3v4l.org

run code in 300+ PHP versions simultaneously
<?php function initialiseStr(&$var = null) { if (!isset($var)) { $var = ''; } } initialiseStr($foo); var_dump($foo);

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)
8.3.60.0060.01218.14
8.3.50.0120.00717.57
8.3.40.0120.00318.58
8.3.30.0060.00918.47
8.3.20.0080.00018.47
8.3.10.0060.00320.51
8.3.00.0080.00017.38
8.2.180.0070.01416.36
8.2.170.0070.00722.96
8.2.160.0070.00722.08
8.2.150.0080.00024.18
8.2.140.0040.00424.66
8.2.130.0070.00026.16
8.2.120.0100.00319.89
8.2.110.0090.00022.27
8.2.100.0090.00317.63
8.2.90.0070.00019.09
8.2.80.0050.00317.97
8.2.70.0040.00417.50
8.2.60.0040.00418.04
8.2.50.0040.00418.07
8.2.40.0040.00418.22
8.2.30.0040.00418.11
8.2.20.0000.00817.70
8.2.10.0040.00417.65
8.2.00.0040.00417.52
8.1.280.0110.00425.92
8.1.270.0000.00824.66
8.1.260.0040.00426.35
8.1.250.0080.00028.09
8.1.240.0060.00321.02
8.1.230.0130.00017.42
8.1.220.0040.00417.74
8.1.210.0030.00518.77
8.1.200.0060.00317.35
8.1.190.0050.00317.35
8.1.180.0000.00918.10
8.1.170.0000.00818.78
8.1.160.0000.00718.94
8.1.150.0030.00518.54
8.1.140.0070.00317.44
8.1.130.0040.00417.86
8.1.120.0050.00217.48
8.1.110.0040.00417.32
8.1.100.0040.00417.43
8.1.90.0070.00317.46
8.1.80.0000.00817.32
8.1.70.0040.00417.45
8.1.60.0000.00817.60
8.1.50.0000.00717.45
8.1.40.0000.00817.54
8.1.30.0040.00417.57
8.1.20.0030.00617.63
8.1.10.0040.00417.53
8.1.00.0040.00417.32
8.0.300.0040.00418.77
8.0.290.0030.00516.63
8.0.280.0000.00818.43
8.0.270.0030.00317.15
8.0.260.0040.00416.72
8.0.250.0000.00816.92
8.0.240.0000.00816.83
8.0.230.0000.00716.98
8.0.220.0030.00316.83
8.0.210.0070.00016.76
8.0.200.0030.00316.95
8.0.190.0000.00716.95
8.0.180.0000.00716.91
8.0.170.0060.00316.80
8.0.160.0040.00416.93
8.0.150.0050.00316.82
8.0.140.0040.00416.84
8.0.130.0050.00013.32
8.0.120.0030.00616.76
8.0.110.0030.00316.79
8.0.100.0000.00816.91
8.0.90.0030.00316.80
8.0.80.0030.01616.86
8.0.70.0050.00216.91
8.0.60.0040.00416.84
8.0.50.0040.00416.78
8.0.30.0120.00817.13
8.0.20.0150.00517.07
8.0.10.0070.00016.90
8.0.00.0080.01216.71
7.4.330.0050.00014.83
7.4.320.0000.00716.59
7.4.300.0000.00716.43
7.4.290.0000.00716.39
7.4.280.0030.00616.60
7.4.270.0000.00716.48
7.4.260.0050.00013.24
7.4.250.0080.00016.55
7.4.240.0030.00316.63
7.4.230.0000.00716.39
7.4.220.0130.01016.55
7.4.210.0080.00916.54
7.4.200.0030.00316.68
7.4.190.0030.00516.40
7.4.160.0080.00816.57
7.4.150.0070.01017.07
7.4.140.0190.01617.17
7.4.130.0190.01616.49
7.4.120.0060.01016.46
7.4.110.0120.00616.56
7.4.100.0080.01216.57
7.4.90.0100.00716.55
7.4.80.0100.01018.80
7.4.70.0000.00016.36
7.4.60.0120.00616.49
7.4.50.0030.00623.17
7.4.40.0100.00721.69
7.4.30.0120.00416.55
7.4.10.0130.00714.88
7.4.00.0070.00814.71
7.3.330.0030.00313.03
7.3.320.0000.00613.02
7.3.310.0030.00316.18
7.3.300.0070.00016.27
7.3.290.0110.00816.20
7.3.280.0070.00916.21
7.3.270.0090.00917.07
7.3.260.0060.01318.24
7.3.250.0150.00316.29
7.3.240.0090.00816.30
7.3.230.0110.00716.30
7.3.210.0090.00616.41
7.3.200.0170.00019.39
7.3.190.0130.00316.54
7.3.180.0030.01316.42
7.3.170.0170.00316.42
7.3.160.0060.00916.58
7.3.130.0130.00314.72
7.3.120.0100.00514.78
7.3.110.0130.00315.04
7.3.100.0090.00614.52
7.3.90.0070.01014.58
7.3.80.0030.00614.78
7.3.70.0040.01114.76
7.3.60.0100.00314.44
7.3.50.0030.00914.84
7.3.40.0060.00314.75
7.3.30.0070.00714.75
7.3.20.0040.00416.74
7.3.10.0100.00316.75
7.3.00.0070.00716.57
7.2.330.0070.01116.69
7.2.320.0130.00316.66
7.2.310.0130.01016.41
7.2.300.0000.01716.57
7.2.290.0120.00916.31
7.2.260.0070.01114.72
7.2.250.0060.01314.84
7.2.240.0100.00714.78
7.2.230.0040.01514.72
7.2.220.0060.00614.85
7.2.210.0070.00715.00
7.2.200.0030.01014.92
7.2.190.0110.00414.59
7.2.180.0090.00614.94
7.2.170.0000.00914.84
7.2.160.0100.00614.91
7.2.150.0100.00716.60
7.2.140.0090.00616.54
7.2.130.0030.01016.94
7.2.120.0000.01316.74
7.2.110.0100.00316.53
7.2.100.0060.00316.86
7.2.90.0030.00916.91
7.2.80.0110.00316.71
7.2.70.0070.00416.71
7.2.60.0030.01216.76
7.2.50.0140.00016.67
7.2.40.0040.00816.71
7.2.30.0030.01016.71
7.2.20.0060.01316.70
7.2.10.0030.00816.73
7.2.00.0050.01118.20
7.1.330.0100.00315.51
7.1.320.0000.01215.60
7.1.310.0040.01115.64
7.1.300.0070.00715.54
7.1.290.0030.00615.39
7.1.280.0000.01315.71
7.1.270.0030.00715.51
7.1.260.0040.00415.72
7.1.250.0090.00315.58
7.1.240.0070.00715.57
7.1.230.0050.00315.71
7.1.220.0080.00415.82
7.1.210.0100.00015.77
7.1.200.0040.00615.71
7.1.190.0050.00315.61
7.1.180.0030.00615.41
7.1.170.0030.00715.63
7.1.160.0000.00815.63
7.1.150.0130.00015.80
7.1.140.0000.01215.68
7.1.130.0060.00615.43
7.1.120.0060.00315.77
7.1.110.0120.00015.85
7.1.100.0030.00716.86
7.1.90.0090.00015.76
7.1.80.0030.00615.52
7.1.70.0030.00816.38
7.1.60.0080.01017.41
7.1.50.0120.01225.36
7.1.40.0080.00415.65
7.1.30.0090.00315.72
7.1.20.0080.00415.64
7.1.10.0090.00615.77
7.1.00.0080.02519.04
7.0.330.0060.00615.12
7.0.320.0060.00315.29
7.0.310.0000.00915.48
7.0.300.0070.01015.29
7.0.290.0030.01315.36
7.0.280.0040.00415.03
7.0.270.0030.01015.12
7.0.260.0040.00415.13
7.0.250.0030.01015.29
7.0.240.0100.00315.36
7.0.230.0040.00415.30
7.0.220.0040.00815.26
7.0.210.0060.00615.16
7.0.200.0030.00715.94
7.0.190.0000.01215.08
7.0.180.0100.00315.32
7.0.170.0110.00315.45
7.0.160.0070.00715.50
7.0.150.0090.00315.16
7.0.140.0050.04018.53
7.0.130.0000.00815.46
7.0.120.0020.02018.73
7.0.110.0100.04018.51
7.0.100.0080.04218.49
7.0.90.0070.04118.62
7.0.80.0050.02818.52
7.0.70.0050.02318.49
7.0.60.0050.04118.47
7.0.50.0080.04218.61
7.0.40.0020.04116.57
7.0.30.0100.03216.51
7.0.20.0050.03716.53
7.0.10.0050.03916.55
7.0.00.0070.03316.54
5.6.400.0100.00314.16
5.6.390.0090.00314.32
5.6.380.0030.00713.93
5.6.370.0030.00614.22
5.6.360.0080.00613.89
5.6.350.0000.01014.30
5.6.340.0030.01014.39
5.6.330.0140.00014.36
5.6.320.0000.01113.84
5.6.310.0090.00014.33
5.6.300.0000.00913.93
5.6.290.0090.00614.47
5.6.280.0080.03717.49
5.6.270.0000.01014.13
5.6.260.0020.03917.46
5.6.250.0080.02317.52
5.6.240.0050.02417.40
5.6.230.0040.04417.45
5.6.220.0080.04217.40
5.6.210.0050.04217.36
5.6.200.0100.04117.37
5.6.190.0030.04417.34
5.6.180.0120.03917.22
5.6.170.0100.04417.36
5.6.160.0120.04017.43
5.6.150.0050.02817.29
5.6.140.0070.04317.38
5.6.130.0070.04317.33
5.6.120.0080.04017.24
5.6.110.0050.02717.29
5.6.100.0090.02517.53
5.6.90.0080.02817.54
5.6.80.0110.01817.10
5.6.70.0060.02317.05
5.6.60.0030.04217.00
5.6.50.0020.03217.08
5.6.40.0030.03517.19
5.6.30.0030.02316.97
5.6.20.0100.01817.11
5.6.10.0040.02817.08
5.6.00.0050.02517.24
5.5.380.0020.04417.12
5.5.370.0020.05017.25
5.5.360.0110.03317.28
5.5.350.0020.04717.10
5.5.340.0070.04117.48
5.5.330.0060.04317.56
5.5.320.0060.04317.45
5.5.310.0100.03917.57
5.5.300.0030.04817.51
5.5.290.0110.03617.24
5.5.280.0050.04617.35
5.5.270.0070.04417.67
5.5.260.0050.04617.43
5.5.250.0060.02117.39
5.5.240.0020.02516.98
5.5.230.0030.02417.15
5.5.220.0030.02717.14
5.5.210.0120.01817.14
5.5.200.0030.02717.17
5.5.190.0070.03217.13
5.5.180.0030.02316.96
5.5.170.0070.00714.17
5.5.160.0030.02517.18
5.5.150.0020.02817.24
5.5.140.0050.02117.17
5.5.130.0030.02417.13
5.5.120.0060.02017.06
5.5.110.0020.02617.18
5.5.100.0060.02117.23
5.5.90.0030.02616.93
5.5.80.0050.02716.93
5.5.70.0020.03516.99
5.5.60.0040.02517.12
5.5.50.0080.02017.09
5.5.40.0020.02216.85
5.5.30.0030.02317.02
5.5.20.0000.02417.03
5.5.10.0050.02316.96
5.5.00.0050.02316.99
5.4.450.0070.04015.17
5.4.440.0080.03415.28
5.4.430.0110.03215.12
5.4.420.0000.03115.19
5.4.410.0060.03015.08
5.4.400.0000.02814.90
5.4.390.0050.02115.05
5.4.380.0050.03015.12
5.4.370.0000.03015.03
5.4.360.0020.02714.86
5.4.350.0070.01814.76
5.4.340.0070.02214.96
5.4.330.0050.00510.73
5.4.320.0030.02914.95
5.4.310.0060.02314.96
5.4.300.0050.02014.85
5.4.290.0050.02715.06
5.4.280.0010.02515.04
5.4.270.0050.02515.10
5.4.260.0030.02315.10
5.4.250.0040.02114.91
5.4.240.0030.02115.04
5.4.230.0030.02315.15
5.4.220.0050.02715.01
5.4.210.0030.02414.87
5.4.200.0020.02215.15
5.4.190.0030.02014.96
5.4.180.0020.02515.00
5.4.170.0060.02214.95
5.4.160.0040.02414.92
5.4.150.0000.02314.95
5.4.140.0040.02113.69
5.4.130.0070.03913.49
5.4.120.0050.01813.69
5.4.110.0050.02013.58
5.4.100.0040.02113.72
5.4.90.0050.04313.63
5.4.80.0060.03613.71
5.4.70.0000.04513.63
5.4.60.0000.02913.81
5.4.50.0060.03913.77
5.4.40.0030.02013.67
5.4.30.0000.02013.61
5.4.20.0070.03413.67
5.4.10.0020.04313.71
5.4.00.0050.03813.35
5.3.290.0080.03312.74
5.3.280.0050.03512.62
5.3.270.0030.02512.71
5.3.260.0050.01812.77
5.3.250.0050.01812.71
5.3.240.0030.02012.53
5.3.230.0080.01512.50
5.3.220.0070.01812.46
5.3.210.0020.02512.55
5.3.200.0040.02012.45
5.3.190.0080.03512.42
5.3.180.0080.03712.62
5.3.170.0060.03212.49
5.3.160.0030.03512.55
5.3.150.0060.04312.46
5.3.140.0020.03812.44
5.3.130.0060.04212.40
5.3.120.0070.04112.54
5.3.110.0070.03312.50
5.3.100.0020.02912.23
5.3.90.0000.02612.20
5.3.80.0050.03812.19
5.3.70.0100.01912.09
5.3.60.0100.03312.25
5.3.50.0060.02012.16
5.3.40.0010.04312.14
5.3.30.0020.02412.22
5.3.20.0000.02112.03
5.3.10.0070.03812.02
5.3.00.0050.02611.93
5.2.170.0070.06011.61
5.2.160.0070.02011.61
5.2.150.0000.06011.61
5.2.140.0000.05311.61
5.2.130.0100.05311.61
5.2.120.0030.05311.61
5.2.110.0030.04711.61
5.2.100.0070.05711.61
5.2.90.0000.06011.61
5.2.80.0070.05711.61
5.2.70.0070.06011.61
5.2.60.0100.04711.61
5.2.50.0030.06011.61
5.2.40.0000.06011.61
5.2.30.0030.05711.61
5.2.20.0070.05711.61
5.2.10.0070.03011.61
5.2.00.0070.05011.61
5.1.60.0070.05011.61
5.1.50.0070.05311.61
5.1.40.0030.05311.61
5.1.30.0070.05311.61
5.1.20.0070.05311.61
5.1.10.0170.03711.61
5.1.00.0030.05311.61
5.0.50.0000.04711.61
5.0.40.0000.03011.61
5.0.30.0030.06011.61
5.0.20.0030.04311.61
5.0.10.0000.04311.61
5.0.00.0030.06011.61
4.4.90.0030.02011.61
4.4.80.0000.01711.61
4.4.70.0000.03711.61
4.4.60.0030.03311.61
4.4.50.0000.03011.61
4.4.40.0030.04311.61
4.4.30.0030.02011.61
4.4.20.0000.03311.61
4.4.10.0030.03011.61
4.4.00.0030.05011.61
4.3.110.0030.03311.61
4.3.100.0000.03311.61
4.3.90.0000.03711.61
4.3.80.0030.05011.61
4.3.70.0030.03011.61
4.3.60.0030.03311.61
4.3.50.0000.03311.61
4.3.40.0000.05311.61
4.3.30.0000.03711.61
4.3.20.0030.03311.61
4.3.10.0030.03311.61
4.3.00.0030.02311.61

preferences:
46.27 ms | 401 KiB | 5 Q