3v4l.org

run code in 300+ PHP versions simultaneously
<?php $max = 1000000; $arr = range(1,$max,3); $arr2 = range(1,$max,2); $arr = array_merge($arr,$arr2); $time = -microtime(true); $res1 = array_unique($arr); $time += microtime(true); var_dump("deduped to ".count($res1)." in ".$time); // deduped to 666667 in 32.300781965256 $time = -microtime(true); $res2 = array(); foreach($arr as $key=>$val) { $res2[$val] = true; } $res2 = array_keys($res2); $time += microtime(true); echo "<br />deduped to ".count($res2)." in ".$time;// deduped to 666667 in 0.84372591972351 
Output for 5.4.0 - 5.4.31
Parse error: syntax error, unexpected '$key' (T_VARIABLE) in /in/tNuSO on line 15
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_VARIABLE in /in/tNuSO on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_VARIABLE in /in/tNuSO on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/tNuSO on line 15
Process exited with code 255.
preferences:
189.09 ms | 1395 KiB | 121 Q