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<?php const PERMANENT = -1; function mergeMaxAges() { $max_ages = func_get_args(); // Filter out all max-age values set to cache permanently. $max_ages = array_filter($max_ages, function ($max_age) { return $max_age !== PERMANENT; }); // If nothing is left, then all max-age values were set to cache // permanently, and then that is the result. if (empty($max_ages)) { return PERMANENT; } return min($max_ages); } for ($i = 0; $i < 10000; $i++) { mergeMaxAges(0, 60); mergeMaxAges(0, 0); mergeMaxAges(0, PERMANENT); mergeMaxAges(PERMANENT, 60); mergeMaxAges(PERMANENT, PERMANENT); }
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