Scope defines where a variable can be used.
  
  ## Local scope
  
  ```php
  function test() {
    $x = 10;
    echo $x;
  }
  ```
  
  ## Global scope
  
  ```php
  $x = 5;
  
  function show() {
    global $x;
    echo $x;
  }
  ```
  
  ## Static variables
  
  ```php
  function counter() {
    static $count = 0;
    $count++;
    echo $count;
  }
  
  counter(); // 1
  counter(); // 2
  ```
  
  > Next: Superglobals like $_GET and $_POST.

Understand local, global, and static scope in PHP functions.

Variable Scope in PHP

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Variable Scope in PHP

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