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PHP函数getenv使用实例介绍

Jun 13, 2016 am 09:35 AM

分享下PHP函数getenv使用实例,getenv函数主要用来获取一个环境变量的值,常见的PHP探针程序都是使用的getenv函数。

getenv(PHP 4, PHP 5)
// getenv — 获取一个环境变量的值
函数说明:www.jbxue.com
string getenv ( string $varname )

// 获取一个环境变量的值。
// 使用 phpinfo() 你可以看到所有环境变量的列表。
参数说明:
$varname 变量名。
函数返回值:
// 返回环境变量 varname 的值, 如果环境变量 varname 不存在则返回 FALSE。
函数应用实例:

<?<span>php
</span><span>//</span><span> getenv() 使用示例</span>
<span>$ip</span> = <span>getenv</span>('REMOTE_ADDR'<span>);
</span><span>//</span><span> 或简单仅使用全局变量($_SERVER 或 $_ENV)</span>
<span>$ip</span> = <span>$_SERVER</span>['REMOTE_ADDR'<span>];
</span>?>
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通过phpinfo可以看到整个PHP环境的配置信息,那么想要获取其中一个变量信息要咋办呢?

获取如下信息:

php代码:

<span>echo</span> <span>getenv</span>('userprofile');<span>//</span><span> C:\Windows\system32\config\systemprofile</span>
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