3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "Zo\u{00EB}"; var_dump($string); echo "\n"; var_dump(substr($string, -1)); var_dump(mb_substr($string, -1)); var_dump(iconv_substr($string, -1)); var_dump(grapheme_substr($string, -1));

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)
8.3.60.0100.01319.39
8.3.50.0140.00719.13
8.3.40.0110.00720.08
8.3.30.0100.00719.78
8.3.20.0050.00324.18
8.3.10.0050.00324.66
8.3.00.0080.00026.16
8.2.180.0060.01225.92
8.2.170.0120.00319.87
8.2.160.0060.01222.96
8.2.150.0040.00425.66
8.2.140.0080.00024.66
8.2.130.0080.00026.16
8.2.120.0000.00721.71
8.2.110.0060.00323.08
8.2.100.0040.00818.78
8.2.90.0060.00318.75
8.2.80.0040.00419.79
8.2.70.0030.00618.80
8.2.60.0090.00019.18
8.2.50.0060.00318.50
8.2.40.0030.00622.07
8.2.30.0040.00420.26
8.2.20.0070.00019.07
8.2.10.0050.00320.08
8.2.00.0000.00720.18
8.1.280.0110.00425.92
8.1.270.0040.00423.99
8.1.260.0080.00826.35
8.1.250.0000.00828.09
8.1.240.0050.00523.01
8.1.230.0070.00418.64
8.1.220.0040.00418.78
8.1.210.0050.00518.77
8.1.200.0080.00618.10
8.1.190.0040.00418.10
8.1.180.0080.00018.40
8.1.170.0060.00319.50
8.1.160.0110.00019.79
8.1.150.0080.00019.60
8.1.140.0080.00021.63
8.1.130.0030.00718.34
8.1.120.0000.00718.32
8.1.110.0000.00818.40
8.1.100.0000.00818.38
8.1.90.0000.00718.36
8.1.80.0070.00018.25
8.1.70.0000.00718.41
8.1.60.0060.00618.54
8.1.50.0000.00918.50
8.1.40.0030.00618.49
8.1.30.0000.00818.59
8.1.20.0030.00518.65
8.1.10.0040.00418.33
8.1.00.0070.00418.47
8.0.300.0040.00819.38
8.0.290.0070.00417.75
8.0.280.0040.00419.43
8.0.270.0070.00019.08
8.0.260.0000.00717.96
8.0.250.0000.00717.86
8.0.240.0060.00317.68
8.0.230.0000.00717.75
8.0.220.0040.00417.73
8.0.210.0030.00517.69
8.0.200.0000.00817.71
8.0.190.0070.00417.83
8.0.180.0040.00417.77
8.0.170.0050.00317.79
8.0.160.0050.00317.72
8.0.150.0040.00417.77
8.0.140.0080.00017.73
8.0.130.0050.00013.34
8.0.120.0060.00317.98
8.0.110.0060.00317.94
8.0.100.0000.00917.93
8.0.90.0000.00917.93
8.0.80.0030.01417.98
8.0.70.0100.01618.09
8.0.60.0160.01017.88
8.0.50.0130.01417.95
8.0.30.0150.01218.04
8.0.20.0140.00318.16
8.0.10.0000.01917.94
8.0.00.0130.01018.07
7.4.330.0040.00015.55
7.4.320.0000.00617.49
7.4.300.0030.00517.41
7.4.290.0030.00517.35
7.4.280.0080.00017.29
7.4.270.0040.00417.37
7.4.260.0040.00413.27
7.4.250.0030.00617.57
7.4.240.0020.00917.64
7.4.230.0030.00617.73
7.4.220.0030.00617.47
7.4.210.0000.01917.48
7.4.200.0120.00617.60
7.4.190.0060.01217.68
7.4.180.0070.01417.58
7.4.160.0150.00917.66
7.4.150.0190.00617.66
7.4.140.0090.01517.54
7.4.130.0080.01617.59
7.4.120.0030.02017.58
7.4.110.0120.01217.50
7.4.100.0160.00317.71
7.4.90.0030.01617.54
7.4.80.0150.00917.45
7.4.70.0060.01217.57
7.4.60.0130.00717.54
7.4.50.0180.00617.47
7.4.40.0130.01017.47
7.4.30.0100.01417.61
7.4.20.0090.00917.57
7.4.10.0090.00917.59
7.4.00.0030.01517.43
7.3.330.0040.00417.16
7.3.320.0050.00013.02
7.3.310.0030.00617.09
7.3.300.0000.00917.26
7.3.290.0070.01217.30
7.3.280.0100.01617.36
7.3.270.0000.01817.38
7.3.260.0060.01917.33
7.3.250.0110.00717.34
7.3.240.0040.01317.26
7.3.230.0100.00717.40
7.3.220.0060.01317.24
7.3.210.0130.00617.14
7.3.200.0090.01017.10
7.3.190.0130.00817.25
7.3.180.0150.00317.16
7.3.170.0180.00017.25
7.3.160.0060.01517.21
7.3.150.0070.01117.14
7.3.140.0060.01317.24
7.3.130.0100.01017.31
7.3.120.0070.01117.16
7.3.110.0030.01317.09
7.3.100.0130.00717.31
7.3.90.0110.00717.43
7.3.80.0030.01317.15
7.3.70.0150.00617.36
7.3.60.0180.00617.42
7.3.50.0040.01817.45
7.3.40.0100.01317.53
7.3.30.0120.00617.44
7.3.20.0040.01817.40
7.3.10.0060.01217.43
7.3.00.0060.01317.34

preferences:
62.52 ms | 400 KiB | 5 Q