查看php脚本当前的内存消耗情况

memory_get_usage()返回当前的内存消耗情况，返回已使用内存字节数。

以下是php官方介绍：

(PHP 4 >= 4.3.2, PHP 5)
memory_get_usage — Returns the amount of memory allocated to PHP

Description

int memory_get_usage ([ bool 

$real_usage

 =
false ] )
Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.

Parameters

real_usage

Set this to 

TRUE

 to
get the real size of memory allocated from system. If not set or 

FALSE

 only the
memory used by emalloc() is reported.

Return Values

Returns the memory amount in bytes.

Changelog

Version	Description
5.2.1	Compiling with --enable-memory-limit is no longer required for this function to exist.
5.2.0	real_usage  was added.

Examples

Example #1 A memory_get_usage() example

<?php
// This is only an example, the numbers below will

// differ depending on your system

echo memory_get_usage() . "\n"; // 36640

$a = str_repeat("Hello", 4242);

echo memory_get_usage() . "\n"; // 57960

unset($a);

echo memory_get_usage() . "\n"; // 36744

?>

See Also

memory_get_peak_usage() -
Returns the peak of memory allocated by PHP
memory_limit