Global variable not working in php

Question

I am facing some errors with use of global variables. I defined a $var in global scope and trying to use it in functions but it not accessible there. Please see below code for better explanation:

File a.php:

<?php

  $tmp = "testing";

  function testFunction(){
     global $tmp;
     echo($tmp);
  }

So a bit about how this function is called.

File b.php:

<?php
  include 'a.php'
  class testClass{
    public function testFunctionCall(){
        testFunction();
    }
  }

The above 'b.php' is called using:

$method = new ReflectionMethod($this, $method);
$method->invoke();

Now the desired output is 'testing' but the output received is NULL.

Thanks in advance for any help.

Answer 1

You missed calling your function and also remove the protected keyword.

Try this way

<?php

  $tmp = "testing";

  testFunction(); // you missed this

  function testFunction(){  //removed protected
     global $tmp;
     echo($tmp);
  }

Same code but using $GLOBALS, gets you the same output.

<?php

$tmp = "testing";

testFunction(); // you missed this

function testFunction(){  //removed protected
    echo $GLOBALS['tmp'];
}

Answer 2

This protected function can't access the variable. So use by removing protected.

<?php

  $tmp = "testing";

   function testFunction(){
     global $tmp;
     echo ($tmp);
  }

Answer 3

protected functions need to be in a class like this:

 Class SomeClass extends SomeotherClass {

   public static $tmp = "testing";

   protected function testFunction() {

      echo self::$tmp;

   }
}

Answer 4

I was having the same problem here. As $GLOBALS is seen within any function I used this :

<?php

  $GLOBALS['tmp'] = "testing";

  function testFunction(){

     echo( $GLOBALS['tmp'] );
  }