How to call a function or method inside its own class in php? [duplicate]

Question

I declare my class in PHP and several functions inside. I need to call one of this functions inside another function but I got the error that this function is undefined. This is what I have:

<?php
class A{

 function b($msg){
   return $msg;
 }

 function c(){
   $m = b('Mesage');
   echo $m;
 }
}

Answer 1

This is basic OOP. You use the $this keyword to refer to any properties and methods of the class:

<?php
class A{

 function b($msg){
   return $msg;
 }

 function c(){
   $m = $this->b('Mesage');
   echo $m;
 }
}

I would recommend cleaning up this code and setting the visibility of your methods (e.e. private, protected, and public)

<?php
class A{

 protected function b($msg){
   return $msg;
 }

 public function c(){
   $m = $this->b('Mesage');
   echo $m;
 }
}

Answer 2

You can use class functions using $this

<?php
    class A{

     function b($msg){
       return $msg;
     }

     function c(){
       $m = $this->b('Mesage');
       echo $m;
     }
    }