PHP reads external variable $GLOBALS

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Reading external variables $GLOBALS

$one = 1;function demo(){
    $two = 2;    // 如果直接 $one 会在代码中报错
    // 读取自定义函数demo外部的变量one - $GLOBALS['one']
    $result = $two + $GLOBALS['one'];    
    return $result;
}echo demo(); // 3

Create an external variable

function demo2(){
    // 创建一个外部变量
    $GLOBALS['aaa'] = 'aaaaaaaa';    
    echo &#39;demo2&#39; . &#39;<br/>&#39;;
}// 这样用会报错, 需要先调用demo2函数才行
//echo $aaa;demo2();
 // demo2echo $aaa . &#39;<br/>&#39;; 
 // aaaaaaaa

Call multiple external variables

$one = 1;$two = 2;$five = 5;function demo(){
    // 调用多个外部变量
    global $one, $two, $five;    
    return $one + $two + $five;
}echo demo() . &#39;<br/>&#39;; // 8

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