Master the correct way to reference configuration files

1. The use of global

As we all know, global variables cannot be used without modification in methods, as follows:

<?php
   $a=1;
   function Test()
   {
       echo $a;//报错，undefined variable
   }
?>

So We need help from global:

<?php
   $a=1;
   function Test()
   {
       global $a;
       echo $a;//报错，undefined variable
   }
   Test();//输出1

?>

2. Introduce the configuration file

The configuration file is as follows:

<?php       //在根目录下config\config.php
return array(
    //数据库配置
    &#39;database&#39;=>array(
         &#39;type&#39;=>&#39;mysql&#39;,
         &#39;host&#39;=>&#39;localhost&#39;,
         &#39;port&#39;=>&#39;3306&#39;,
         &#39;user&#39;=>&#39;root&#39;,
         &#39;pass&#39;=>&#39;root&#39;,
         &#39;charset&#39;=>&#39;utf8&#39;,
         &#39;dbname&#39;=>&#39;my_database&#39;,
         &#39;prefix&#39;=>&#39;&#39;

    ),
    &#39;system&#39;=>array(
        &#39;error_reporting&#39;=>E_ALL,//错误级别控制，默认显示所有错误
        &#39;display_errors&#39;=>1,     //错误显示控制，1代表显示错误，0代表隐藏错误；
    )
);

?>

is used as follows:

<?php  //在根目录下
function abc(){          
    global $config;
    $config=include &#39;./config/config.php&#39;;
}
function efg(){
    global $config;
    var_dump($config);
}
abc();//调用abc()方法，将配置文件赋值引入
efg();//输出配置文件
echo "<br>";
echo "<pre class="brush:php;toolbar:false">";
var_dump($config);
?>

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