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) / 2 - 1); $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)
5.4.340.0080.03612.03
5.4.320.0070.04512.52
5.4.310.0080.04812.52
5.4.300.0080.03912.52
5.4.290.0080.04512.51
5.4.280.0100.04712.41
5.4.270.0090.03612.41
5.4.260.0090.03712.41
5.4.250.0100.04912.41
5.4.240.0120.04712.41
5.4.230.0050.05612.40
5.4.220.0060.04612.40
5.4.210.0060.03712.40
5.4.200.0040.04112.40
5.4.190.0070.03812.40
5.4.180.0080.03812.40
5.4.170.0130.04212.41
5.4.160.0150.04112.40
5.4.150.0090.04312.40
5.4.140.0190.03812.09
5.4.130.0090.03412.07
5.4.120.0070.03512.03
5.4.110.0090.03512.04
5.4.100.0040.04112.04
5.4.90.0120.03512.03
5.4.80.0040.04212.03
5.4.70.0030.03912.03
5.4.60.0070.04012.02
5.4.50.0050.04112.02
5.4.40.0080.03512.01
5.4.30.0090.03612.01
5.4.20.0070.03812.00
5.4.10.0080.03612.01
5.4.00.0090.04211.50
5.3.290.0150.04312.80
5.3.280.0080.04012.71
5.3.270.0130.03412.72
5.3.260.0070.04512.72
5.3.250.0080.03712.72
5.3.240.0070.03912.71
5.3.230.0080.03812.70
5.3.220.0070.03812.68
5.3.210.0100.03812.68
5.3.200.0060.03812.68
5.3.190.0080.03712.68
5.3.180.0070.03712.67
5.3.170.0060.03712.67
5.3.160.0090.04312.67
5.3.150.0130.04812.67
5.3.140.0070.04312.66
5.3.130.0100.04512.66
5.3.120.0080.04012.66
5.3.110.0040.04212.66
5.3.100.0060.03812.14
5.3.90.0050.03812.11
5.3.80.0070.03612.09
5.3.70.0040.03912.10
5.3.60.0050.04212.09
5.3.50.0050.04112.02
5.3.40.0070.03912.02
5.3.30.0070.03711.98
5.3.20.0070.03611.77
5.3.10.0050.03611.74
5.3.00.0050.04211.72
5.2.170.0050.0379.22
5.2.160.0020.0339.22
5.2.150.0060.0319.22
5.2.140.0060.0329.21
5.2.130.0030.0329.18
5.2.120.0050.0369.18
5.2.110.0050.0309.19
5.2.100.0070.0269.18
5.2.90.0040.0319.18
5.2.80.0060.0299.18
5.2.70.0030.0339.18
5.2.60.0020.0349.13
5.2.50.0030.0349.10
5.2.40.0020.0429.08
5.2.30.0070.0369.05
5.2.20.0060.0389.04
5.2.10.0040.0408.95
5.2.00.0050.0418.81
5.1.60.0060.0308.09
5.1.50.0070.0318.09
5.1.40.0080.0328.07
5.1.30.0080.0348.42
5.1.20.0070.0378.44
5.1.10.0090.0318.16
5.1.00.0090.0338.17
5.0.50.0070.0206.65
5.0.40.0060.0276.51
5.0.30.0030.0416.32
5.0.20.0040.0256.29
5.0.10.0060.0256.26
5.0.00.0040.0386.25
4.4.90.0040.0224.78
4.4.80.0050.0214.76
4.4.70.0030.0224.76
4.4.60.0100.0144.75
4.4.50.0070.0174.77
4.4.40.0060.0304.71
4.4.30.0050.0194.76
4.4.20.0040.0164.84
4.4.10.0040.0164.85
4.4.00.0030.0284.76
4.3.110.0060.0144.67
4.3.100.0060.0174.66
4.3.90.0040.0134.63
4.3.80.0000.0294.58
4.3.70.0040.0134.63
4.3.60.0020.0154.63
4.3.50.0010.0174.63
4.3.40.0070.0204.54
4.3.30.0010.0183.30
4.3.20.0000.0183.28
4.3.10.0020.0173.25
4.3.00.0170.0176.69

preferences:
141.51 ms | 1394 KiB | 7 Q