3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverse($string) { $substr1 = ""; $substr2 = ""; $strLength = strlen($string); $strLengthHalf = round(strlen($string) / 2); var_dump($strLength); var_dump($strLengthHalf); for ($i = 0; $i < (round(strlen($string)- 1 / 2 ); $i++) { $substr1 .= $string[$strLength-$i]; $substr2 .= $string[$strLengthHalf - $i]; } var_dump($substr1); var_dump($substr2); return $string = $substr1.$substr2; } var_dump(reverse('12345'));

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)
5.4.340.0070.03812.02
5.4.320.0080.03812.52
5.4.310.0080.03812.52
5.4.300.0060.03812.52
5.4.290.0100.03612.51
5.4.280.0070.03612.41
5.4.270.0090.03612.41
5.4.260.0060.04012.41
5.4.250.0040.04212.41
5.4.240.0080.04712.41
5.4.230.0070.05212.40
5.4.220.0130.04412.40
5.4.210.0110.03412.40
5.4.200.0060.03912.40
5.4.190.0080.03712.39
5.4.180.0050.03712.40
5.4.170.0050.03712.41
5.4.160.0060.03612.40
5.4.150.0090.03512.39
5.4.140.0070.03612.09
5.4.130.0060.03512.07
5.4.120.0060.03512.04
5.4.110.0050.04412.03
5.4.100.0070.04412.03
5.4.90.0080.04112.03
5.4.80.0080.04512.03
5.4.70.0060.04912.02
5.4.60.0090.04712.03
5.4.50.0090.04912.03
5.4.40.0080.04912.01
5.4.30.0070.03712.01
5.4.20.0070.03412.01
5.4.10.0070.03412.01
5.4.00.0050.03711.50
5.3.290.0080.04112.80
5.3.280.0100.03312.71
5.3.270.0070.03812.72
5.3.260.0090.03612.72
5.3.250.0060.03712.72
5.3.240.0030.04012.72
5.3.230.0140.03112.71
5.3.220.0060.03912.68
5.3.210.0050.03912.68
5.3.200.0030.03912.68
5.3.190.0080.03612.68
5.3.180.0030.03912.68
5.3.170.0070.03512.67
5.3.160.0070.03612.68
5.3.150.0060.03912.67
5.3.140.0080.03612.66
5.3.130.0070.04212.66
5.3.120.0120.03612.66
5.3.110.0080.03912.66
5.3.100.0150.03412.13
5.3.90.0110.03512.11
5.3.80.0070.03612.09
5.3.70.0050.03712.09
5.3.60.0060.03812.08
5.3.50.0060.03512.03
5.3.40.0060.03712.03
5.3.30.0060.03511.98
5.3.20.0050.03711.77
5.3.10.0120.02911.74
5.3.00.0060.03811.72
5.2.170.0080.0339.22
5.2.160.0090.0299.22
5.2.150.0090.0289.22
5.2.140.0110.0259.21
5.2.130.0070.0289.18
5.2.120.0070.0269.18
5.2.110.0050.0309.18
5.2.100.0060.0299.18
5.2.90.0040.0329.18
5.2.80.0070.0309.18
5.2.70.0080.0319.18
5.2.60.0050.0329.13
5.2.50.0060.0299.10
5.2.40.0050.0319.08
5.2.30.0060.0419.05
5.2.20.0100.0349.04
5.2.10.0060.0338.95
5.2.00.0050.0408.81
5.1.60.0080.0398.09
5.1.50.0050.0258.09
5.1.40.0030.0258.07
5.1.30.0080.0228.42
5.1.20.0070.0238.44
5.1.10.0020.0298.17
5.1.00.0040.0268.17
5.0.50.0040.0226.64
5.0.40.0040.0216.50
5.0.30.0020.0356.32
5.0.20.0060.0206.28
5.0.10.0040.0226.26
5.0.00.0040.0306.25
4.4.90.0040.0144.78
4.4.80.0030.0154.75
4.4.70.0040.0144.75
4.4.60.0030.0154.75
4.4.50.0030.0194.77
4.4.40.0010.0284.71
4.4.30.0030.0224.76
4.4.20.0070.0194.84
4.4.10.0040.0214.85
4.4.00.0030.0334.76
4.3.110.0030.0174.67
4.3.100.0030.0224.67
4.3.90.0000.0194.63
4.3.80.0060.0294.59
4.3.70.0020.0154.63
4.3.60.0030.0224.63
4.3.50.0030.0204.63
4.3.40.0020.0244.54
4.3.30.0020.0183.30
4.3.20.0040.0143.28
4.3.10.0020.0153.24
4.3.00.0130.0276.69

preferences:
156.26 ms | 1398 KiB | 7 Q