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run code in 300+ PHP versions simultaneously
<?php for ($i = 0; $i < 100000; $i++) { $GLOBALS["a$i"] = rand(0, 1000000); } $start = microtime(true); for ($runs = 1000; $runs > 0; $runs--) { array_key_exists('a1111111', $GLOBALS); } $end = microtime(true); printf("[GLOBALS]array_key_exists() took %.5f seconds\n", $end - $start);

preferences:
33.13 ms | 402 KiB | 5 Q