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run code in 300+ PHP versions simultaneously
<?php function simple ( & $var) { $var = 2; } $lambda = function( & $var) { $var = 2; }; $var1 = 1; simple($var1); var_dump($var1); $var2 = 1; $lambda($var2); var_dump($var2);

preferences:
34.98 ms | 402 KiB | 5 Q