0030.04012.39
5.4.240.0050.03712.40
5.4.230.0050.03812.39
5.4.220.0060.03612.39
5.4.210.0090.04212.39
5.4.200.0080.04012.39
5.4.190.0040.04612.39
5.4.180.0070.03812.39
5.4.170.0090.04212.39
5.4.160.0090.03412.39
5.4.150.0070.03912.38
5.4.140.0030.04112.07
5.4.130.0090.03912.06
5.4.120.0030.04412.02
5.4.110.0080.04012.01
5.4.100.0160.04112.01
5.4.90.0060.04712.01
5.4.80.0070.04712.01
5.4.70.0050.03812.01
5.4.60.0080.03312.01
5.4.50.0060.03612.01
5.4.40.0070.04412.00
5.4.30.0080.04812.00
5.4.20.0040.04411.99
5.4.10.0110.04012.00
5.4.00.0070.04211.48
5.3.290.0030.04212.80
5.3.280.0080.04112.70
5.3.270.0080.04812.73
5.3.260.0070.04212.72
5.3.250.0050.03812.72
5.3.240.0070.05012.72
5.3.230.0120.03512.71
5.3.220.0060.04012.68
5.3.210.0090.03912.68
5.3.200.0030.03912.68
5.3.190.0050.03912.68
5.3.180.0100.03312.68
5.3.170.0070.03512.67
5.3.160.0050.04712.68
5.3.150.0070.04312.67
5.3.140.0120.05012.66
5.3.130.0070.04012.65
5.3.120.0070.04012.65
5.3.110.0050.04412.66
5.3.100.0100.04512.12
5.3.90.0060.04512.11
5.3.80.0070.04412.09
5.3.70.0090.04312.09
5.3.60.0050.04212.07
5.3.50.0080.03412.02
5.3.40.0060.03812.02
5.3.30.0040.03911.98
5.3.20.0070.03711.76
5.3.10.0090.03811.73
5.3.00.0080.04011.71
5.2.170.0050.0349.21
5.2.160.0070.0369.22
5.2.150.0040.0339.21
5.2.140.0040.0389.21
5.2.130.0100.0269.17
5.2.120.0030.0299.17
5.2.110.0030.0309.18
5.2.100.0050.0289.17
5.2.90.0050.0299.17
5.2.80.0080.0359.17
5.2.70.0030.0349.17
5.2.60.0050.0359.13
5.2.50.0010.0409.09
5.2.40.0030.0319.07
5.2.30.0030.0319.04
5.2.20.0030.0319.03
5.2.10.0060.0278.94
5.2.00.0050.0318.80
5.1.60.0020.0278.09
5.1.50.0050.0278.08
5.1.40.0060.0248.06
5.1.30.0030.0298.42
5.1.20.0070.0248.43
5.1.10.0080.0218.16
5.1.00.0050.0258.16
5.0.50.0050.0196.64
5.0.40.0020.0206.50
5.0.30.0020.0336.31
5.0.20.0030.0226.28
5.0.10.0060.0186.25
5.0.00.0090.0266.25
4.4.90.0060.0124.77
4.4.80.0030.0174.76
4.4.70.0040.0164.75
4.4.60.0020.0174.75
4.4.50.0020.0184.77
4.4.40.0030.0254.71
4.4.30.0040.0174.76
4.4.20.0010.0184.85
4.4.10.0040.0204.85
4.4.00.0050.0244.76
4.3.110.0040.0144.67
4.3.100.0060.0114.66
4.3.90.0030.0144.63
4.3.80.0040.0244.59
4.3.70.0040.0164.63
4.3.60.0020.0174.63
4.3.50.0030.0154.63
4.3.40.0020.0254.54
4.3.30.0030.0163.30
4.3.20.0030.0173.28
4.3.10.0020.0193.24
4.3.00.0070.01715.91

preferences:
40.03 ms | 401 KiB | 5 Q