Home php教程 php手册 如何获知PHP程序占用多少内存(memory_get_usage)

如何获知PHP程序占用多少内存(memory_get_usage)

Jun 13, 2016 am 11:58 AM
get memory p php usage under code use Memory occupy copy How many how yes Example program

下面是使用示例:

复制代码 代码如下:


echo memory_get_usage(), '
'; // 313864
$tmp = str_repeat('http://www.nowamagic.net/', 4000);
echo memory_get_usage(), '
'; // 406048
unset($tmp);
echo memory_get_usage(); // 313952
?>


上面的程序后面的注释代表了它们的输出(单位为 byte(s)),也就是当时 PHP 脚本使用的内存(不含 memory_get_usage() 函数本身占用的内存)。

由上面的例子可以看出,要想减少内存的占用,可以使用 PHP unset() 函数把不再需要使用的变量删除。类似的还有:PHP mysql_free_result() 函数,可以清空不再需要的查询数据库得到的结果集,这样也能得到更多可用内存。

PHP memory_get_usage() 函数还可以有个参数,$real_usage,其值为布尔值。默认为 FALSE,表示得到的内存使用量不包括该函数(PHP 内存管理器)占用的内存;当设置为 TRUE 时,得到的内存为不包括该函数(PHP 内存管理器)占用的内存。

所以在实际编程中,可以用 memory_get_usage() 函数比较各个方法占用内存的高低,来选择使用哪种占用内存小的方法。

贴个使用函数:

复制代码 代码如下:


if (!function_exists('memory_get_usage'))
{
/**
+----------------------------------------------------------
* 取得内存使用情况
+----------------------------------------------------------
* @return integer
+----------------------------------------------------------
*/
function memory_get_usage()
{
$pid = getmypid();
if (IS_WIN)
{
exec('tasklist /FI "PID eq ' . $pid . '" /FO LIST', $output);
return preg_replace('/[^0-9]/', '', $output[5]) * 1024;
}
else
{
exec("ps -eo%mem,rss,pid | grep $pid", $output);
$output = explode(" ", $output[0]);
return $output[1] * 1024;
}
}
}


再来个函数使用例子:

复制代码 代码如下:


//memory_get_usage();
$m1 = memory_get_usage();
echo '
m1:',$m1;//58096
$a = 'hello';
$b = str_repeat($a,1000);
$m2 = memory_get_usage();
echo '
m2:',$m2;//63424
unset($b);
$m3 = memory_get_usage();
echo '
m3:',$m3;//58456
?>

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

Sources say Samsung Electronics and SK Hynix will commercialize stacked mobile memory after 2026 Sources say Samsung Electronics and SK Hynix will commercialize stacked mobile memory after 2026 Sep 03, 2024 pm 02:15 PM

According to news from this website on September 3, Korean media etnews reported yesterday (local time) that Samsung Electronics and SK Hynix’s “HBM-like” stacked structure mobile memory products will be commercialized after 2026. Sources said that the two Korean memory giants regard stacked mobile memory as an important source of future revenue and plan to expand "HBM-like memory" to smartphones, tablets and laptops to provide power for end-side AI. According to previous reports on this site, Samsung Electronics’ product is called LPWide I/O memory, and SK Hynix calls this technology VFO. The two companies have used roughly the same technical route, which is to combine fan-out packaging and vertical channels. Samsung Electronics’ LPWide I/O memory has a bit width of 512

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

See all articles