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 < $strLengthHalf - 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)
8.3.40.0090.00618.96
8.3.30.0030.01019.14
8.3.20.0080.00020.18
8.3.10.0050.00323.79
8.3.00.0040.00419.38
8.2.170.0120.00622.96
8.2.160.0100.00720.43
8.2.150.0030.00524.18
8.2.140.0090.00624.66
8.2.130.0040.00426.16
8.2.120.0000.00822.18
8.2.110.0060.00322.24
8.2.100.0040.00817.88
8.2.90.0040.00419.13
8.2.80.0000.00817.97
8.2.70.0040.00417.63
8.2.60.0060.00618.05
8.2.50.0030.00618.07
8.2.40.0030.00620.01
8.2.30.0040.00418.25
8.2.20.0000.00717.80
8.2.10.0040.00418.06
8.2.00.0040.00417.74
8.1.270.0080.00022.18
8.1.260.0070.00026.35
8.1.250.0000.00728.09
8.1.240.0040.00424.04
8.1.230.0060.00619.22
8.1.220.0030.00517.74
8.1.210.0050.00318.77
8.1.200.0070.00317.24
8.1.190.0050.00317.35
8.1.180.0040.00418.10
8.1.170.0000.00818.65
8.1.160.0000.00822.02
8.1.150.0040.00418.84
8.1.140.0000.00717.50
8.1.130.0030.00317.88
8.1.120.0050.00217.35
8.1.110.0000.00917.34
8.1.100.0040.00417.46
8.1.90.0000.00717.41
8.1.80.0070.00017.37
8.1.70.0000.00717.33
8.1.60.0000.00817.54
8.1.50.0050.00317.49
8.1.40.0000.00817.57
8.1.30.0080.00017.65
8.1.20.0000.00817.78
8.1.10.0060.00317.56
8.1.00.0040.00417.62
8.0.300.0000.00818.77
8.0.290.0000.00716.75
8.0.280.0070.00018.51
8.0.270.0030.00317.32
8.0.260.0000.00718.49
8.0.250.0040.00417.02
8.0.240.0000.00716.97
8.0.230.0030.00317.00
8.0.220.0000.00617.08
8.0.210.0070.00017.00
8.0.200.0030.00317.03
8.0.190.0040.00417.04
8.0.180.0070.00017.10
8.0.170.0040.00417.04
8.0.160.0040.00417.07
8.0.150.0000.00716.91
8.0.140.0000.00716.96
8.0.130.0060.00013.45
8.0.120.0040.00417.02
8.0.110.0000.00717.01
8.0.100.0040.00417.00
8.0.90.0070.00017.02
8.0.80.0070.01117.08
8.0.70.0030.00517.13
8.0.60.0020.00517.06
8.0.50.0040.00416.90
8.0.30.0070.01317.24
8.0.20.0080.01117.40
8.0.10.0040.00417.02
8.0.00.0120.00916.77
7.4.330.0000.00615.15
7.4.320.0000.00816.60
7.4.300.0030.00316.47
7.4.290.0030.00316.58
7.4.280.0000.00716.51
7.4.270.0040.00416.51
7.4.260.0040.00416.57
7.4.250.0030.00316.55
7.4.240.0040.00316.52
7.4.230.0030.00316.77
7.4.220.0090.00916.77
7.4.210.0170.00016.44
7.4.200.0080.00016.47
7.4.160.0070.01016.70
7.4.150.0160.01017.40
7.4.140.0090.00917.86
7.4.130.0130.00316.55
7.4.120.0100.00916.64
7.4.110.0070.01316.50
7.4.100.0030.01416.51
7.4.90.0100.01316.58
7.4.80.0120.00619.39
7.4.70.0080.01216.53
7.4.60.0140.00316.62
7.4.50.0000.00416.57
7.4.40.0140.00316.64
7.4.30.0070.01016.57
7.4.00.0000.01314.97
7.3.330.0030.00313.52
7.3.320.0030.00313.33
7.3.310.0000.00716.36
7.3.300.0030.00316.36
7.3.290.0100.00716.49
7.3.280.0080.00916.47
7.3.270.0060.01317.40
7.3.260.0070.01016.55
7.3.250.0100.00616.63
7.3.240.0140.00316.68
7.3.230.0100.01416.59
7.3.210.0060.01716.48
7.3.200.0060.00919.39
7.3.190.0070.00916.66
7.3.180.0120.00316.74
7.3.170.0040.01316.73
7.3.160.0110.00716.61
7.2.330.0040.01316.66
7.2.320.0120.01216.98
7.2.310.0060.01816.74
7.2.300.0090.00916.84
7.2.290.0120.01216.81
7.2.00.0000.01219.60
7.1.100.0070.00318.16
7.1.70.0060.00317.09
7.1.60.0110.01419.11
7.1.50.0090.01616.98
7.1.00.0100.07022.28
7.0.200.0040.00416.79
7.0.140.0000.07721.97
7.0.100.0300.08319.99
7.0.90.0030.08019.89
7.0.80.0030.08319.95
7.0.70.0170.07319.89
7.0.60.0100.07719.88
7.0.50.0400.06320.29
7.0.40.0030.04720.11
7.0.30.0130.08320.00
7.0.20.0170.07719.96
7.0.10.0130.07320.07
7.0.00.0130.07320.12
5.6.280.0100.08720.78
5.6.250.0070.08320.54
5.6.240.0000.08720.55
5.6.230.0030.05020.60
5.6.220.0170.08020.48
5.6.210.0070.07020.77
5.6.200.0100.05021.05
5.6.190.0070.07721.11
5.6.180.0070.04720.99
5.6.170.0130.03321.05
5.6.160.0070.07720.96
5.6.150.0070.08021.09
5.6.140.0200.05320.93
5.6.130.0030.08021.02
5.6.120.0000.05720.94
5.6.110.0130.04720.93
5.6.100.0100.07021.06
5.6.90.0070.04721.10
5.6.80.0100.06320.41
5.6.70.0070.04720.40
5.6.60.0030.07720.55
5.6.50.0070.08020.43
5.6.40.0100.06320.32
5.6.30.0100.05720.42
5.6.20.0000.05720.32
5.6.10.0100.06720.31
5.6.00.0070.08020.39
5.5.380.0170.06720.55
5.5.370.0170.06720.56
5.5.360.0070.07720.34
5.5.350.0070.08020.40
5.5.340.0070.07320.79
5.5.330.0170.08320.90
5.5.320.0030.07720.61
5.5.310.0170.07320.83
5.5.300.0100.07720.77
5.5.290.0030.06020.92
5.5.280.0170.07320.64
5.5.270.0030.08720.88
5.5.260.0100.07320.85
5.5.250.0100.06020.70
5.5.240.0100.07320.30
5.5.230.0000.05020.13
5.5.220.0000.04320.15
5.5.210.0070.04020.29
5.5.200.0030.06020.26
5.5.190.0170.03720.15
5.5.180.0030.04319.99
5.5.160.0130.06720.25
5.5.150.0000.05320.26
5.5.140.0070.07720.11
5.5.130.0070.08020.24
5.5.120.0000.05320.21
5.5.110.0100.04020.26
5.5.100.0100.04720.05
5.5.90.0000.08720.05
5.5.80.0100.05720.07
5.5.70.0070.08019.97
5.5.60.0030.04020.06
5.5.50.0100.07020.06
5.5.40.0200.06320.05
5.5.30.0030.06719.93
5.5.20.0030.08020.05
5.5.10.0070.07719.98
5.5.00.0130.06320.04
5.4.450.0100.07319.62
5.4.440.0030.08719.54
5.4.430.0070.08319.29
5.4.420.0030.07019.54
5.4.410.0070.07019.16
5.4.400.0100.04019.13
5.4.390.0170.07019.21
5.4.380.0030.05718.96
5.4.370.0030.07718.91
5.4.360.0170.05019.22
5.4.350.0100.07319.19
5.4.340.0030.04018.92
5.4.320.0000.04719.03
5.4.310.0070.07718.93
5.4.300.0130.06719.29
5.4.290.0100.06318.96
5.4.280.0000.08718.94
5.4.270.0100.04019.29
5.4.260.0030.06719.13
5.4.250.0030.05718.96
5.4.240.0100.07018.90
5.4.230.0200.05318.96
5.4.220.0130.05719.21
5.4.210.0070.08719.20
5.4.200.0000.07019.11
5.4.190.0070.04319.03
5.4.180.0000.05019.12
5.4.170.0100.06719.10
5.4.160.0170.05718.92
5.4.150.0070.07319.02
5.4.140.0170.06316.33
5.4.130.0070.04716.42
5.4.120.0100.06716.32
5.4.110.0030.07016.51
5.4.100.0130.06016.35
5.4.90.0070.07316.40
5.4.80.0030.04316.52
5.4.70.0100.06316.41
5.4.60.0070.04016.43
5.4.50.0070.06316.40
5.4.40.0030.05316.52
5.4.30.0070.06016.36
5.4.20.0030.07716.45
5.4.10.0100.07016.29
5.4.00.0070.07315.82
5.3.290.0030.04014.78
5.3.280.0030.04014.71
5.3.270.0130.06714.64
5.3.260.0130.08014.74
5.3.250.0070.04314.63
5.3.240.0100.07014.71
5.3.230.0070.04314.71
5.3.220.0030.08014.66
5.3.210.0030.07014.59
5.3.200.0100.07314.68
5.3.190.0070.08314.61
5.3.180.0070.07314.62
5.3.170.0070.03714.61
5.3.160.0200.03314.60
5.3.150.0070.06014.55
5.3.140.0200.05714.58
5.3.130.0130.06714.59
5.3.120.0070.08014.53
5.3.110.0070.06714.55
5.3.100.0100.06714.08
5.3.90.0070.07314.13
5.3.80.0070.03314.14
5.3.70.0070.08014.02
5.3.60.0130.05014.13
5.3.50.0030.06714.04
5.3.40.0100.07013.93
5.3.30.0070.07013.95
5.3.20.0030.07013.79
5.3.10.0030.07313.58
5.3.00.0030.07313.66
5.2.170.0000.06312.26
5.2.160.0070.04312.26
5.2.150.0030.06312.26
5.2.140.0070.06012.26
5.2.130.0070.05012.26
5.2.120.0100.05712.26
5.2.110.0070.05712.26
5.2.100.0070.05012.26
5.2.90.0000.05712.26
5.2.80.0030.06312.26
5.2.70.0070.04712.26
5.2.60.0070.05712.26
5.2.50.0000.05012.26
5.2.40.0100.04712.26
5.2.30.0070.03012.26
5.2.20.0030.02712.26
5.2.10.0070.03312.26
5.2.00.0000.06012.26
5.1.60.0100.04312.26
5.1.50.0000.05312.26
5.1.40.0030.02012.26
5.1.30.0070.05712.26
5.1.20.0070.05312.26
5.1.10.0030.05012.26
5.1.00.0070.05012.26
5.0.50.0070.04712.26
5.0.40.0000.04712.26
5.0.30.0000.06712.26
5.0.20.0030.03312.26
5.0.10.0100.03312.26
5.0.00.0000.06012.26
4.4.90.0000.02312.26
4.4.80.0030.03312.26
4.4.70.0030.01312.26
4.4.60.0000.04012.26
4.4.50.0000.02312.26
4.4.40.0000.05312.26
4.4.30.0000.04012.26
4.4.20.0000.03712.26
4.4.10.0000.03012.26
4.4.00.0030.03012.26
4.3.110.0000.02012.26
4.3.100.0030.01312.26
4.3.90.0000.02012.26
4.3.80.0030.05312.26
4.3.70.0100.02312.26
4.3.60.0030.01712.26
4.3.50.0000.03012.26
4.3.40.0070.04312.26
4.3.30.0030.02312.26
4.3.20.0030.03312.26
4.3.10.0000.03712.26
4.3.00.0030.02012.26

preferences:
40.34 ms | 400 KiB | 5 Q