3v4l.org

run code in 300+ PHP versions simultaneously
<?php function generator($array, $prefix) { foreach ($array as $k => $v) { yield $prefix . $k => $v; } } function generatorPrefix($array, $prefix = 'prefix') { return iterator_to_array(generator($array, $prefix)); } function constructPrefix($array, $prefix = 'prefix') { // 1 loop over data $result = []; foreach ($array as $k => $v) { $result[$prefix . $k] = $v; } return $result; } function mapKeyAndCombinePrefix($array, $prefix = 'prefix') { // 3 loops over data return array_combine( array_map( fn($k) => $prefix . $k, array_keys($array) ), $array ); } function substrReplaceAndCombinePrefix($array, $prefix = 'prefix') { // 3 loops over data return array_combine( substr_replace(array_keys($array), $prefix, 0, 0), $array ); } function walkPrefix($array, $prefix = 'prefix') { // 1 loop over data $result = []; array_walk( $array, function($v, $k, $prefix) use (&$result) { $result[$prefix . $k] = $v; }, $prefix ); return $result; } function reducePrefix($array, $prefix = 'prefix') { // 2 loops over data return array_reduce( array_keys($array), function($result, $k) use ($array, $prefix) { $result[$prefix . $k] = $array[$k]; return $result; }, [] ); } function returnTime(callable $function, int $repeat = 20) { $tests = []; for ($i = 0; $i < $repeat; ++$i) { $startTime = microtime(true); $function(); $endTime = microtime(true); $tests[] = $endTime - $startTime; } // Representing the average return 1000 * array_sum($tests) / $repeat; } $array = range(0, 2000); foreach (['substrReplaceAndCombinePrefix', 'constructPrefix', 'mapKeyAndCombinePrefix', 'generatorPrefix', 'walkPrefix', 'reducePrefix'] as $test) { echo "Duration of $test: ", returnTime(fn() => $test($array)) . 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)
8.3.40.0170.27120.02
8.3.30.0080.28719.50
8.3.20.0080.28222.21
8.3.10.0170.26422.28
8.3.00.0120.26622.21
8.2.170.0130.27319.37
8.2.160.0170.27920.43
8.2.150.0170.27119.69
8.2.140.0100.27120.96
8.2.130.0120.28120.82
8.2.120.0100.26920.87
8.2.110.0100.26319.71
8.2.100.0120.25519.78
8.2.90.0080.25819.37
8.2.80.0150.28519.71
8.2.70.0170.25519.29
8.2.60.0150.27619.31
8.2.50.0130.27819.70
8.2.40.0120.28219.23
8.2.30.0070.27419.07
8.2.20.0150.26319.18
8.2.10.0150.27019.29
8.2.00.0080.26919.20
8.1.270.0130.26422.53
8.1.260.0130.25722.60
8.1.250.0100.27222.59
8.1.240.0080.27019.03
8.1.230.0130.25819.22
8.1.220.0100.26919.40
8.1.210.0100.26619.00
8.1.200.0120.26522.69
8.1.190.0100.27019.10
8.1.180.0120.26118.98
8.1.170.0120.26519.34
8.1.160.0130.24519.08
8.1.150.0070.26619.29
8.1.140.0130.25920.52
8.1.130.0130.26519.22
8.1.120.0130.27019.02
8.1.110.0170.28118.98
8.1.100.0080.27920.16
8.1.90.0170.26619.14
8.1.80.0100.25820.23
8.1.70.0130.25319.34
8.1.60.0080.24919.12
8.1.50.0070.26119.08
8.1.40.0130.24919.12
8.1.30.0100.27119.37
8.1.20.0080.27020.38
8.1.10.0100.26219.17
8.1.00.0070.26519.01
8.0.300.0130.25618.45
8.0.290.0330.23918.21
8.0.280.0270.28718.39
8.0.270.0200.24118.31
8.0.260.0300.25318.30
8.0.250.0360.29018.46
8.0.240.0270.24918.39
8.0.230.0240.25918.36
8.0.220.0200.28118.38
8.0.210.0230.26818.29
8.0.200.0300.26618.22
8.0.190.0270.26818.45
8.0.180.0070.26618.37
8.0.170.0300.28318.46
8.0.160.0200.27918.34
8.0.150.0330.26618.26
8.0.140.0200.27118.37
8.0.130.0260.26118.28
8.0.120.0230.26418.38
8.0.110.0260.24718.36
8.0.100.0170.24918.30
8.0.90.0270.26218.18
8.0.80.0270.33018.20
8.0.70.0130.26619.70
8.0.60.0270.25818.23
8.0.50.0370.26418.28
8.0.30.0100.26119.87
8.0.20.0170.27218.38
8.0.10.0240.24918.55
8.0.00.0230.27121.62
7.4.330.0170.24319.25
7.4.320.0260.25218.14
7.4.300.0450.26317.91
7.4.290.0270.24617.77
7.4.280.0430.24918.00
7.4.270.0300.28117.84
7.4.260.0300.26218.02
7.4.250.0230.25017.92
7.4.240.0200.27117.92
7.4.230.0300.24817.89
7.4.220.0420.25117.88
7.4.210.0240.24918.15
7.4.200.0450.25717.92
7.4.190.0340.25018.06
7.4.180.0260.24018.44
7.4.160.0360.25417.99
7.4.150.0270.27417.84
7.4.140.0130.26017.68
7.4.130.0360.26217.89
7.4.120.0330.25218.04
7.4.110.0290.25817.90
7.4.100.0330.24517.77
7.4.90.0290.24818.04
7.4.80.0270.24917.87
7.4.70.0330.30718.02
7.4.60.0240.27517.94
7.4.50.0200.30517.75
7.4.40.0230.31317.74
7.4.30.0230.30118.14
7.4.20.0230.27017.78
7.4.10.0230.24618.04
7.4.00.0200.28217.77
7.3.330.0230.00717.36
7.3.320.0120.01916.94
7.3.310.0190.00917.19
7.3.300.0270.00017.61
7.3.290.0280.00017.07
7.3.280.0360.00316.90
7.3.270.0360.00316.81
7.3.260.0280.01117.18
7.3.250.0350.00317.11
7.3.240.0330.01117.01
7.3.230.0280.01016.79
7.3.220.0250.01616.89
7.3.210.0360.00417.13
7.3.200.0310.00917.05
7.3.190.0260.00917.08
7.3.180.0280.00916.71
7.3.170.0300.00717.73
7.3.160.0350.00817.03
7.3.150.0390.00616.80
7.3.140.0390.00016.91
7.3.130.0170.01317.14
7.3.120.0260.00917.11
7.3.110.0270.00817.46
7.3.100.0270.01116.93
7.3.90.0310.00917.49
7.3.80.0360.00416.84
7.3.70.0230.00817.88
7.3.60.0310.00817.08
7.3.50.0350.00417.15
7.3.40.0350.00416.84
7.3.30.0330.00616.92
7.3.20.0310.01018.86
7.3.10.0330.00718.98
7.3.00.0260.01518.80
7.2.340.0350.01016.58
7.2.330.0360.00716.62
7.2.320.0310.00816.99
7.2.310.0310.00416.75
7.2.300.0220.00616.89
7.2.290.0220.00617.26
7.2.280.0220.00617.27
7.2.270.0240.00417.18
7.2.260.0220.00717.26
7.2.250.0270.00017.05
7.2.240.0150.01217.06
7.2.230.0330.00617.04
7.2.220.0270.01017.25
7.2.210.0190.01517.06
7.2.200.0330.00717.37
7.2.190.0210.00617.34
7.2.180.0210.00717.38
7.2.170.0260.01317.00
7.2.160.0170.01017.47
7.2.150.0320.01119.12
7.2.140.0320.00719.14
7.2.130.0280.01418.88
7.2.120.0320.00419.07
7.2.110.0320.00419.10
7.2.100.0210.00718.98
7.2.90.0280.00418.97
7.2.80.0240.00419.25
7.2.70.0190.00918.94
7.2.60.0250.00319.16
7.2.50.0250.00419.23
7.2.40.0270.00718.95
7.2.30.0240.00618.87
7.2.20.0340.00019.27
7.2.10.0230.00719.42
7.2.00.0040.01619.24
7.1.330.0140.01018.18
7.1.320.0280.00817.98
7.1.310.0280.00317.78
7.1.300.0230.01018.11
7.1.290.0250.00617.96
7.1.280.0270.00817.86
7.1.270.0240.00419.21
7.1.260.0190.01017.91
7.1.250.0330.00017.86
7.1.240.0210.00917.82
7.1.230.0140.01118.16
7.1.220.0180.00717.96
7.1.210.0190.00617.93
7.1.200.0250.00018.04
7.1.190.0210.00417.86
7.1.180.0240.00318.11
7.1.170.0270.00717.56
7.1.160.0220.00518.86
7.1.150.0250.00917.94
7.1.140.0260.00317.77
7.1.130.0260.00017.91
7.1.120.0200.00417.94
7.1.110.0190.00418.15
7.1.100.0210.00417.93
7.1.90.0300.00017.70
7.1.80.0250.00417.94
7.1.70.0260.00018.01
7.1.60.0150.00917.97
7.1.50.0310.00018.84
7.1.40.0290.00617.86
7.1.30.0260.00617.80
7.1.20.0280.00318.06
7.1.10.0300.00317.89
7.1.00.0090.00918.07
7.0.330.0230.00417.59
7.0.320.0190.00817.91
7.0.310.0280.00017.45
7.0.300.0190.00717.59
7.0.290.0190.00517.57
7.0.280.0250.00617.53
7.0.270.0280.00717.66
7.0.260.0310.00317.82
7.0.250.0290.00317.99
7.0.240.0240.01017.65
7.0.230.0290.00617.95
7.0.220.0250.00917.66
7.0.210.0340.00017.63
7.0.200.0340.00317.68
7.0.190.0240.01217.80
7.0.180.0250.00617.55
7.0.170.0270.00317.82
7.0.160.0190.00817.59
7.0.150.0360.00017.40
7.0.140.0240.00817.69
7.0.130.0200.01017.59
7.0.120.0110.01517.86
7.0.110.0150.00719.18
7.0.100.0130.01017.66
7.0.90.0180.00417.77
7.0.80.0170.00317.52
7.0.70.0140.01417.68
7.0.60.0100.00617.45
7.0.50.0170.00617.62
7.0.40.0230.00817.73
7.0.30.0060.00617.79
7.0.20.0150.00917.61
7.0.10.0220.00317.66
7.0.00.0110.01117.72
5.6.400.0200.00316.71
5.6.390.0200.00316.61
5.6.380.0230.01116.67
5.6.370.0180.01516.50
5.6.360.0210.00416.37
5.6.350.0260.00716.44
5.6.340.0270.00316.19
5.6.330.0150.00916.44
5.6.320.0250.00416.50
5.6.310.0280.00616.64
5.6.300.0280.00616.42
5.6.290.0320.00616.57
5.6.280.0300.00416.45
5.6.270.0190.00816.62
5.6.260.0180.01216.73
5.6.250.0220.00416.56
5.6.240.0250.00016.40
5.6.230.0270.00716.66
5.6.220.0250.00916.66
5.6.210.0140.01816.48
5.6.200.0220.00616.66
5.6.190.0150.01116.40
5.6.180.0270.00316.68
5.6.170.0190.00616.62
5.6.160.0200.00316.60
5.6.150.0200.00716.75
5.6.140.0260.00416.38
5.6.130.0220.00316.70
5.6.120.0210.00316.40
5.6.110.0200.01216.53
5.6.100.0260.01016.49
5.6.90.0160.00816.76
5.6.80.0160.00816.63
5.6.70.0140.00916.54
5.6.60.0250.01116.52
5.6.50.0240.00916.63
5.6.40.0200.00716.48
5.6.30.0220.00616.48
5.6.20.0240.00616.62
5.6.10.0230.00716.39
5.6.00.0220.00616.65
5.5.380.0250.00316.48
5.5.370.0220.00416.78
5.5.360.0180.00716.49
5.5.350.0220.00316.49
5.5.340.0230.00416.52
5.5.330.0240.00416.52
5.5.320.0200.01016.43
5.5.310.0140.01416.40
5.5.300.0300.00016.12
5.5.290.0250.00016.50
5.5.280.0260.00316.36
5.5.270.0210.00416.29
5.5.260.0200.00616.49
5.5.250.0230.00316.55
5.5.240.0180.00616.61
5.5.230.0200.00616.52
5.5.220.0200.00416.70
5.5.210.0240.00016.53
5.5.200.0170.00716.24
5.5.190.0150.00916.51
5.5.180.0210.00316.27
5.5.170.0240.00016.64
5.5.160.0250.00416.41
5.5.150.0170.00716.48
5.5.140.0270.00016.23
5.5.130.0250.00716.15
5.5.120.0190.00716.29
5.5.110.0270.00716.37
5.5.100.0310.00016.37
5.5.90.0150.00916.61
5.5.80.0240.00016.46
5.5.70.0210.00316.55
5.5.60.0210.00316.61
5.5.50.0200.00316.59
5.5.40.0160.00816.60
5.5.30.0180.00616.48
5.5.20.0150.00916.48
5.5.10.0160.00816.46
5.5.00.0170.00716.49
5.4.450.0140.00616.07
5.4.440.0180.00316.07
5.4.430.0160.00416.07
5.4.420.0100.01016.07
5.4.410.0150.00616.07
5.4.400.0160.00416.07
5.4.390.0150.00416.07
5.4.380.0180.00316.07
5.4.370.0190.00016.07
5.4.360.0130.00716.07
5.4.350.0170.00316.07
5.4.340.0170.00316.07
5.4.330.0200.00016.07
5.4.320.0160.00316.07
5.4.310.0210.00016.07
5.4.300.0180.00316.07
5.4.290.0160.00316.07
5.4.280.0190.00616.07
5.4.270.0230.00716.07
5.4.260.0250.00316.07
5.4.250.0140.01116.07
5.4.240.0210.00416.07
5.4.230.0190.00416.07
5.4.220.0180.00316.07
5.4.210.0190.00016.07
5.4.200.0210.00016.07
5.4.190.0220.00616.07
5.4.180.0140.00716.07
5.4.170.0250.00016.07
5.4.160.0200.00316.07
5.4.150.0230.00016.07
5.4.140.0220.00416.07
5.4.130.0150.00416.07
5.4.120.0170.00716.07
5.4.110.0150.00616.07
5.4.100.0160.00416.07
5.4.90.0150.00616.07
5.4.80.0180.00016.07
5.4.70.0160.00316.07
5.4.60.0090.00616.07
5.4.50.0250.00016.07
5.4.40.0000.01016.07
5.4.30.0140.00316.07
5.4.20.0070.00716.07
5.4.10.0120.00816.07
5.4.00.0060.00616.07
5.3.290.0110.00716.07
5.3.280.0030.00716.07
5.3.270.0140.00316.07
5.3.260.0030.01016.07
5.3.250.0110.00316.07
5.3.240.0080.00616.07
5.3.230.0070.00716.07
5.3.220.0030.01016.07
5.3.210.0250.00016.07
5.3.200.0090.00616.07
5.3.190.0240.00316.07
5.3.180.0090.00616.07
5.3.170.0000.01316.07
5.3.160.0180.00416.07
5.3.150.0070.00716.07
5.3.140.0150.00016.07
5.3.130.0060.00316.07
5.3.120.0030.00616.07
5.3.110.0180.00416.07
5.3.100.0110.00516.07
5.3.90.0070.01016.07
5.3.80.0090.00616.07
5.3.70.0040.00816.07
5.3.60.0000.01016.07
5.3.50.0100.00016.07
5.3.40.0060.00316.07
5.3.30.0030.00616.07
5.3.20.0070.00316.07
5.3.10.0030.00616.07
5.3.00.0060.00316.07
5.2.170.0090.00016.07
5.2.160.0090.00616.07
5.2.150.0000.00916.07
5.2.140.0080.00316.07
5.2.130.0050.00516.07
5.2.120.0050.00516.07
5.2.110.0090.00016.07
5.2.100.0060.00316.07
5.2.90.0040.00416.07
5.2.80.0070.00716.07
5.2.70.0060.00316.07
5.2.60.0140.00016.07
5.2.50.0090.00016.07
5.2.40.0060.00616.07
5.2.30.0150.00016.07
5.2.20.0090.00616.07
5.2.10.0080.00816.07
5.2.00.0110.00316.07
5.1.60.0130.00016.07
5.1.50.0100.00316.07
5.1.40.0070.00716.07
5.1.30.0170.00016.07
5.1.20.0110.00316.07
5.1.10.0150.00416.07
5.1.00.0160.00316.07
5.0.50.0110.00016.07
5.0.40.0140.00416.07
5.0.30.0000.01216.07
5.0.20.0160.00016.07
5.0.10.0060.00616.07
5.0.00.0160.00016.07
4.4.90.0060.00016.07
4.4.80.0000.00716.07
4.4.70.0050.00516.07
4.4.60.0060.00016.07
4.4.50.0060.00016.07
4.4.40.0100.00016.07
4.4.30.0090.00016.07
4.4.20.0100.00016.07
4.4.10.0070.00216.07
4.4.00.0090.00016.07
4.3.110.0100.00016.07
4.3.100.0050.00516.07
4.3.90.0090.00016.07
4.3.80.0030.00616.07
4.3.70.0070.00016.07
4.3.60.0060.00016.07
4.3.50.0090.00016.07
4.3.40.0100.00016.07
4.3.30.0070.00016.07
4.3.20.0060.00016.07
4.3.10.0000.00716.07
4.3.00.0070.00016.07

preferences:
95.31 ms | 403 KiB | 5 Q