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run code in 300+ PHP versions simultaneously
<?php class a { static $b = array('23' , '45'); static $c = array('67'); //static $d = array_merge(self::$b , self::$c); } $x = array_merge(a::$b , a::$c); print_r($x);

preferences:
35.16 ms | 402 KiB | 5 Q