3v4l.org

run code in 300+ PHP versions simultaneously
<?php <?php $starttime = microtime(true); $sArr = array(); for ($i = 0; $i < 300000; $i++) { $sArr[] = 'String concatenation. ' . $i; } $str = implode('', $sArr); $x = md5($str); $endtime = microtime(true); print "array append & implode: " . ($endtime - $starttime) . " s\n" ; // standard string append $starttime = microtime(true); $str = ''; for ($i = 0; $i < 300000; $i++) { $str .= 'String concatenation. ' . $i; } $x = md5($str); unset($str); $endtime = microtime(true); print "string concat: " . ($endtime - $starttime) . " s\n" ; $starttime = microtime(true); $sArr = array(); for ($i = 0; $i < 300000; $i++) { $sArr[] = 'String concatenation. ' . $i; } $str = implode('', $sArr); $x = md5($str); $endtime = microtime(true); print "array append & implode: " . ($endtime - $starttime) . " s\n" ;

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)
5.4.160.0160.05114.59
5.4.150.0150.04712.36
5.4.140.0130.05812.05
5.4.130.0370.09512.03
5.4.120.0260.08212.00
5.4.110.0240.04611.99
5.4.100.0130.04411.99
5.4.90.0220.05811.99
5.4.80.0320.04111.99
5.4.70.0130.04411.99
5.4.60.0110.04811.99
5.4.50.0220.06911.99
5.4.40.0170.04911.98
5.4.30.0170.05111.97
5.4.20.0120.04311.97
5.4.10.0210.06711.97
5.4.00.0120.04911.46
5.3.260.0150.04713.33
5.3.250.0170.04313.30
5.3.240.0210.06912.72
5.3.230.0170.04912.71
5.3.220.0140.05312.68
5.3.210.0190.05412.68
5.3.200.0200.06112.68
5.3.190.0120.04812.68
5.3.180.0140.04712.67
5.3.170.0150.06412.67
5.3.160.0220.05912.67
5.3.150.0180.06312.67
5.3.140.0240.05712.66
5.3.130.0170.07612.66
5.3.120.0120.04912.66
5.3.110.0220.05912.66
5.3.100.0210.07812.12
5.3.90.0210.07912.08
5.3.80.0180.06112.08
5.3.70.0150.04512.08
5.3.60.0230.07812.06
5.3.50.0280.07812.00
5.3.40.0240.09812.00
5.3.30.0150.04611.94
5.3.20.0130.05411.72
5.3.10.0170.06011.68
5.3.00.0120.04311.67

preferences:
134.76 ms | 1399 KiB | 7 Q