3v4l.org

run code in 300+ PHP versions simultaneously
<?php $uuid = sprintf('%04x%04x%04x%04x%04x%04x%04x%04x', // 32 bits for "time_low" mt_rand(0, 0xffff), mt_rand(0, 0xffff), // 16 bits for "time_mid" mt_rand(0, 0xffff), // 16 bits for "time_hi_and_version", // four most significant bits holds version number 4 mt_rand(0, 0x0fff) | 0x4000, // 16 bits, 8 bits for "clk_seq_hi_res", // 8 bits for "clk_seq_low", // two most significant bits holds zero and one // for variant DCE1.1 mt_rand(0, 0x3fff) | 0x8000, // 48 bits for "node" mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff) ); $packedUuid = pack('H*', $uuid); $unpackedUuid = unpack('H*', $packedUuid); var_dump($unpackedUuid); echo $uuid . PHP_EOL; echo strlen($uuid) . PHP_EOL; echo $packedUuid . PHP_EOL; echo strlen($packedUuid) . PHP_EOL; echo $unpackedUuid . PHP_EOL; echo strlen($unpackedUuid) . PHP_EOL;

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)
7.2.00.0030.01019.08
7.1.70.0040.00417.20
7.1.60.0170.00719.82
7.1.50.0070.01016.63
7.1.00.0000.07722.30
7.0.200.0070.00716.52
7.0.140.0030.07021.92
7.0.70.0030.07721.65
7.0.60.0130.07721.56
7.0.50.0130.07322.11
7.0.40.0000.08020.07
7.0.30.0070.08320.11
7.0.20.0000.07020.09
7.0.10.0000.09320.08
7.0.00.0170.07320.17
5.6.280.0000.07721.10
5.6.220.0030.05720.66
5.6.210.0070.08020.63
5.6.200.0070.07721.17
5.6.190.0070.07720.93
5.6.180.0200.07321.16
5.6.170.0000.07721.01
5.6.160.0000.07321.12
5.6.150.0100.07321.02
5.6.140.0000.07321.11
5.6.130.0030.07321.09
5.6.120.0100.07721.16
5.6.110.0030.08721.04
5.6.100.0100.07720.93
5.6.90.0100.07720.91
5.6.80.0100.07720.34
5.6.70.0030.07320.39
5.6.60.0070.06320.38
5.6.50.0030.07720.49
5.6.40.0070.07720.38
5.6.30.0030.07720.43
5.6.20.0030.08020.47
5.6.10.0000.08020.47
5.6.00.0030.08020.32
5.5.360.0100.07720.48
5.5.350.0030.07320.34
5.5.340.0000.07320.82
5.5.330.0070.07720.63
5.5.320.0030.08320.92
5.5.310.0100.06720.82
5.5.300.0070.08020.91
5.5.290.0000.08320.89
5.5.280.0070.07720.63
5.5.270.0000.08720.91
5.5.260.0030.08320.77
5.5.250.0100.07720.61
5.5.240.0030.08020.19
5.5.230.0030.08720.25
5.5.220.0000.08020.23
5.5.210.0070.07720.13
5.5.200.0030.08020.17
5.5.190.0130.06320.22
5.5.180.0030.06320.25
5.5.160.0030.08020.14
5.5.150.0100.06720.21
5.5.140.0030.07720.25
5.5.130.0070.08320.25
5.5.120.0100.07020.23
5.5.110.0100.06720.07
5.5.100.0030.08019.97
5.5.90.0030.06720.00
5.5.80.0030.07320.14
5.5.70.0000.08320.13
5.5.60.0000.08320.12
5.5.50.0000.07719.95
5.5.40.0070.07320.08
5.5.30.0030.07719.98
5.5.20.0030.08320.08
5.5.10.0000.07720.02
5.5.00.0030.07720.03
5.4.450.0030.08019.41
5.4.440.0030.05719.13
5.4.430.0030.07719.34
5.4.420.0030.07719.35
5.4.410.0100.06719.25
5.4.400.0070.07318.77
5.4.390.0030.06319.13
5.4.380.0000.08319.02
5.4.370.0070.07019.03
5.4.360.0100.06718.96
5.4.350.0030.08019.09
5.4.340.0000.07718.95
5.4.320.0070.07318.77
5.4.310.0030.04319.11
5.4.300.0000.04019.12
5.4.290.0030.07019.20
5.4.280.0030.08318.79
5.4.270.0030.07718.95
5.4.260.0070.07719.10
5.4.250.0030.08019.10
5.4.240.0000.08718.93
5.4.230.0000.08719.00
5.4.220.0130.07019.05
5.4.210.0130.07018.76
5.4.200.0030.08019.17
5.4.190.0030.07719.12
5.4.180.0030.07719.03
5.4.170.0070.07718.96
5.4.160.0030.06718.78
5.4.150.0070.07318.87
5.4.140.0030.07316.22
5.4.130.0070.07016.20
5.4.120.0100.06716.00
5.4.110.0100.07016.40
5.4.100.0070.07016.31
5.4.90.0070.07016.21
5.4.80.0100.06716.24
5.4.70.0000.07716.27
5.4.60.0030.07016.36
5.4.50.0100.06316.30
5.4.40.0000.07716.31
5.4.30.0130.06316.30
5.4.20.0030.07016.38
5.4.10.0100.06716.21
5.4.00.0000.07015.75
5.3.290.0030.07014.50
5.3.280.0070.07314.58
5.3.270.0070.07014.57
5.3.260.0000.07314.57
5.3.250.0070.07314.60
5.3.240.0030.07714.59
5.3.230.0070.07314.57
5.3.220.0000.07314.53
5.3.210.0030.07714.54
5.3.200.0000.08314.54
5.3.190.0070.07014.41
5.3.180.0030.07014.58
5.3.170.0030.07314.57
5.3.160.0100.07314.51
5.3.150.0000.07714.44
5.3.140.0000.07714.57
5.3.130.0000.07714.52
5.3.120.0030.07714.39
5.3.110.0070.07714.54
5.3.100.0030.06313.98
5.3.90.0070.07013.98
5.3.80.0030.07313.88
5.3.70.0030.07313.79
5.3.60.0000.07014.01
5.3.50.0070.07313.90
5.3.40.0100.06713.90
5.3.30.0100.05313.88
5.3.20.0030.06713.56
5.3.10.0030.06713.65
5.3.00.0070.06713.65
5.2.170.0030.05012.52
5.2.160.0000.04712.52
5.2.150.0070.06012.52
5.2.140.0100.05312.52
5.2.130.0030.06312.52
5.2.120.0070.06012.52
5.2.110.0000.06712.52
5.2.100.0070.06012.52
5.2.90.0030.05712.52
5.2.80.0000.06712.52
5.2.70.0030.06012.52
5.2.60.0000.06712.52
5.2.50.0000.06312.52
5.2.40.0030.05312.52
5.2.30.0070.05712.52
5.2.20.0030.06012.52
5.2.10.0030.04712.52
5.2.00.0000.03712.52
5.1.60.0030.02312.52
5.1.50.0030.02312.52
5.1.40.0030.02012.52
5.1.30.0000.02712.52
5.1.20.0030.02312.52
5.1.10.0000.02712.52
5.1.00.0000.02712.52
5.0.50.0000.02012.52
5.0.40.0000.02312.52
5.0.30.0030.02312.52
5.0.20.0000.01712.52
5.0.10.0030.01712.52
5.0.00.0000.02712.52
4.4.90.0070.02712.52
4.4.80.0000.03712.52
4.4.70.0070.03312.52
4.4.60.0070.03312.52
4.4.50.0000.04012.52
4.4.40.0000.02712.52
4.4.30.0030.01312.52
4.4.20.0030.01312.52
4.4.10.0000.01712.52
4.4.00.0000.02312.52
4.3.110.0000.01312.52
4.3.100.0000.01012.52
4.3.90.0000.01312.52
4.3.80.0000.02312.52
4.3.70.0000.01712.52
4.3.60.0000.02012.52
4.3.50.0000.01712.52
4.3.40.0030.02712.52
4.3.30.0000.01312.52
4.3.20.0030.01312.52
4.3.10.0000.01312.52
4.3.00.0030.01312.52

preferences:
36.03 ms | 401 KiB | 5 Q