global variable can't accessible inside the function

Question

I need to access the global variable from another function. First I have assigned the value to global variable in one function. When I am trying to get that value from another function, it always returns null. Here my code is

StockList.php

<?php 
 $_current;
class StockList
{
  public function report(){
    global $_current;
    $_current = 10;
  }

  public function getValue(){
     print_r($GLOBALS['_current']);
  }
}
?>

Suggestion.php

<?php

   include ("StockList.php");
   $stk = new StockList();  

   $stk->getValue();

?>

Thanks in advance.

Why does this need to be a global variable? Why can't you simply use a class property? — Mark Baker, Feb 15 '17 at 13:15
You can't access a global variable prior to it's creation. With that said, try to avoid globals. — Andrei, Feb 15 '17 at 13:15
Please check this : http://stackoverflow.com/questions/4768187/how-to-pass-global-variables-to-classes-in-php — Ganesh Radhakrishnan, Feb 15 '17 at 13:17
You never call `report()` in your example. So it's not setting the variable. If you call it it works as expected https://3v4l.org/A0HCY — Machavity, Feb 15 '17 at 13:19
Actually the report() is called in the index.php. The getValue() function is called in Ajax. I am not append the original code. — balaraman, Feb 15 '17 at 13:24
I have modified my answer, thats the best i can suggest on given peek of your code. — Abhay Maurya, Feb 15 '17 at 13:35

Abhay Maurya · Answer 1 · 2017-02-15T13:36:26.793

0

Man, its hard to understand what are you trying to do as you said you have called report() in your index.php Anyways, when dealing with classes, to set variable values, standard procedure is as following:

class StockList
{
  public $_current;
  public function setValue($value){
    $this->current = $value;
  }

  public function getValue(){
     return $this->current;
  }
}

And after whenever you wanna use the class:

<?php
   include ("StockList.php");
   $stk = new StockList();  
   $stk->setValue(10);
   $_current = $stk->getValue();
   var_dump($_current);
?>

This is basic idea of OOP, benefits of this approach are:

You can dynamically set value of $_current.
Your getValue() function is not dedicated for printing the value of the variable, thats why you can use that function only for getting the value and then do whatever you want with it.

edited Feb 15 '17 at 13:36

answered Feb 15 '17 at 13:18

Abhay Maurya

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The report() is called in the index.php. The getValue() function is called in Ajax. – balaraman Feb 15 '17 at 13:21
can you somehow show the code for report() calling? OR make sure that you have called report() after making class instance and before calling getValue(); – Abhay Maurya Feb 15 '17 at 13:22
@balaraman It sounds like you're expecting the value change to be retained across pages. You should use a session for that if that's the case. Otherwise you have to set the value every time – Machavity Feb 15 '17 at 13:24

global variable can't accessible inside the function

1 Answers1