PHP call to an indefinite function

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I am trying to call a function from another function. I get an error:

Fatal error: Call to undefined function getInitialInformation()
in controller.php on line 24

controller.php file:

require_once("model/model.php"); 

function intake() {
    $info = getInitialInformation($id); //line 24
}

model/model.php

function getInitialInformation($id) {
    return $GLOBALS['em']->find('InitialInformation', $id);
}

Things already tried:

  1. Verified that the require_once works, and the file exists in the specified location.
  2. Verified that the function exists in the file.

I am not able to figure this out. Am I missing something here?


How to reproduce the error, and how to fix it:

  1. Put this code in a file called p.php:

    <?php
    class yoyo{
        function salt(){
        }
        function pepper(){
            salt();
        }
    }
    $y = new yoyo();
    $y->pepper();
    ?>
    
    
  2. Run it like this:

    php p.php
    
    
  3. We get error:

    PHP Fatal error:  Call to undefined function salt() in
    /home/el/foo/p.php on line 6
    
    
  4. Solution: use $this->salt(); instead of salt();

    So do it like this instead:

    <?php
    class yoyo{
        function salt(){
        }
        function pepper(){
            $this->salt();
        }
    }
    $y = new yoyo();
    $y->pepper();
    
    ?>
    
    

If someone could post a link to why $this has to be used before PHP functions within classes, yeah, that would be great.