3v4l.org

run code in 300+ PHP versions simultaneously
<?php function substr_utf8($string, $start, $length) { $chars = $string; $i=0; do { if (preg_match ("/[0-9a-zA-Z]/", $chars[$i])){ $m++; } else { $n++; }//非英文字节, $k = $n/3 + $m/2; $l = $n/3 + $m; $i++; } while ($k < $length); $str1 = mb_substr($string,$start,$l,'utf-8'); return $str1; } $a = '测试这是一个测试'; $a = 'xxxxbbbbbnnn'; $b = substr_utf8($a,0,5); var_dump($b); ?>

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)
8.3.70.0070.01116.86
8.3.60.0070.01416.75
8.3.50.0110.00716.73
8.3.40.0220.00019.05
8.3.30.0150.00019.04
8.3.20.0000.00918.91
8.3.10.0040.00420.91
8.3.00.0030.00619.63
8.2.180.0030.01418.66
8.2.170.0040.01122.96
8.2.160.0030.01021.31
8.2.150.0120.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0080.00018.03
8.2.110.0060.00320.88
8.2.100.0030.01017.88
8.2.90.0060.00319.32
8.2.80.0040.00419.45
8.2.70.0030.00518.00
8.2.60.0090.00018.05
8.2.50.0050.00318.07
8.2.40.0040.00418.22
8.2.30.0040.00418.13
8.2.20.0050.00317.92
8.2.10.0040.00418.01
8.2.00.0090.00017.89
8.1.280.0040.01125.92
8.1.270.0050.00224.66
8.1.260.0030.00626.35
8.1.250.0030.00528.09
8.1.240.0070.00320.95
8.1.230.0030.00917.61
8.1.220.0040.00418.76
8.1.210.0080.00018.77
8.1.200.0050.00517.38
8.1.190.0080.00017.55
8.1.180.0080.00018.10
8.1.170.0060.00318.76
8.1.160.0040.00418.77
8.1.150.0000.00718.63
8.1.140.0040.00417.45
8.1.130.0000.00717.45
8.1.120.0040.00417.60
8.1.110.0000.00817.51
8.1.100.0000.00817.52
8.1.90.0070.00017.56
8.1.80.0040.00417.54
8.1.70.0030.00517.49
8.1.60.0040.00417.65
8.1.50.0060.00317.66
8.1.40.0040.00417.73
8.1.30.0080.00017.85
8.1.20.0050.00317.85
8.1.10.0030.00517.78
8.1.00.0090.00317.63
8.0.300.0040.00418.77
8.0.290.0030.00516.88
8.0.280.0040.00418.44
8.0.270.0030.00317.33
8.0.260.0000.00817.12
8.0.250.0030.00517.27
8.0.240.0110.00017.09
8.0.230.0040.00417.21
8.0.220.0000.00717.03
8.0.210.0070.00017.08
8.0.200.0050.00217.27
8.0.190.0040.00417.09
8.0.180.0040.00417.10
8.0.170.0060.00317.15
8.0.160.0030.00317.00
8.0.150.0040.00417.04
8.0.140.0070.00417.08
8.0.130.0050.00013.57
8.0.120.0000.00716.94
8.0.110.0040.00417.11
8.0.100.0070.00017.09
8.0.90.0020.00517.16
8.0.80.0090.01217.10
8.0.70.0050.00217.06
8.0.60.0080.00017.13
8.0.50.0000.00717.21
8.0.30.0120.00717.24
8.0.20.0120.00717.28
8.0.10.0070.00017.22
8.0.00.0100.01217.03
7.4.330.0020.00213.14
7.4.320.0070.00316.75
7.4.300.0070.00016.57
7.4.290.0070.00016.87
7.4.280.0000.00816.68
7.4.270.0040.00416.82
7.4.260.0000.00613.51
7.4.250.0040.00416.73
7.4.240.0000.00716.86
7.4.230.0040.00416.62
7.4.220.0110.00716.75
7.4.210.0110.00516.72
7.4.200.0070.00016.55
7.4.190.0000.00716.91
7.4.160.0000.01616.68
7.4.150.0060.01216.86
7.4.140.0110.01116.60
7.4.130.0110.00916.71
7.4.120.0070.01316.90
7.4.110.0070.01016.80
7.4.100.0030.02116.68
7.4.90.0090.00916.73
7.4.80.0130.00916.56
7.4.70.0070.01216.92
7.4.60.0140.00716.60
7.4.50.0000.00516.52
7.4.40.0000.01516.81
7.4.30.0090.00916.83
7.4.00.0030.01315.06
7.3.330.0030.00313.45
7.3.320.0000.00513.60
7.3.310.0000.00716.60
7.3.300.0070.00016.50
7.3.290.0090.00616.55
7.3.280.0090.00716.57
7.3.270.0110.01116.73
7.3.260.0160.00316.75
7.3.250.0070.01116.70
7.3.240.0140.00316.52
7.3.230.0090.00916.60
7.3.210.0120.00616.64
7.3.200.0090.00919.39
7.3.190.0070.01016.93
7.3.180.0060.01016.71
7.3.170.0030.01216.66
7.3.160.0120.00316.72
7.3.120.0070.01015.06
7.3.10.0070.00716.63
7.3.00.0060.00916.49
7.2.330.0090.00916.82
7.2.320.0110.00616.91
7.2.310.0110.00816.88
7.2.300.0170.00416.78
7.2.290.0030.01416.77
7.2.130.0090.00617.15
7.2.120.0110.00416.96
7.2.110.0030.01016.93
7.2.100.0030.01016.85
7.2.90.0040.01217.21
7.2.80.0070.00716.89
7.2.70.0100.00316.88
7.2.60.0030.01016.64
7.2.50.0090.00016.61
7.2.40.0000.01017.17
7.2.30.0070.00717.15
7.2.20.0100.00317.23
7.2.10.0080.00816.88
7.2.00.0110.00417.21
7.1.250.0030.01315.77
7.1.100.0040.00818.64
7.1.70.0030.00617.21
7.1.60.0150.00719.40
7.1.50.0070.01417.11
7.1.00.0000.06722.42
7.0.200.0050.00316.58
7.0.140.0030.07022.12
7.0.120.0000.07322.05
7.0.60.0030.08319.94
7.0.50.0130.05317.95
7.0.40.0030.06019.98
7.0.30.0400.07020.21
7.0.20.0370.06720.07
7.0.10.0130.06720.08
7.0.00.0070.08320.27
5.6.280.0070.06721.09
5.6.210.0170.07720.53
5.6.200.0170.07018.18
5.6.190.0200.07020.67
5.6.180.0430.06320.77
5.6.170.0200.03720.71
5.6.160.0070.03720.57
5.6.150.0030.09018.19
5.6.140.0070.08018.21
5.6.130.0100.07018.14
5.6.120.0130.04721.00
5.6.110.0170.07721.08
5.6.100.0130.07020.98
5.6.90.0230.06320.98
5.6.80.0170.07720.51
5.5.350.4270.04020.52
5.5.340.0100.03317.91
5.5.330.0070.05320.31
5.5.320.0000.08720.30
5.5.310.0370.05720.27
5.5.300.0070.06017.95
5.5.290.0070.03717.95
5.5.280.0100.04320.88
5.5.270.0070.06720.87
5.5.260.0100.08720.73
5.5.250.0130.06720.54
5.5.240.0170.07720.20
5.4.450.3370.04019.27
5.4.440.3670.04019.39
5.4.430.3900.04319.46
5.4.420.3370.04019.38
5.4.410.3730.04019.25
5.4.400.3570.03319.16
5.4.390.2600.03018.98
5.4.380.3500.04018.99
5.4.370.3600.04019.24
5.4.360.3130.04019.15
5.4.350.3400.04318.92
5.4.340.3370.03318.96
5.4.320.3930.04019.22
5.4.310.3570.03718.99
5.4.300.3500.03318.99
5.4.290.3530.03319.24
5.4.280.3330.04018.97
5.4.270.3870.03718.87
5.4.260.3400.03319.22
5.4.250.3770.03318.86
5.4.240.4230.04019.19
5.4.230.4130.03019.18
5.4.220.4370.03318.99
5.4.210.3630.03718.94
5.4.200.3330.03319.15
5.4.190.3470.03319.14
5.4.180.2830.03319.07
5.4.170.4430.03019.15
5.4.160.4330.03718.87
5.4.150.4400.03719.20
5.4.140.4370.03716.46
5.4.130.4200.04016.39
5.4.120.3830.03716.46
5.4.110.4500.04016.40
5.4.100.4400.03716.41
5.4.90.4100.03316.41
5.4.80.3500.04016.36
5.4.70.3600.04016.58
5.4.60.3670.04316.49
5.4.50.4170.03716.51
5.4.40.4030.04316.42
5.4.30.4430.03716.42
5.4.20.0100.06716.34
5.4.10.4200.03316.32
5.4.00.4000.03716.00
5.3.290.3470.02714.63
5.3.280.4200.04014.70
5.3.270.3570.03014.76
5.3.260.4370.04014.50
5.3.250.4000.03714.60
5.3.240.3930.03714.84
5.3.230.3700.03314.52
5.3.220.4130.04014.63
5.3.210.4030.04314.58
5.3.200.4470.03014.47
5.3.190.3970.03314.57
5.3.180.3400.04014.56
5.3.170.3630.03314.54
5.3.160.3670.03714.58
5.3.150.3730.03714.57
5.3.140.3400.04014.67
5.3.130.0030.06314.47
5.3.120.0030.08314.66
5.3.110.2200.05014.47
5.3.100.3100.03014.02
5.3.90.3670.03313.92
5.3.80.3630.03013.96
5.3.70.4170.03313.94
5.3.60.3500.04014.05
5.3.50.3800.03313.85
5.3.40.3630.04314.03
5.3.30.3500.03713.80
5.3.20.3570.03313.80
5.3.10.3630.03313.66
5.3.00.4030.04713.54
5.2.170.2900.03011.05
5.2.160.3130.02311.38
5.2.150.3000.03011.15
5.2.140.3230.02711.07
5.2.130.2900.02711.18
5.2.120.2930.03311.18
5.2.110.3300.03011.17
5.2.100.3300.02711.02
5.2.90.0100.05711.03
5.2.80.0100.03711.14
5.2.70.0130.03311.05
5.2.60.0970.05311.05
5.2.50.3600.03711.07
5.2.40.3070.02711.08
5.2.30.2700.02710.90
5.2.20.3070.02710.88
5.2.10.2500.03010.79
5.2.00.2370.03710.64
5.1.60.2500.0279.88
5.1.50.2530.0239.96
5.1.40.2330.0279.91
5.1.30.2500.02710.26
5.1.20.2900.03310.35
5.1.10.2200.02710.00
5.1.00.2330.02710.15
5.0.50.1130.0208.77
5.0.40.1430.0238.53
5.0.30.1370.0378.12
5.0.20.1400.0238.13
5.0.10.1330.0178.23
5.0.00.1600.0238.24
4.4.90.0070.0337.12
4.4.80.1570.0177.12
4.4.70.1400.0177.12
4.4.60.1400.0177.12
4.4.50.1130.0177.12
4.4.40.1270.0307.12
4.4.30.1370.0177.12
4.4.20.1270.0207.12
4.4.10.1270.0177.12
4.4.00.1170.0277.12
4.3.110.1530.0177.12
4.3.100.1100.0177.12
4.3.90.1430.0137.12
4.3.80.1130.0307.12
4.3.70.1100.0177.12
4.3.60.1170.0207.12
4.3.50.0930.0137.12
4.3.40.0700.0277.12
4.3.30.0570.0137.12
4.3.20.0230.0177.12
4.3.10.0530.0177.12
4.3.00.0300.0177.12

preferences:
60.1 ms | 401 KiB | 5 Q