3v4l.org

run code in 300+ PHP versions simultaneously
<?php function cn_substr_utf8($str, $length, $start=0) { if(strlen($str) < $start+1) { return ''; } preg_match_all("/./su", $str, $ar); $str = ''; $tstr = ''; //为了兼容mysql教程4.1以下版本,与数据库教程varchar一致,这里使用按字节截取 for($i=0; isset($ar[0][$i]); $i++) { if(strlen($tstr) < $start) { $tstr .= $ar[0][$i]; } else { if(strlen($str) < $length + strlen($ar[0][$i]) ) { $str .= $ar[0][$i]; } else { break; } } } return $str; } $a = '测试这是一个测试'; //$a = 'xxxxbbbbbnnn'; $b = cn_substr_utf8($a,5,0); 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)
8.3.60.0100.01018.68
8.3.50.0110.00822.22
8.3.40.0140.00718.95
8.3.30.0170.00318.92
8.3.20.0000.00820.17
8.3.10.0070.00021.96
8.3.00.0000.00822.33
8.2.180.0110.00716.63
8.2.170.0140.00422.96
8.2.160.0070.00721.11
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0140.00426.16
8.2.120.0080.00017.88
8.2.110.0030.00621.04
8.2.100.0040.00717.97
8.2.90.0050.00318.28
8.2.80.0090.00018.09
8.2.70.0040.00417.80
8.2.60.0000.00917.92
8.2.50.0050.00318.10
8.2.40.0060.00320.55
8.2.30.0070.00019.49
8.2.20.0070.00017.84
8.2.10.0050.00319.69
8.2.00.0070.00017.99
8.1.280.0120.00925.92
8.1.270.0050.00322.13
8.1.260.0000.00726.35
8.1.250.0030.01028.09
8.1.240.0040.00423.84
8.1.230.0040.00822.79
8.1.220.0000.00817.74
8.1.210.0040.00418.79
8.1.200.0110.00017.48
8.1.190.0060.00317.35
8.1.180.0030.00518.10
8.1.170.0090.00018.67
8.1.160.0000.00822.23
8.1.150.0000.00818.79
8.1.140.0000.00817.45
8.1.130.0030.00517.82
8.1.120.0030.00317.44
8.1.110.0000.00917.45
8.1.100.0030.00517.48
8.1.90.0040.00417.54
8.1.80.0040.00417.54
8.1.70.0030.00317.53
8.1.60.0060.00317.72
8.1.50.0040.00417.66
8.1.40.0070.00017.68
8.1.30.0040.00417.72
8.1.20.0030.00517.87
8.1.10.0040.00417.74
8.1.00.0040.00417.54
8.0.300.0000.00819.86
8.0.290.0000.00716.63
8.0.280.0080.00018.47
8.0.270.0000.00817.25
8.0.260.0000.00717.00
8.0.250.0070.00017.17
8.0.240.0050.00217.11
8.0.230.0040.00416.98
8.0.220.0000.00717.16
8.0.210.0000.00717.09
8.0.200.0040.00417.04
8.0.190.0080.00017.11
8.0.180.0040.00417.07
8.0.170.0000.00717.05
8.0.160.0040.00416.94
8.0.150.0000.00717.01
8.0.140.0070.00017.00
8.0.130.0000.00513.49
8.0.120.0000.00817.07
8.0.110.0000.00817.07
8.0.100.0040.00416.95
8.0.90.0040.00416.97
8.0.80.0080.00817.01
8.0.70.0000.00717.13
8.0.60.0040.00416.94
8.0.50.0080.00016.93
8.0.30.0110.01017.07
8.0.20.0080.01317.40
8.0.10.0030.00517.04
8.0.00.0090.00917.01
7.4.330.0000.00715.04
7.4.320.0000.00616.77
7.4.300.0030.00316.75
7.4.290.0020.00516.68
7.4.280.0030.00316.76
7.4.270.0000.00816.84
7.4.260.0060.00316.78
7.4.250.0040.00416.61
7.4.240.0020.00616.83
7.4.230.0070.00016.49
7.4.220.0090.01516.88
7.4.210.0090.00516.81
7.4.200.0030.00616.83
7.4.190.0030.00316.80
7.4.160.0090.00916.58
7.4.150.0080.00917.40
7.4.140.0110.00917.86
7.4.130.0100.00916.76
7.4.120.0080.00816.66
7.4.110.0100.00716.69
7.4.100.0110.00716.68
7.4.90.0130.00616.75
7.4.80.0070.01019.39
7.4.70.0110.00716.85
7.4.60.0060.00916.77
7.4.50.0070.00016.67
7.4.40.0000.01122.77
7.4.30.0100.00616.90
7.4.00.0060.00915.25
7.3.330.0000.00513.59
7.3.320.0050.00013.55
7.3.310.0030.00316.60
7.3.300.0040.00416.48
7.3.290.0060.00916.59
7.3.280.0090.00716.61
7.3.270.0070.01417.40
7.3.260.0170.00016.54
7.3.250.0110.01016.66
7.3.240.0160.00816.73
7.3.230.0120.00416.76
7.3.210.0030.01516.86
7.3.200.0110.01119.39
7.3.190.0060.01516.49
7.3.180.0110.00616.54
7.3.170.0110.00716.72
7.3.160.0030.01316.54
7.3.120.0000.01215.06
7.2.330.0060.01117.01
7.2.320.0140.00316.76
7.2.310.0080.01317.03
7.2.300.0060.00916.78
7.2.290.0040.01216.99
7.2.00.0060.00619.70
7.1.100.0040.00818.29
7.1.70.0050.00217.29
7.1.60.0060.01619.82
7.1.50.0000.01317.30
7.1.00.0070.07322.34
7.0.200.0040.00416.60
7.0.140.0030.07322.00
7.0.100.0100.04720.09
7.0.90.0070.04019.91
7.0.80.0070.08719.95
7.0.70.0230.07319.98
7.0.60.0130.06720.05
7.0.50.0030.08020.30
7.0.40.0070.06320.07
7.0.30.0070.06720.11
7.0.20.0030.04020.00
7.0.10.0100.07320.02
7.0.00.0030.09320.13
5.6.280.0070.09321.10
5.6.250.0100.07720.76
5.6.240.0070.03720.68
5.6.230.0030.07020.72
5.6.220.0070.04320.57
5.6.210.0100.08320.46
5.6.200.0230.03020.96
5.6.190.0070.08721.02
5.6.180.0200.06320.96
5.6.170.0170.03721.02
5.6.160.0070.04021.11
5.6.150.0170.07021.06
5.6.140.0100.08720.94
5.6.130.0170.07021.01
5.6.120.0000.09020.96
5.6.110.0170.05321.16
5.6.100.0070.07721.04
5.6.90.0130.07720.91
5.6.80.0070.04720.56
5.6.70.0100.04020.46
5.6.60.0170.04320.39
5.6.50.0100.04320.47
5.6.40.0130.07020.36
5.6.30.0030.07020.53
5.6.20.0100.07320.31
5.6.10.0200.06720.40
5.6.00.0100.06020.39
5.5.380.0170.07720.42
5.5.370.0030.04320.39
5.5.360.0070.03720.44
5.5.350.0070.08020.43
5.5.340.0100.04320.88
5.5.330.0100.07720.76
5.5.320.0030.09320.75
5.5.310.0100.07720.79
5.5.300.0070.05720.63
5.5.290.0170.05320.83
5.5.280.0070.04320.78
5.5.270.0070.08720.77
5.5.260.0100.08720.72
5.5.250.0130.08020.70
5.5.240.0230.04720.11
5.5.230.0130.06320.02
5.5.220.0070.08320.02
5.5.210.0130.07020.24
5.5.200.0130.07320.11
5.5.190.0100.08020.04
5.5.180.0070.06720.26
5.5.160.0030.07019.99
5.5.150.0070.06720.07
5.5.140.0200.07020.16
5.5.130.0030.08020.25
5.5.120.0100.06320.13
5.5.110.0030.08020.10
5.5.100.0130.07020.13
5.5.90.0100.07320.09
5.5.80.0100.07720.07
5.5.70.0070.07720.09
5.5.60.0000.04720.08
5.5.50.0130.07720.16
5.5.40.0200.07020.05
5.5.30.0030.06020.00
5.5.20.0030.04320.00
5.5.10.0100.07019.98
5.5.00.0000.05320.05
5.4.450.0100.03019.45
5.4.440.0070.07319.43
5.4.430.0100.07719.32
5.4.420.0030.05019.35
5.4.410.0200.04019.05
5.4.400.0130.05319.22
5.4.390.0070.04319.03
5.4.380.0130.06719.07
5.4.370.0070.04018.90
5.4.360.0170.04719.13
5.4.350.0030.06719.21
5.4.340.0030.08318.95
5.4.320.0030.08018.93
5.4.310.0070.07719.14
5.4.300.0030.04719.13
5.4.290.0100.07719.17
5.4.280.0100.07719.23
5.4.270.0070.04719.12
5.4.260.0030.04719.22
5.4.250.0030.05319.06
5.4.240.0100.07319.22
5.4.230.0000.04318.87
5.4.220.0100.04718.94
5.4.210.0030.07319.11
5.4.200.0130.06719.08
5.4.190.0130.06319.03
5.4.180.0030.04718.84
5.4.170.0100.07319.11
5.4.160.0070.05019.06
5.4.150.0070.05019.02
5.4.140.0070.04016.40
5.4.130.0030.07016.46
5.4.120.0100.06316.19
5.4.110.0070.07016.41
5.4.100.0030.04316.48
5.4.90.0070.03316.45
5.4.80.0030.03716.49
5.4.70.0070.04016.39
5.4.60.0000.04316.40
5.4.50.0000.04016.47
5.4.40.0030.03716.36
5.4.30.0030.03316.46
5.4.20.0000.03716.46
5.4.10.0030.03016.39
5.4.00.0000.03315.70
5.3.290.0170.05014.59
5.3.280.0100.06714.71
5.3.270.0000.04714.55
5.3.260.0070.08014.54
5.3.250.0030.06014.70
5.3.240.0000.04714.65
5.3.230.0030.06314.69
5.3.220.0100.06014.55
5.3.210.0030.06714.64
5.3.200.0100.05014.58
5.3.190.0070.03714.52
5.3.180.0100.07014.55
5.3.170.0000.05014.62
5.3.160.0030.04014.68
5.3.150.0030.04014.65
5.3.140.0030.03714.52
5.3.130.0000.04714.57
5.3.120.0070.03314.49
5.3.110.0000.04014.47
5.3.100.0100.02714.01
5.3.90.0000.03713.97
5.3.80.0030.03314.05
5.3.70.0030.04013.96
5.3.60.0070.03014.12
5.3.50.0000.04014.05
5.3.40.0070.02714.09
5.3.30.0070.02714.01
5.3.20.0030.03013.68
5.3.10.0000.03013.63
5.3.00.0000.03313.64
5.2.170.0030.02312.32
5.2.160.0030.02312.32
5.2.150.0000.02712.32
5.2.140.0070.02012.32
5.2.130.0000.02712.32
5.2.120.0070.02312.32
5.2.110.0000.02712.32
5.2.100.0070.02012.32
5.2.90.0070.03312.32
5.2.80.0000.02712.32
5.2.70.0070.02312.32
5.2.60.0070.02012.32
5.2.50.0030.02312.32
5.2.40.0030.04712.32
5.2.30.0000.03012.32
5.2.20.0070.02012.32
5.2.10.0030.02712.32
5.2.00.0000.02712.32
5.1.60.0000.02712.32
5.1.50.0070.01712.32
5.1.40.0000.02012.32
5.1.30.0000.02312.32
5.1.20.0130.01712.32
5.1.10.0030.02312.32
5.1.00.0000.02712.32
5.0.50.0000.02312.32
5.0.40.0000.02012.32
5.0.30.0030.02312.32
5.0.20.0000.02012.32
5.0.10.0030.01712.32
5.0.00.0000.02712.32
4.4.90.0000.01312.32
4.4.80.0000.01312.32
4.4.70.0000.01712.32
4.4.60.0070.01312.32
4.4.50.0030.01712.32
4.4.40.0030.01712.32
4.4.30.0000.01712.32
4.4.20.0000.01312.32
4.4.10.0030.01312.32
4.4.00.0030.02312.32
4.3.110.0000.01312.32
4.3.100.0000.01712.32
4.3.90.0030.01012.32
4.3.80.0030.01712.32
4.3.70.0030.01012.32
4.3.60.0030.01012.32
4.3.50.0000.01712.32
4.3.40.0000.02312.32
4.3.30.0000.01312.32
4.3.20.0000.01712.32
4.3.10.0000.01712.32
4.3.00.0000.01312.32

preferences:
42.7 ms | 401 KiB | 5 Q