PHP如何在函数中定义局部变量？

Question

I have this code:

  require_once('../config.php');
  function ha(){
     global $user; /* THIS I NEED TO DEFINE LOCAL ONLY ACCESS FROM THIS FUNCTION */
     return $user;
}

echo ha();

echo $user; /* GLOBAL VARIABLE VALUE */

So how to define in function local variable that will be accessed throught inside function ha()? So the outout from the echo ha(); will be value $user that is stored in config.php, and last line echo $user needs to be empty on echo...when i define in function static $user i get empty value...so how to define in php static value of variable that is read from config.php and access value only in function?

Answer 1

function ha(){
    global $user;
    $user2 = 'abc'; //no prefix whatsoever

    echo $user; //prints global $user
    echo $user2; //prints local $user2
}

how to define in php static value of variable that is read from config.php and access value only in function?

It's all about variable scope , if you want a variable to be defined in config file and only be readable from within a function, then your current approach is incorrect. Anything declared in main scope (such as config file loaded in main scope) will be accesible from nearly anywhere in the code. If you don't want variables to be accessed otherwise than through ha() then they need to be defined within ha().