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<?php $start = microtime(true); for ($i = 0; $i < 10000000; $i++) { 2 ** 16; } echo "Pow operator: " . (microtime(true) - $start) . "\n"; $start = microtime(true); for ($i = 0; $i < 10000000; $i++) { pow(2, 16); } echo "Pow function: " . (microtime(true) - $start) . "\n";

preferences:
33.16 ms | 402 KiB | 5 Q