檢查PHP數組佔用多少內存

Question

有沒有簡單的方法來檢查某個數組佔用多少內存？

就像我已經得到了一些10K行陣列，並且需要知道多少MB/KB需要服務器記住它裏面的一些$arr

Answer 1

// how much memory are you using before building your array 
$baseMemory = memory_get_usage(false); 
// create your array 
$a = array('A',1,'B',2); 
// how much memory are you using now the array is built 
$finalMemory = memory_get_usage(false); 
// the difference is a pretty close approximation 
$arrayMemory = $finalMemory - $baseMemory; 

Answer 2

你可以看看下面的功能：http://php.net/manual/en/function.memory-get-usage.php