检查PHP数组占用的内存量

Question

有没有简单的方法来检查某个数组占用多少内存？

就像我有一些10k行数组，需要知道服务器在一些$arr内记住它需要多少MB / KB

Answer 1

您可以查看以下功能：http://php.net/manual/en/function.memory-get-usage.php

Answer 2

// 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;