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<?php function doSmth(int $mem): void { $array = range(0, 99); echo 'memory in function: ' . memory_get_usage() - $mem . PHP_EOL; } // Сначала выводим значение memory_get_usage() echo 'memory before use: ' . memory_get_usage() . PHP_EOL; $mem = memory_get_usage(); echo 'init $mem' . PHP_EOL; doSmth($mem); echo 'memory after use: ' . memory_get_usage() - $mem . PHP_EOL;