3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var1 = 'Hello World'; $var2 = ''; $var2 =& $var1; debug_zval_dump(&$var1);

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)
8.0.10.0140.00616.73
8.0.00.0060.01316.83
7.4.140.0050.01316.27
7.4.130.0080.01116.42
7.4.120.0100.01016.36
7.4.110.0120.00716.29
7.4.100.0100.01016.22
7.4.90.0100.00816.33
7.4.80.0110.00916.31
7.4.70.0100.00816.34
7.4.60.0100.00816.30
7.4.50.0100.01016.32
7.4.40.0090.01016.26
7.4.30.0090.00916.30
7.4.20.0080.01016.31
7.4.10.0100.00916.16
7.4.00.0090.00916.00
7.3.260.0110.00716.40
7.3.250.0090.00816.13
7.3.240.0100.00816.25
7.3.230.0080.00916.26
7.3.220.0050.01316.16
7.3.210.0100.01016.19
7.3.200.0080.01016.27
7.3.190.0080.01016.20
7.3.180.0100.01016.25
7.3.170.0110.01016.33
7.3.160.0080.01116.12
7.3.150.0130.00616.23
7.3.140.0110.00716.10
7.3.130.0100.00816.26
7.3.120.0110.00715.74
7.3.110.0080.01115.79
7.3.100.0130.00615.74
7.3.90.0080.01015.77
7.3.80.0110.00815.72
7.3.70.0080.00915.71
7.3.60.0070.01015.78
7.3.50.0090.00915.71
7.3.40.0090.00915.56
7.3.30.0090.00815.72
7.3.20.0150.00815.99
7.3.10.0110.00615.85
7.3.00.0090.00815.94
7.2.340.0160.00916.29
7.2.330.0180.00616.26
7.2.320.0140.01016.33
7.2.310.0160.00716.28
7.2.300.0160.00916.26
7.2.290.0130.00916.25
7.2.280.0170.00816.28
7.2.270.0150.00916.33
7.2.260.0150.00816.33
7.2.250.0130.01016.03
7.2.240.0130.00715.78
7.2.230.0120.00815.93
7.2.220.0140.00815.87
7.2.210.0150.00815.99
7.2.200.0120.01115.88
7.2.190.0130.01015.86
7.2.180.0120.00915.87
7.2.170.0100.01115.86
7.2.160.0110.01015.89
7.2.150.0150.00916.16
7.2.140.0200.00916.13
7.2.130.0110.01116.24
7.2.120.0230.00816.16
7.2.110.0140.00916.18
7.2.100.0180.01016.12
7.2.90.0130.00916.17
7.2.80.0140.00816.15
7.2.70.0150.00716.25
7.2.60.0150.00716.20
7.2.50.0170.00716.17
7.2.40.0160.00816.24
7.2.30.0130.01116.18
7.2.20.0130.01016.12
7.2.10.0160.00816.13
7.2.00.0490.01115.87
7.1.330.0150.01015.23
7.1.320.0160.00815.13
7.1.310.0170.00915.19
7.1.300.0180.00615.11
7.1.290.0210.00615.06
7.1.280.0190.00515.06
7.1.270.0230.00515.12
7.1.260.0300.00815.02
7.1.250.0150.01015.07
7.1.240.0140.01114.99
7.1.230.0170.01015.00
7.1.220.0220.01015.00
7.1.210.0240.01015.02
7.1.200.0170.00815.11
7.1.190.0330.00815.06
7.1.180.0210.00615.10
7.1.170.0230.00915.05
7.1.160.0190.00815.05
7.1.150.0640.01114.87
7.1.140.0210.01115.09
7.1.130.0190.01014.94
7.1.120.0180.00915.10
7.1.110.0360.00615.08
7.1.100.0190.00815.06
7.1.90.0200.01015.13
7.1.80.0240.00915.04
7.1.70.0220.00915.08
7.1.60.0200.01215.11
7.1.50.0210.00715.07
7.1.40.0190.00915.08
7.1.30.0210.00815.12
7.1.20.0190.01315.14
7.1.10.0190.00915.12
7.1.00.0170.01015.19
7.0.330.0170.00914.78
7.0.320.0260.00814.81
7.0.310.0170.00914.81
7.0.300.0170.01014.86
7.0.290.0180.00714.84
7.0.280.0200.00814.81
7.0.270.0170.00914.83
7.0.260.0200.00714.82
7.0.250.0230.00714.84
7.0.240.0190.00814.92
7.0.230.0200.00714.95
7.0.220.0560.01114.68
7.0.210.0200.00714.75
7.0.200.0200.00814.77
7.0.190.0200.00814.91
7.0.180.0240.01014.81
7.0.170.0180.01014.88
7.0.160.0160.01214.82
7.0.150.0190.01014.78
7.0.140.0190.00814.93
7.0.130.0180.00815.05
7.0.120.0180.00814.96
7.0.110.0190.00914.99
7.0.100.0190.01014.94
7.0.90.0190.01014.99
7.0.80.0190.00914.97
7.0.70.0170.00715.00
7.0.60.0170.00814.97
7.0.50.0190.00615.04
7.0.40.0230.00814.81
7.0.30.0150.01014.80
7.0.20.0210.00714.84
7.0.10.0180.00814.78
7.0.00.0170.00714.82
5.6.400.0180.00915.28
5.6.390.0160.01215.28
5.6.380.0170.01115.37
5.6.370.0180.00915.17
5.6.360.0160.01115.16
5.6.350.0190.00915.22
5.6.340.0160.01215.30
5.6.330.0200.00715.24
5.6.320.0170.01115.29
5.6.310.0200.01015.32
5.6.300.0200.01015.25
5.6.290.0210.01515.83
5.6.280.0160.01715.91
5.6.270.0190.01615.92
5.6.260.0190.01715.95
5.6.250.0190.01615.88
5.6.240.0190.01615.85
5.6.230.0200.01915.91
5.6.220.0180.01715.86
5.6.210.0190.01615.87
5.6.200.0170.01615.81
5.6.190.0150.01915.87
5.6.180.0180.01615.98
5.6.170.0170.01615.80
5.6.160.0180.01515.79
5.6.150.0200.01615.87
5.6.140.0160.01915.85
5.6.130.0190.01615.86
5.6.120.0190.01515.89
5.6.110.0200.01515.85
5.6.100.0150.01715.87
5.6.90.0140.01815.92
5.6.80.0170.01515.72
5.6.70.0190.01415.73
5.6.60.0150.01715.73
5.6.50.0170.01415.66
5.6.40.0190.01515.70
5.6.30.0180.01715.73
5.6.20.0170.01615.74
5.6.10.0160.01615.67
5.6.00.0170.01715.64
5.5.380.0180.02015.44
5.5.370.0180.01515.45
5.5.360.0190.01415.41
5.5.350.0170.01715.48
5.5.340.0140.01715.46
5.5.330.0140.01815.39
5.5.320.0150.02015.56
5.5.310.0170.01515.43
5.5.300.0200.01415.45
5.5.290.0150.02215.55
5.5.280.0190.01415.47
5.5.270.0200.01415.42
5.5.260.0150.01715.44
5.5.250.0160.01715.37
5.5.240.0170.01615.29
5.5.230.0160.01615.29
5.5.220.0190.01415.37
5.5.210.0150.01715.37
5.5.200.0160.01615.39
5.5.190.0200.01315.35
5.5.180.0190.01615.37
5.5.170.0190.00915.00
5.5.160.0180.01515.34
5.5.150.0160.01615.31
5.5.140.0140.01815.41
5.5.130.0150.01515.26
5.5.120.0130.02115.31
5.5.110.0150.01615.26
5.5.100.0160.01415.31
5.5.90.0170.01415.30
5.5.80.0130.01515.32
5.5.70.0140.01615.38
5.5.60.0160.01715.37
5.5.50.0180.01615.40
5.5.40.0170.01415.37
5.5.30.0140.01515.32
5.5.20.0130.01915.32
5.5.10.0150.01615.27
5.5.00.0170.01715.24
5.4.450.0120.01513.06
5.4.440.0100.01613.08
5.4.430.0140.01213.06
5.4.420.0140.01313.07
5.4.410.0140.01313.04
5.4.400.0140.01213.04
5.4.390.0120.01313.00
5.4.380.0130.01412.99
5.4.370.0150.01312.92
5.4.360.0140.01412.93
5.4.350.0150.01113.00
5.4.340.0120.01512.96
5.4.330.0160.00612.23
5.4.320.0140.01113.01
5.4.310.0150.01312.93
5.4.300.0130.01512.96
5.4.290.0130.01212.89
5.4.280.0110.01412.94
5.4.270.0140.01012.89
5.4.260.0130.01312.94
5.4.250.0120.01313.03
5.4.240.0110.01212.97
5.4.230.0130.01312.96
5.4.220.0120.01513.01
5.4.210.0160.01713.58
5.4.200.0150.01513.55
5.4.190.0150.01713.57
5.4.180.0160.01513.59
5.4.170.0170.01513.48
5.4.160.0130.01813.57
5.4.150.0160.01713.62
5.4.140.0160.01713.10
5.4.130.0130.02013.03
5.4.120.0160.01413.06
5.4.110.0140.01913.05
5.4.100.0150.01513.04
5.4.90.0110.02113.00
5.4.80.0140.01913.09
5.4.70.0140.01713.06
5.4.60.0150.01513.09
5.4.50.0120.01613.03
5.4.40.0140.01613.05
5.4.30.0150.01813.04
5.4.20.0130.01813.07
5.4.10.0140.01913.02
5.4.00.0110.02012.93
5.3.290.0140.01713.06
5.3.280.0130.01812.92
5.3.270.0150.01812.99
5.3.260.0140.01812.97
5.3.250.0170.01712.98
5.3.240.0140.02312.98
5.3.230.0160.01712.93
5.3.220.0150.01912.89
5.3.210.0170.01912.91
5.3.200.0140.01912.91
5.3.190.0170.01412.94
5.3.180.0150.01913.01
5.3.170.0140.01713.02
5.3.160.0130.01913.08
5.3.150.0160.02013.01
5.3.140.0150.01913.02
5.3.130.0150.01912.92
5.3.120.0130.02012.96
5.3.110.0150.02013.00
5.3.100.0140.01912.89
5.3.90.0170.01712.94
5.3.80.0160.02012.81
5.3.70.0160.01812.88
5.3.60.0150.01712.84
5.3.50.0130.01812.83
5.3.40.0150.01712.80
5.3.30.0160.01712.80
5.3.20.0160.01512.69
5.3.10.0150.01812.65
5.3.00.0150.01912.59

preferences:
150.44 ms | 1398 KiB | 7 Q