3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = "12345"; $time_start = microtime(true); echo $var[0] . "-" . substr($var,1) . "\n"; $time_end = microtime(true); echo "\nExecution Time: " . $time_end - $time_start . "\n"; $time_start2 = microtime(true); echo str_replace($var[0], $var[0].'-', $var) . "\n"; $time_end2 = microtime(true); echo "\nExecution Time: " . $time_end2 - $time_start2; $time_start3 = microtime(true); echo substr_replace($var, '-', 1, 0) . "\n"; $time_end3 = microtime(true); echo "\nExecution Time: " . $time_end3 - $time_start3;

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)
7.2.00.0040.01219.56
7.1.70.0000.00817.10
7.1.60.0060.01319.40
7.1.50.0070.01716.64
7.1.00.0000.03722.36
7.0.200.0050.00216.73
7.0.140.0100.06721.96
7.0.60.0070.06019.92
7.0.50.0170.07317.82
7.0.40.0100.08020.16
7.0.30.0330.04020.00
7.0.20.0230.07720.30
7.0.10.0200.04720.30
7.0.00.0200.07320.16
5.6.210.0070.03720.68
5.6.200.0000.08318.21
5.6.190.0030.07320.39
5.6.180.0330.07020.23
5.6.170.0200.03720.71
5.6.160.0100.06720.49
5.6.150.0100.08018.19
5.6.140.0000.05018.11
5.6.130.0100.04018.14
5.6.120.0100.05721.13
5.6.110.0030.05720.99
5.6.100.0100.08321.00
5.6.90.0130.07320.88
5.6.80.0070.07720.37
5.6.70.0270.04020.46
5.5.350.0400.07020.43
5.5.340.0030.04017.91
5.5.330.0100.04320.46
5.5.320.0370.06020.25
5.5.310.0430.07020.25
5.5.300.0070.08017.98
5.5.290.0030.04017.89
5.5.280.0130.08020.63
5.5.270.0030.04020.86
5.5.260.0030.04320.72
5.5.250.0070.08720.66
5.5.240.0070.08020.28
5.4.450.0230.07019.57
5.4.440.0230.07019.57
5.4.430.0270.07019.27
5.4.420.0300.06719.20
5.4.410.0300.08019.43
5.4.400.0230.07018.94
5.4.390.0400.06718.80
5.4.380.0200.07719.20
5.4.370.0300.07019.13
5.4.360.0270.05019.09
5.4.350.0270.07018.88
5.4.340.0230.06319.09
5.4.320.0200.07318.81
5.4.310.0130.06019.13
5.4.300.0230.07019.15
5.4.290.0330.03319.13
5.4.280.0230.05718.88
5.4.270.0270.05318.92
5.4.260.0200.07319.07
5.4.250.0230.04019.15
5.4.240.0200.04719.09
5.4.230.0270.06019.05
5.4.220.0070.04719.12
5.4.210.0230.03719.24
5.4.200.0300.06719.12
5.4.190.0200.07318.92
5.4.180.0270.06318.87
5.4.170.0170.08018.91
5.4.160.0270.06319.05
5.4.150.0230.07718.86
5.4.140.0300.06316.29
5.4.130.0370.06016.43
5.4.120.0330.06016.17
5.4.110.0270.05016.43
5.4.100.0200.07316.22
5.4.90.0300.07016.20
5.4.80.0200.07716.42
5.4.70.0170.07316.37
5.4.60.0230.07016.52
5.4.50.0170.04716.05
5.4.40.0170.07016.17
5.4.30.0200.07016.43
5.4.20.0270.07016.31
5.4.10.0330.04316.38
5.4.00.0230.06715.82
5.3.290.0270.07014.51
5.3.280.0200.07314.54
5.3.270.0330.06314.69
5.3.260.0230.06714.63
5.3.250.0300.06314.48
5.3.240.0270.07014.54
5.3.230.0200.06014.55
5.3.220.0170.06014.41
5.3.210.0270.06014.42
5.3.200.0330.05314.52
5.3.190.0230.07014.61
5.3.180.0230.05014.54
5.3.170.0230.07314.66
5.3.160.0200.08014.44
5.3.150.0230.07014.40
5.3.140.0270.06714.39
5.3.130.0230.07714.39
5.3.120.0200.06314.45
5.3.110.0200.07014.52
5.3.100.0230.06014.08
5.3.90.0270.06013.88
5.3.80.0270.06713.97
5.3.70.0230.06714.04
5.3.60.0330.04713.88
5.3.50.0270.07713.80
5.3.40.0230.06713.89
5.3.30.0300.08013.88
5.3.20.0100.08013.47
5.3.10.0300.06313.51
5.3.00.0270.06313.58
5.2.170.0170.04712.03
5.2.160.0230.05712.03
5.2.150.0230.05312.03
5.2.140.0170.06312.03
5.2.130.0170.06312.03
5.2.120.0200.06012.03
5.2.110.0230.04712.03
5.2.100.0200.05712.03
5.2.90.0170.06012.03
5.2.80.0200.05712.03
5.2.70.0200.05712.03
5.2.60.0200.06012.03
5.2.50.0200.05012.03
5.2.40.0230.05312.03
5.2.30.0130.06012.03
5.2.20.0130.05312.03
5.2.10.0230.05012.03
5.2.00.0130.06012.03
5.1.60.0170.02712.03
5.1.50.0170.03012.03
5.1.40.0130.02712.03
5.1.30.0100.03012.03
5.1.20.0200.04312.03
5.1.10.0170.04712.03
5.1.00.0270.04312.03
5.0.50.0100.04312.03
5.0.40.0070.04312.03
5.0.30.0100.05712.03
5.0.20.0070.04712.03
5.0.10.0100.03712.03
5.0.00.0100.05012.03
4.4.90.0130.03012.03
4.4.80.0070.03312.03
4.4.70.0070.02712.03
4.4.60.0030.03012.03
4.4.50.0070.03712.03
4.4.40.0070.04312.03
4.4.30.0070.02012.03
4.4.20.0070.02012.03
4.4.10.0130.03012.03
4.4.00.0200.04712.03
4.3.110.0130.02712.03
4.3.100.0100.04012.03
4.3.90.0030.03712.03
4.3.80.0070.04312.03
4.3.70.0100.03312.03
4.3.60.0100.03312.03
4.3.50.0130.03312.03
4.3.40.0030.06012.03
4.3.30.0030.03712.03
4.3.20.0030.03712.03
4.3.10.0070.03312.03
4.3.00.0030.03312.03

preferences:
34.62 ms | 401 KiB | 5 Q