3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; for ($i = 0; $i < strlen($string) \ 2; $i++) { $substr1 += $string[strlen($string-$i)]; $substr2 += $string[$i]; } return $string = $substr1 + $string2; }

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)
5.4.340.0060.03512.03
5.4.320.0090.04212.52
5.4.310.0050.04212.52
5.4.300.0090.03512.52
5.4.290.0080.04312.51
5.4.280.0060.03712.41
5.4.270.0090.04512.41
5.4.260.0100.03612.41
5.4.250.0050.03912.41
5.4.240.0120.04212.41
5.4.230.0160.06112.40
5.4.220.0100.04112.40
5.4.210.0060.04012.40
5.4.200.0070.04912.40
5.4.190.0050.03612.40
5.4.180.0070.03512.40
5.4.170.0050.03612.40
5.4.160.0060.03512.40
5.4.150.0070.04112.39
5.4.140.0080.03712.09
5.4.130.0060.04112.07
5.4.120.0190.09012.04
5.4.110.0180.09312.03
5.4.100.0180.05712.03
5.4.90.0150.06012.03
5.4.80.0050.04312.03
5.4.70.0050.03912.02
5.4.60.0070.03712.02
5.4.50.0030.04112.03
5.4.40.0060.04112.01
5.4.30.0090.03812.01
5.4.20.0080.03512.01
5.4.10.0080.03512.02
5.4.00.0110.04811.50
5.3.290.0110.03512.80
5.3.280.0060.03912.71
5.3.270.0060.03912.72
5.3.260.0060.05412.71
5.3.250.0030.04012.72
5.3.240.0060.03812.72
5.3.230.0080.04412.71
5.3.220.0060.04112.68
5.3.210.0100.04212.68
5.3.200.0080.04212.68
5.3.190.0090.03512.68
5.3.180.0070.03512.68
5.3.170.0080.03812.67
5.3.160.0060.03712.67
5.3.150.0090.05212.67
5.3.140.0050.04712.66
5.3.130.0070.04812.66
5.3.120.0050.04112.66
5.3.110.0100.04112.66
5.3.100.0080.04912.13
5.3.90.0090.03512.11
5.3.80.0040.03912.09
5.3.70.0060.03712.10
5.3.60.0040.04512.09
5.3.50.0070.03512.02
5.3.40.0080.03512.02
5.3.30.0110.05211.98
5.3.20.0090.03811.76
5.3.10.0090.03411.74
5.3.00.0110.03111.72
5.2.170.0040.0339.22
5.2.160.0050.0309.22
5.2.150.0060.0319.22
5.2.140.0050.0339.21
5.2.130.0050.0329.17
5.2.120.0050.0309.18
5.2.110.0060.0309.18
5.2.100.0040.0299.18
5.2.90.0060.0309.18
5.2.80.0050.0329.18
5.2.70.0090.0419.17
5.2.60.0120.0529.13
5.2.50.0070.0419.09
5.2.40.0070.0389.07
5.2.30.0090.0299.04
5.2.20.0060.0279.04
5.2.10.0100.0228.95
5.2.00.0060.0288.80
5.1.60.0040.0248.09
5.1.50.0050.0248.08
5.1.40.0090.0218.07
5.1.30.0090.0328.42
5.1.20.0050.0298.43
5.1.10.0040.0278.16
5.1.00.0050.0268.16
5.0.50.0030.0236.64
5.0.40.0030.0196.50
5.0.30.0050.0316.31
5.0.20.0030.0196.28
5.0.10.0040.0206.26
5.0.00.0040.0306.25
4.4.90.0010.0174.78
4.4.80.0020.0164.75
4.4.70.0060.0184.75
4.4.60.0030.0154.76
4.4.50.0010.0164.77
4.4.40.0040.0244.71
4.4.30.0030.0204.76
4.4.20.0020.0184.84
4.4.10.0040.0184.85
4.4.00.0060.0224.76
4.3.110.0040.0234.67
4.3.100.0020.0204.66
4.3.90.0030.0174.63
4.3.80.0040.0234.58
4.3.70.0020.0154.63
4.3.60.0030.0154.63
4.3.50.0050.0144.62
4.3.40.0020.0244.54
4.3.30.0030.0163.30
4.3.20.0040.0173.28
4.3.10.0030.0213.24
4.3.00.0100.0207.07

preferences:
143.04 ms | 1398 KiB | 7 Q