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<?php $arr = range(0, 262); $start = microtime(true); for ($i = 0; $i < 1000000; $i++) { in_array(42, $arr); } $time_1 = microtime(true) - $start; $arr = []; for ($i = 0; $i < 263; $i++) { $arr[$i] = ''; } $start = microtime(true); for ($i = 0; $i < 1000000; $i++) { isset($arr[42]); } $time_2 = microtime(true) - $start; echo "in_array : $time_1\r\n"; echo "isset : $time_2\r\n";