php中get_cfg_var()和ini_get()的用法及区别
这篇文章主要介绍了php中get_cfg_var()和ini_get()的用法及区别,实例分析了get_cfg_var()和ini_get()函数的区别与使用技巧,需要的朋友可以参考下
本文实例讲述了php中get_cfg_var()和ini_get()的用法及区别。分享给大家供大家参考。具体分析如下:
php里get_cfg_var()和ini_get()都是取得配置值的函数,当你需要获取php.ini里的某个选项的配置值时,这两个函数都都可以使用,得到的结果是一样的。
不过,get_cfg_var()和ini_get()也有一些区别,这便是本文要谈的内容。
在说这两个函数区别之前,我们先来了解一下它们的含义及用法。
有关ini_get()的用法,前面有一篇《php用ini_get获取php.ini里变量值的方法》,这里不再累赘。
下面主要说说get_cfg_var()函数。
get_cfg_var: 取得PHP的配置选项值。
语法: string get_cfg_var(string varname);
返回值: 字符串
内容说明: 若正确取得目前 PHP 配置选项 varname,则返回变量值。失败则返回 false。
下面说说这两个函数的区别
其实,这两个函数的区别是很鲜明,,并且易懂易学易用。
get_cfg_var(): 取的值是配置文件中的值
ini_get(): 则取的当前值
比如
ini_set('SMTP', '192.160.0.24'); // 改变 SMTP 的当前值 print get_cfg_var('SMTP'); // 返回 localhost print ini_get('SMTP'); // 返回 192.160.0.24
代码
输出:
display_errors = 1 register_globals = 0//在我机器上什么也没有 post_max_size = 8M post_max_size+1 = 9 allow_url_fopen = 1
代码
输出
display_errors = 1 register_globals = post_max_size = 8M post_max_size+1 = 9 allow_url_fopen = 1
另外,这里提一提ini_get_all()函数,这个函数与ini_get()不同,ini_get_all()函数是以数组的形式返回整个php的环境变量,不过它的用法也很简单。
ini_get_all()会把所有选项值以数组的形式返回,方便你当phpinfo()无法使用的时候来使用。
例子:
输出:
Array ( [allow_call_time_pass_reference] => Array ( [global_value] => 1 [local_value] => 1 [access] => 6 ) [allow_url_fopen] => Array ( [global_value] => 1 [local_value] => 1 [access] => 7 ) … )
希望本文所述对大家的php程序设计有所帮助。

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