3v4l.org

run code in 300+ PHP versions simultaneously
<?php $classmap1 = array(); for ($i=1; $i<=100; $i++) { $classmap1['a'.$i] = $i+1; } $classmap2 = array(); for ($i=1; $i<=100; $i++) { $classmap2['b'.$i] = $i+1; } $startTimeMerge = microtime(true); $map = array_merge($classmap1, $classmap2); $endTimeMerge = microtime(true); $startTimeForeach = microtime(true); foreach ($classmap2 as $k => $v) { $classmap1[$k] = $v; } $endTimeForeach = microtime(true); function amerge(array &$a, array &$b) { foreach (&$b as $key => $value) { $a[$key] = $value; } return $a; } $startTimeFunc = microtime(true); $am = amerge($classmap1, $classmap2); $endTimeFunc = microtime(true); echo "Merging took " . (($endTimeMerge - $startTimeMerge)*1000) ." microseconds<br />\n"; //var_dump($map); echo "Foreach took " . (($endTimeForeach - $startTimeForeach)*1000) ." microseconds<br />\n"; //var_dump($classmap1); echo "Func took " . (($endTimeFunc - $startTimeFunc)*1000) ." microseconds<br />\n"; //var_dump($am);

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)
5.4.240.0110.03912.40
5.4.230.0200.06512.39
5.4.220.0110.03912.39
5.4.210.0100.03912.39
5.4.200.0120.04012.39
5.4.190.0100.04012.39
5.4.180.0070.04312.39
5.4.170.0090.04112.39
5.4.160.0140.03712.39
5.4.150.0120.04712.38
5.4.140.0210.06112.08
5.4.130.0110.04112.06
5.4.120.0100.04112.03
5.4.110.0100.04212.02
5.4.100.0100.03912.02
5.4.90.0100.04312.02
5.4.80.0130.03712.02
5.4.70.0130.04512.02
5.4.60.0110.04412.02
5.4.50.0100.03812.02
5.4.40.0120.03812.00
5.4.30.0100.04212.00
5.4.20.0080.04112.00
5.4.10.0130.03712.00
5.4.00.0120.03711.49
5.3.280.0140.06812.71
5.3.270.0120.04212.72
5.3.260.0140.03912.72
5.3.250.0100.04112.72
5.3.240.0120.04212.72
5.3.230.0130.03912.71
5.3.220.0080.04312.68
5.3.210.0120.04112.68
5.3.200.0120.04112.68
5.3.190.0110.04212.68
5.3.180.0100.04112.67
5.3.170.0120.03812.67
5.3.160.0090.04212.67
5.3.150.0140.05212.67
5.3.140.0090.04212.66
5.3.130.0070.04612.66
5.3.120.0190.04812.66
5.3.110.0150.03812.66
5.3.100.0080.04512.12
5.3.90.0120.04112.09
5.3.80.0070.04212.09
5.3.70.0100.04112.09
5.3.60.0110.03912.07
5.3.50.0130.03812.02
5.3.40.0190.04712.02
5.3.30.0090.03911.97
5.3.20.0130.04111.75
5.3.10.0130.04311.72
5.3.00.0120.04511.71

preferences:
141.15 ms | 1394 KiB | 7 Q