从 PHP 函数内部更改全局变量 [英] Changing a global variable from inside a function PHP

问题描述

我正在尝试从函数内部更改函数外部的变量.因为如果函数检查的日期超过一定数量，我需要它更改代码开头日期的年份.

I am trying to change a variable that is outside of a function, from within a function. Because if the date that the function is checking is over a certain amount I need it to change the year for the date in the beginning of the code.

$var = "01-01-10";
function checkdate(){
     if("Condition"){
            $var = "01-01-11";
      }
}

推荐答案

A.使用 global 关键字从应用范围导入.

A. Use the global keyword to import from the application scope.

$var = "01-01-10";
function checkdate(){
    global $var;  
    if("Condition"){
        $var = "01-01-11";
    }
}
checkdate();

B.使用 $GLOBALS 数组.

$var = "01-01-10";
function checkdate(){
    if("Condition"){
        $GLOBALS['var'] = "01-01-11";
    }
}
checkdate();

C.传递变量通过引用.

$var = "01-01-10";
function checkdate(&$funcVar){  
    if("Condition"){
        $funcVar = "01-01-11";
    }
}
checkdate($var);

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