3v4l.org

run code in 300+ PHP versions simultaneously
<?php function cn_substr_utf8($str, $start=0,$length) { 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,0,6,'utf-8'); 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)
8.3.40.0120.00319.04
8.3.30.0070.00719.04
8.3.20.0050.00220.34
8.3.10.0080.00023.45
8.3.00.0040.00419.63
8.2.170.0150.00622.96
8.2.160.0070.00720.52
8.2.150.0040.00424.18
8.2.140.0080.00024.66
8.2.130.0080.00026.16
8.2.120.0040.00422.11
8.2.110.0030.00622.39
8.2.100.0070.00417.97
8.2.90.0040.00419.08
8.2.80.0030.00617.97
8.2.70.0060.00317.88
8.2.60.0050.00317.93
8.2.50.0040.00418.07
8.2.40.0040.00420.13
8.2.30.0040.00418.13
8.2.20.0050.00217.88
8.2.10.0040.00418.01
8.2.00.0030.00817.87
8.1.270.0090.00023.82
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0060.00323.85
8.1.230.0110.00019.09
8.1.220.0040.00417.74
8.1.210.0060.00318.77
8.1.200.0070.00317.47
8.1.190.0040.00717.13
8.1.180.0040.00419.01
8.1.170.0030.00618.58
8.1.160.0040.00421.84
8.1.150.0040.00418.62
8.1.140.0040.00417.46
8.1.130.0000.00717.87
8.1.120.0000.00817.59
8.1.110.0000.00717.54
8.1.100.0080.00017.59
8.1.90.0000.00817.64
8.1.80.0000.00717.52
8.1.70.0030.00317.53
8.1.60.0030.00617.72
8.1.50.0050.00317.73
8.1.40.0040.00417.74
8.1.30.0040.00417.77
8.1.20.0000.00717.75
8.1.10.0060.00317.71
8.1.00.0040.00417.59
8.0.300.0050.00318.77
8.0.290.0050.00217.30
8.0.280.0000.00718.39
8.0.270.0000.00717.11
8.0.260.0030.00317.23
8.0.250.0070.00017.20
8.0.240.0070.00017.15
8.0.230.0070.00017.11
8.0.220.0030.00317.11
8.0.210.0000.00717.12
8.0.200.0030.00317.20
8.0.190.0040.00417.16
8.0.180.0040.00417.18
8.0.170.0030.00617.03
8.0.160.0050.00217.04
8.0.150.0000.00716.98
8.0.140.0080.00017.11
8.0.130.0050.00213.54
8.0.120.0040.00417.08
8.0.110.0000.00717.17
8.0.100.0000.00717.02
8.0.90.0040.00417.12
8.0.80.0000.01817.13
8.0.70.0050.00317.16
8.0.60.0000.00717.03
8.0.50.0040.00416.93
8.0.30.0130.01117.18
8.0.20.0080.01017.47
8.0.10.0040.00417.23
8.0.00.0120.00817.04
7.4.330.0020.00215.00
7.4.320.0030.00316.57
7.4.300.0000.00616.79
7.4.290.0050.00216.89
7.4.280.0060.00316.75
7.4.270.0040.00416.83
7.4.260.0030.00316.77
7.4.250.0040.00416.75
7.4.240.0000.00716.68
7.4.230.0030.00316.86
7.4.220.0100.00716.73
7.4.210.0090.00716.78
7.4.200.0000.00716.63
7.4.190.0030.00316.70
7.4.160.0110.00516.59
7.4.150.0190.00017.40
7.4.140.0080.01117.86
7.4.130.0070.01316.73
7.4.120.0070.01016.92
7.4.110.0060.01116.55
7.4.100.0100.00716.61
7.4.90.0130.00316.75
7.4.80.0030.01919.39
7.4.70.0080.00816.70
7.4.60.0150.00316.68
7.4.50.0030.00516.55
7.4.40.0100.00616.60
7.4.30.0030.01416.70
7.4.00.0070.01114.91
7.3.330.0060.00013.59
7.3.320.0030.00313.58
7.3.310.0000.00716.62
7.3.300.0030.00316.40
7.3.290.0140.01116.56
7.3.280.0130.00516.55
7.3.270.0090.00917.40
7.3.260.0040.01416.53
7.3.250.0080.01016.67
7.3.240.0090.00616.78
7.3.230.0090.01216.77
7.3.210.0100.00716.64
7.3.200.0060.01619.39
7.3.190.0070.01516.84
7.3.180.0070.00916.55
7.3.170.0090.00616.70
7.3.160.0060.01316.63
7.3.120.0080.00415.03
7.2.330.0100.01016.93
7.2.320.0050.01316.87
7.2.310.0000.01716.86
7.2.300.0100.01016.96
7.2.290.0060.01816.73
7.2.60.0070.00717.32
7.1.200.0040.00816.13
7.1.70.0000.00817.38
7.1.60.0130.01019.46
7.1.50.0090.00617.18
7.1.00.0030.07322.58
7.0.200.0000.00717.02
7.0.140.0000.07321.95
7.0.110.0100.08019.95
7.0.100.0600.06319.97
7.0.90.0530.08319.98
7.0.80.0470.04319.95
7.0.70.0600.04320.01
7.0.60.0700.07320.01
7.0.50.0630.06719.96
7.0.40.0000.05319.73
7.0.30.0100.04719.70
7.0.20.0070.08719.65
7.0.10.0100.07719.70
7.0.00.0070.08019.88
5.6.280.0030.07321.12
5.6.260.0030.07720.56
5.6.250.0130.07320.70
5.6.240.0070.05320.56
5.6.230.0130.07020.55
5.6.220.0100.06720.65
5.6.210.0130.07320.71
5.6.200.0070.08320.64
5.6.190.0200.05720.62
5.6.180.0030.08720.58
5.6.170.0030.03720.46
5.6.160.0070.07720.65
5.6.150.0000.04020.66
5.6.140.0070.08320.62
5.6.130.0100.07720.55
5.6.120.0170.07020.59
5.6.110.0070.07320.63
5.6.100.0130.03320.63
5.6.90.0030.08020.63
5.6.80.0070.06020.00
5.6.70.0100.06720.07
5.6.60.0100.07720.04
5.6.50.0100.06320.24
5.6.40.0000.04719.91
5.6.30.0100.07319.95
5.6.20.0100.04319.98
5.6.10.0030.07720.01
5.6.00.0100.06320.21
5.5.380.0070.06717.70
5.5.370.0070.04317.73
5.5.360.0030.05017.55
5.5.350.0100.08017.59
5.5.340.0100.08018.13
5.5.330.0100.07718.15
5.5.320.0000.07717.95
5.5.310.0100.06717.91
5.5.300.0000.08317.93
5.5.290.0130.06717.82
5.5.280.0030.04317.91
5.5.270.0200.06717.92
5.5.260.0130.07317.95
5.5.250.0100.08317.71
5.5.240.0070.07317.32
5.5.230.0030.08017.50
5.5.220.0000.08017.30
5.5.210.0130.05717.61
5.5.200.0100.06717.27
5.5.190.0070.06317.59
5.5.180.0070.04317.43
5.5.160.0170.04717.43
5.5.150.0000.08017.28
5.5.140.0100.04317.60
5.5.130.0100.07017.45
5.5.120.0100.07717.30
5.5.110.0130.06017.39
5.5.100.0070.07717.51
5.5.90.0030.04317.20
5.5.80.0170.06717.47
5.5.70.0130.07017.34
5.5.60.0100.07017.50
5.5.50.0100.06317.36
5.5.40.0130.07017.29
5.5.30.0100.06717.33
5.5.20.0130.07017.18
5.5.10.0100.04017.46
5.5.00.0030.04717.32
5.4.450.0100.07319.34
5.4.440.0030.04719.53
5.4.430.0030.08019.32
5.4.420.0030.08319.32
5.4.410.0000.08019.34
5.4.400.0100.04019.24
5.4.390.0070.07719.04
5.4.380.0070.08718.95
5.4.370.0070.08719.02
5.4.360.0030.07719.16
5.4.350.0000.06019.28
5.4.340.0100.05019.38
5.4.320.0030.07318.95
5.4.310.0030.07019.04
5.4.300.0030.08019.00
5.4.290.0130.06719.19
5.4.280.0100.07318.95
5.4.270.0130.05719.22
5.4.260.0000.04719.24
5.4.250.0030.08019.22
5.4.240.0000.04019.17
5.4.230.0100.07718.94
5.4.220.0070.04318.94
5.4.210.0070.04319.33
5.4.200.0030.07319.00
5.4.190.0000.04319.34
5.4.180.0030.06019.08
5.4.170.0030.04719.00
5.4.160.0030.07318.93
5.4.150.0100.07718.99
5.4.140.0000.07716.63
5.4.130.0000.04316.31
5.4.120.0070.03316.62
5.4.110.0170.04716.57
5.4.100.0070.07316.43
5.4.90.0070.06716.71
5.4.80.0030.04316.46
5.4.70.0030.07316.50
5.4.60.0130.06316.34
5.4.50.0070.04316.41
5.4.40.0170.06016.61
5.4.30.0070.05716.46
5.4.20.0100.06016.44
5.4.10.0030.08016.54
5.4.00.0070.06716.04
5.3.290.0070.08014.55
5.3.280.0170.06714.73
5.3.270.0100.06314.61
5.3.260.0030.07714.73
5.3.250.0170.06714.83
5.3.240.0100.06314.46
5.3.230.0100.06014.63
5.3.220.0030.06714.57
5.3.210.0030.07014.70
5.3.200.0070.06714.70
5.3.190.0070.07714.59
5.3.180.0000.07714.69
5.3.170.0030.04314.58
5.3.160.0070.06714.58
5.3.150.0130.03314.58
5.3.140.0070.06714.63
5.3.130.0000.08014.55
5.3.120.0030.04714.53
5.3.110.0100.04314.69
5.3.100.0030.07314.13
5.3.90.0130.06314.18
5.3.80.0000.07714.10
5.3.70.0030.08014.04
5.3.60.0130.06014.01
5.3.50.0130.03313.95
5.3.40.0100.07013.94
5.3.30.0100.07013.93
5.3.20.0030.05713.54
5.3.10.0030.04313.70
5.3.00.0100.06313.71
5.2.170.0030.06712.16
5.2.160.0070.06012.16
5.2.150.0070.05312.16
5.2.140.0070.05712.16
5.2.130.0030.03712.16
5.2.120.0100.05312.16
5.2.110.0030.03712.16
5.2.100.0070.06012.16
5.2.90.0070.03012.16
5.2.80.0100.05712.16
5.2.70.0130.03312.16
5.2.60.0070.06012.16
5.2.50.0070.03312.16
5.2.40.0070.05312.16
5.2.30.0070.05312.16
5.2.20.0030.05712.16
5.2.10.0030.06012.16
5.2.00.0030.05312.16
5.1.60.0100.05012.16
5.1.50.0030.05312.16
5.1.40.0100.04012.16
5.1.30.0100.05012.16
5.1.20.0130.04712.16
5.1.10.0000.05312.16
5.1.00.0070.04712.16
5.0.50.0000.04012.16
5.0.40.0070.04012.16
5.0.30.0000.06712.16
5.0.20.0070.03712.16
5.0.10.0030.02712.16
5.0.00.0030.05012.16
4.4.90.0000.03312.16
4.4.80.0030.03712.16
4.4.70.0070.03012.16
4.4.60.0030.03312.16
4.4.50.0030.03312.16
4.4.40.0030.04712.16
4.4.30.0030.03012.16
4.4.20.0030.03312.16
4.4.10.0000.03712.16
4.4.00.0000.04712.16
4.3.110.0000.02712.16
4.3.100.0000.03712.16
4.3.90.0000.03312.16
4.3.80.0000.05312.16
4.3.70.0000.03312.16
4.3.60.0000.03312.16
4.3.50.0000.03312.16
4.3.40.0030.05012.16
4.3.30.0000.02312.16
4.3.20.0000.02012.16
4.3.10.0030.03012.16
4.3.00.0000.03312.16

preferences:
43.3 ms | 400 KiB | 5 Q