3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = "xyz\n"; $obj = new stdClass(); $obj->var = "abc\n"; $key = 'var'; echo $$key; // Works echo ${$key}; // Works // echo {$$key}; E_ERROR echo "$$key"; // Does not work? Outputs "$var" echo "${$key}"; // Works echo "{$$key}"; // Works echo $obj->var; // Works echo $obj->{$key}; // Works // echo $obj->${key}; E_ERROR echo $obj->$$key; // E_NOTICE Undefined property echo $obj->${$key}; // E_NOTICE Undefined property echo $obj->{$$key}; // E_NOTICE Undefined property echo "$obj->var"; // Works // echo "${obj->var}"; // Syntax error echo "{$obj->var}"; // Works // echo "$obj->$$key"; // Catchable fatal error // echo "$obj->${$key}"; // Catchable fatal error // echo "$obj->{$$key}"; // Catchable fatal error // echo "${obj->$$key}"; // Syntax error // echo "${obj->${$key}}"; // Syntax error // echo "${obj->{$$key}}"; // Syntax 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)
8.4.120.0050.00422.32
8.4.110.0120.00820.54
8.4.100.0110.01018.42
8.4.90.0130.00718.52
8.4.80.0120.00818.83
8.4.70.0120.00718.17
8.4.60.0070.00318.95
8.4.50.0030.00818.80
8.4.40.0130.00718.10
8.4.30.0090.01217.69
8.4.20.0040.01617.70
8.4.10.0040.00417.82
8.3.250.0140.00618.94
8.3.240.0080.00416.73
8.3.230.0120.00816.65
8.3.220.0080.00919.04
8.3.210.0090.00916.98
8.3.200.0060.00316.73
8.3.190.0100.00917.28
8.3.180.0100.00817.25
8.3.170.0120.00620.60
8.3.160.0090.00917.41
8.3.150.0070.01117.16
8.3.140.0050.00316.98
8.3.130.0060.00318.66
8.3.120.0060.00320.81
8.3.110.0060.00320.94
8.3.100.0090.00024.06
8.3.90.0040.00426.77
8.3.80.0000.00917.97
8.3.70.0100.01018.56
8.3.60.0120.00616.73
8.3.50.0130.00922.06
8.3.40.0040.01118.93
8.3.30.0030.01419.12
8.3.20.0070.00020.21
8.3.10.0080.00021.80
8.3.00.0030.00519.68
8.2.290.0110.00520.59
8.2.280.0080.01018.61
8.2.270.0090.00916.64
8.2.260.0000.00818.92
8.2.250.0130.00618.36
8.2.240.0060.00617.18
8.2.230.0060.00622.58
8.2.220.0000.00937.54
8.2.210.0080.00826.77
8.2.200.0040.00416.63
8.2.190.0130.00316.75
8.2.180.0140.00718.41
8.2.170.0030.01222.96
8.2.160.0030.01420.47
8.2.150.0050.00324.18
8.2.140.0040.00424.66
8.2.130.0030.00526.16
8.2.120.0100.00019.18
8.2.110.0030.00620.48
8.2.100.0000.01217.78
8.2.90.0030.00619.21
8.2.80.0080.00017.97
8.2.70.0080.00017.50
8.2.60.0000.00717.80
8.2.50.0060.00318.10
8.2.40.0080.00020.45
8.2.30.0060.00322.23
8.2.20.0000.00817.73
8.2.10.0080.00018.13
8.2.00.0000.00717.75
8.1.330.0070.01221.80
8.1.320.0120.00715.98
8.1.310.0040.00417.01
8.1.300.0050.00518.50
8.1.290.0070.00330.84
8.1.280.0120.00325.92
8.1.270.0040.00421.79
8.1.260.0000.01026.35
8.1.250.0020.00528.09
8.1.240.0030.00622.23
8.1.230.0090.00317.65
8.1.220.0080.00017.74
8.1.210.0030.00518.77
8.1.200.0030.00617.23
8.1.190.0040.00417.22
8.1.180.0040.00418.10
8.1.170.0050.00318.64
8.1.160.0060.00318.91
8.1.150.0000.00820.06
8.1.140.0040.00417.45
8.1.130.0000.00717.88
8.1.120.0070.00017.51
8.1.110.0070.00317.35
8.1.100.0000.00717.41
8.1.90.0000.00717.50
8.1.80.0070.00017.42
8.1.70.0070.00017.43
8.1.60.0050.00317.50
8.1.50.0090.00017.41
8.1.40.0050.00617.40
8.1.30.0030.00517.71
8.1.20.0000.00817.64
8.1.10.0030.00517.57
8.1.00.0050.00217.55
8.0.300.0050.00518.77
8.0.290.0000.00916.63
8.0.280.0070.00018.46
8.0.270.0080.00017.33
8.0.260.0030.00317.18
8.0.250.0030.00316.93
8.0.240.0030.00717.02
8.0.230.0000.00816.96
8.0.220.0040.00416.86
8.0.210.0060.00316.95
8.0.200.0030.00617.04
8.0.190.0040.00416.96
8.0.180.0030.00317.02
8.0.170.0030.00517.02
8.0.160.0000.00817.07
8.0.150.0030.00316.95
8.0.140.0070.00316.82
8.0.130.0030.00313.37
8.0.120.0030.00516.91
8.0.110.0000.00716.88
8.0.100.0000.00716.86
8.0.90.0070.00017.03
8.0.80.0130.00316.91
8.0.70.0040.00516.91
8.0.60.0070.00016.83
8.0.50.0000.00816.93
8.0.30.0130.00817.15
8.0.20.0160.00817.40
8.0.10.0040.00416.93
8.0.00.0070.01316.63
7.4.330.0000.00515.03
7.4.320.0060.00016.50
7.4.300.0030.00316.53
7.4.290.0000.00716.62
7.4.280.0040.00416.67
7.4.270.0000.00616.54
7.4.260.0070.00016.45
7.4.250.0070.00016.56
7.4.240.0030.00416.46
7.4.230.0050.00216.41
7.4.220.0070.01016.55
7.4.210.0090.00616.53
7.4.200.0000.00616.69
7.4.160.0090.00616.63
7.4.150.0120.00617.40
7.4.140.0080.01017.86
7.4.130.0130.00716.52
7.4.120.0080.01016.60
7.4.110.0060.01216.52
7.4.100.0090.00916.59
7.4.90.0110.00716.33
7.4.80.0100.01319.39
7.4.70.0100.00716.39
7.4.60.0080.00816.56
7.4.50.0040.00416.72
7.4.40.0060.01116.40
7.4.30.0080.00816.48
7.4.10.0100.00314.82
7.4.00.0090.00515.08
7.3.330.0050.00313.27
7.3.320.0000.00613.26
7.3.310.0030.00316.40
7.3.300.0060.00016.31
7.3.290.0080.00716.30
7.3.280.0110.00816.29
7.3.270.0140.00317.40
7.3.260.0170.00616.38
7.3.250.0150.00216.49
7.3.240.0080.00816.25
7.3.230.0090.00916.39
7.3.210.0130.00416.42
7.3.200.0030.01319.39
7.3.190.0080.00816.35
7.3.180.0110.00416.31
7.3.170.0130.00316.44
7.3.160.0080.00816.54
7.3.130.0030.01315.14
7.3.120.0100.00714.84
7.3.110.0100.00714.86
7.3.100.0030.01314.86
7.3.90.0040.01214.75
7.3.80.0030.00714.87
7.3.70.0090.00314.93
7.3.60.0030.01214.84
7.3.50.0090.00014.91
7.3.40.0030.01414.93
7.3.30.0080.00014.75
7.3.20.0070.00716.57
7.3.10.0060.00816.68
7.3.00.0070.00816.51
7.2.330.0090.00916.77
7.2.320.0060.01216.88
7.2.310.0000.01616.90
7.2.300.0000.01716.75
7.2.290.0140.00416.57
7.2.260.0000.01714.91
7.2.250.0100.01014.58
7.2.240.0030.01215.04
7.2.230.0110.00615.06
7.2.220.0030.01514.78
7.2.210.0030.00614.77
7.2.200.0120.00615.13
7.2.190.0040.00815.12
7.2.180.0060.01015.04
7.2.170.0120.00315.11
7.2.160.0000.01015.11
7.2.150.0060.00617.08
7.2.140.0030.01216.94
7.2.130.0060.00816.71
7.2.120.0080.00616.76
7.2.110.0140.00416.87
7.2.100.0100.00916.72
7.2.90.0100.00916.95
7.2.80.0090.00616.79
7.2.70.0070.00916.75
7.2.60.0120.00816.86
7.2.50.0070.01216.89
7.2.40.0110.00616.71
7.2.30.0100.00816.75
7.2.20.0060.01116.76
7.2.10.0110.00916.74
7.2.00.0060.01217.02
7.1.330.0080.00315.91
7.1.320.0100.00615.89
7.1.310.0000.01515.91
7.1.300.0130.00315.95
7.1.290.0090.00615.85
7.1.280.0080.00415.54
7.1.270.0030.00915.45
7.1.260.0100.00315.81
7.1.250.0090.00615.67
7.1.240.0060.00915.73
7.1.230.0060.00815.83
7.1.220.0030.00515.79
7.1.210.0030.01015.79
7.1.200.0050.00715.74
7.1.190.0040.01216.02
7.1.180.0100.00315.73
7.1.170.0060.00915.59
7.1.160.0070.00715.70
7.1.150.0030.01215.79
7.1.140.0070.00715.87
7.1.130.0030.00915.84
7.1.120.0070.00716.05
7.1.110.0040.00715.86
7.1.100.0030.00915.93
7.1.90.0090.00615.66
7.1.80.0050.00515.79
7.1.70.0070.01116.35
7.1.60.0050.01217.64
7.1.50.0040.00816.36
7.1.40.0040.01116.01
7.1.30.0070.01016.01
7.1.20.0080.00315.92
7.1.10.0060.00315.68
7.1.00.0060.03819.20
7.0.330.0070.00715.49
7.0.320.0030.00715.53
7.0.310.0060.00315.25
7.0.300.0070.01115.49
7.0.290.0080.00415.51
7.0.280.0070.00715.38
7.0.270.0000.01215.54
7.0.260.0090.00615.62
7.0.250.0030.01015.56
7.0.240.0130.00315.67
7.0.230.0060.00315.59
7.0.220.0080.00315.57
7.0.210.0000.01315.39
7.0.200.0390.00515.15
7.0.190.0090.00615.48
7.0.180.0030.01015.25
7.0.170.0030.01015.59
7.0.160.0040.00415.41
7.0.150.0090.00015.25
7.0.140.0070.01818.88
7.0.130.0030.00615.56
7.0.120.0070.01015.42
7.0.110.0070.00715.27
7.0.100.0100.00315.55
7.0.90.0000.01115.39
7.0.80.0060.00615.38
7.0.70.0030.00615.50
7.0.60.0050.02517.71
7.0.50.0150.03516.55
7.0.40.0100.03716.87
7.0.30.0150.04316.82
7.0.20.0100.02616.87
7.0.10.0110.05516.81
7.0.00.0040.02416.88
5.6.400.0030.00814.42
5.6.390.0100.00313.99
5.6.380.0000.01514.21
5.6.370.0040.00414.51
5.6.360.0000.01614.36
5.6.350.0040.00714.43
5.6.340.0100.00314.47
5.6.330.0040.00414.36
5.6.320.0030.01014.21
5.6.310.0060.00614.31
5.6.300.0060.00614.60
5.6.290.0030.00914.32
5.6.280.0030.04117.74
5.6.270.0040.00414.10
5.6.260.0110.00414.38
5.6.250.0060.00614.13
5.6.240.0000.01414.27
5.6.230.0060.00314.18
5.6.220.0040.00814.30
5.6.210.0070.04117.52
5.6.200.0030.04516.27
5.6.190.0060.02917.49
5.6.180.0250.04317.44
5.6.170.0260.04017.51
5.6.160.0080.04517.41
5.6.150.0030.04616.11
5.6.140.0060.02016.13
5.6.130.0090.04416.25
5.6.120.0030.05017.67
5.6.110.0090.03217.66
5.6.100.0030.04817.71
5.6.90.0030.04217.78
5.6.80.0050.04317.30
5.6.70.0040.01114.48
5.6.60.0000.01514.20
5.6.50.0030.00714.42
5.6.40.0000.01514.23
5.6.30.0070.00714.17
5.6.20.0060.00614.30
5.6.10.0080.00314.50
5.6.00.0000.00814.34
5.5.380.0090.00614.36
5.5.370.0030.00714.12
5.5.360.0070.00714.39
5.5.350.0130.04217.39
5.5.340.0050.02916.20
5.5.330.0110.03817.18
5.5.320.1830.02617.39
5.5.310.0190.04117.15
5.5.300.0020.04815.93
5.5.290.0070.02216.14
5.5.280.0090.03717.61
5.5.270.0060.04617.44
5.5.260.0080.04017.40
5.5.250.0070.03017.43
5.5.240.0200.02817.21
5.5.230.0040.00414.36
5.5.220.0070.00313.99
5.5.210.0060.00614.21
5.5.200.0080.00514.24
5.5.190.0080.00814.32
5.5.180.0030.01014.21
5.5.170.0040.00714.26
5.5.160.0040.01014.40
5.5.150.0090.00613.82
5.5.140.0050.00314.07
5.5.130.0040.00814.07
5.5.120.0080.00414.27
5.5.110.0070.00714.46
5.5.100.0060.00614.36
5.5.90.0060.00614.14
5.5.80.0060.00614.45
5.5.70.0060.00914.15
5.5.60.0040.01114.21
5.5.50.0060.00313.87
5.5.40.0000.01114.37
5.5.30.0000.01414.01
5.5.20.0000.01513.83
5.5.10.0060.00914.24
5.5.00.0090.00614.23
5.4.450.0100.04416.22
5.4.440.0400.03616.25
5.4.430.0100.02916.21
5.4.420.0080.04116.18
5.4.410.0080.02815.98
5.4.400.0060.02816.05
5.4.390.0110.02716.02
5.4.380.0110.02915.79
5.4.370.0100.02015.72
5.4.360.0100.02215.70
5.4.350.0050.02315.71
5.4.340.0070.02315.66
5.4.330.0040.00712.90
5.4.320.0080.02515.65
5.4.310.0120.02115.65
5.4.300.0070.02315.68
5.4.290.0130.02015.75
5.4.280.0100.02015.77
5.4.270.0080.02015.66
5.4.260.0080.02515.68
5.4.250.0050.02915.74
5.4.240.0130.02115.69
5.4.230.0100.02115.77
5.4.220.0120.02015.77
5.4.210.0100.01815.69
5.4.200.0120.01714.64
5.4.190.0080.02115.76
5.4.180.0090.02115.62
5.4.170.0120.01815.73
5.4.160.0090.01915.65
5.4.150.0100.01915.69
5.4.140.0080.02414.58
5.4.130.0070.02014.52
5.4.120.0100.02014.49
5.4.110.0120.02014.54
5.4.100.0080.02414.47
5.4.90.0080.01814.50
5.4.80.0080.02014.50
5.4.70.0110.01814.54
5.4.60.0110.01614.56
5.4.50.0070.02214.56
5.4.40.0080.02314.53
5.4.30.0070.02514.58
5.4.20.0080.02014.43
5.4.10.0170.01714.48
5.4.00.0100.01714.21
5.3.290.0130.04014.58
5.3.280.0130.04014.48
5.3.270.0130.04014.50
5.3.260.0130.04014.63
5.3.250.0070.04014.51
5.3.240.0170.03714.52
5.3.230.0100.04314.46
5.3.220.0170.03314.47
5.3.210.0170.03714.54
5.3.200.0130.04014.43
5.3.190.0100.04014.43
5.3.180.0170.03714.58
5.3.170.0170.04714.46
5.3.160.0170.05014.57
5.3.150.0300.04314.50
5.3.140.0330.04714.49
5.3.130.0130.05714.44
5.3.120.0200.05314.41
5.3.110.0100.05314.40
5.3.100.0270.03014.07
5.3.90.0100.04313.90
5.3.80.0100.04013.88
5.3.70.0070.04713.99
5.3.60.0100.04013.92
5.3.50.0200.04313.88
5.3.40.0100.04313.88
5.3.30.0130.04013.84
5.3.20.0130.03713.59
5.3.10.0130.04713.50
5.3.00.0100.04013.49
5.2.170.0170.02711.06
5.2.160.0130.03311.11
5.2.150.0100.04011.07
5.2.140.0100.03711.05
5.2.130.0130.03011.00
5.2.120.0100.03310.91
5.2.110.0130.04011.19
5.2.100.0130.03711.07
5.2.90.0070.03311.10
5.2.80.0200.03011.19
5.2.70.0130.04011.07
5.2.60.0100.03011.14
5.2.50.0170.02711.11
5.2.40.0070.03711.08
5.2.30.0170.02710.86
5.2.20.0230.02310.93
5.2.10.0100.03010.89
5.2.00.0070.03310.71
5.1.60.0130.0209.90
5.1.50.0030.0309.98
5.1.40.0100.0309.93
5.1.30.0070.03010.34
5.1.20.0030.03010.35
5.1.10.0070.0339.97
5.1.00.0100.02310.14
5.0.50.0000.0238.47
5.0.40.0030.0238.36
5.0.30.0130.0238.15
5.0.20.0200.0208.25
5.0.10.0070.0278.22
5.0.00.0070.0338.14
4.4.90.0070.0175.89
4.4.80.0030.0175.93
4.4.70.0030.0205.81
4.4.60.0000.0205.85
4.4.50.0000.0205.85
4.4.40.0130.0205.87
4.4.30.0000.0205.80
4.4.20.0000.0235.91
4.4.10.0100.0205.90
4.4.00.0070.0305.84
4.3.110.0070.0205.78
4.3.100.0000.0205.77
4.3.90.0070.0235.75
4.3.80.0000.0375.88
4.3.70.0070.0175.74
4.3.60.0070.0235.85
4.3.50.0130.0175.75
4.3.40.0030.0335.78
4.3.30.0070.0204.53
4.3.20.0070.0174.48
4.3.10.0030.0234.44
4.3.00.0030.0206.79

preferences:
34.41 ms | 403 KiB | 5 Q