How to find the source code of func_get_args()?

/**

<code> *计算任意多个数的和，并返回计算后的结果
 */
function sum(){  //这里的括号中没有定义任何参数
    $total = 0;
    //使用func_get_args()来获取当前函数的所有实际传递参数，返回值为array类型
    $varArray = func_get_args();
    foreach ($varArray as $var){
        $total += $var;
    }
    return $total;
}

/*****下面是调用示例*****/
echo sum(1, 3, 5);  //计算1+3+5
echo sum(1, 2); //计算1+2
echo sum(1, 2, 3, 4);   //计算1+2+3+4
</code>

func_get_args() to get all the actual passed parameters of the current function, the return value is array type
How can I find the source code of func_get_args()? I'd like to see how to implement this behavior.

Reply content:

/**

<code> *计算任意多个数的和，并返回计算后的结果
 */
function sum(){  //这里的括号中没有定义任何参数
    $total = 0;
    //使用func_get_args()来获取当前函数的所有实际传递参数，返回值为array类型
    $varArray = func_get_args();
    foreach ($varArray as $var){
        $total += $var;
    }
    return $total;
}

/*****下面是调用示例*****/
echo sum(1, 3, 5);  //计算1+3+5
echo sum(1, 2); //计算1+2
echo sum(1, 2, 3, 4);   //计算1+2+3+4
</code>

func_get_args() to get all the actual passed parameters of the current function, the return value is array type
How can I find the source code of func_get_args()? I'd like to see how to implement this behavior.

The built-in function source code is available at https://github.com/php/php-sr...