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
'database'=>array(
'type'=>'mysql',
'host'=>'localhost',
'port'=>'3306',
'user'=>'root',
'pass'=>'root',
'charset'=>'utf8',
'dbname'=>'my_database',
'prefix'=>''
),
'system'=>array(
'error_reporting'=>E_ALL,//错误级别控制，默认显示所有错误
'display_errors'=>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 './config/config.php';
}
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);
?>Recommended: php tutorial,php video tutorial
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