class_example.php

<?php

class My_Class {
  
  // some variable I want to use later
  protected $var_a = '';
  
  // another variable I want to use later
  protected $var_b = '';
  
  public function __construct() {
    
    // assign values to my global variables
    $this->var_a = array( 'apples', 'oranges', 'bananas' );
    $this->var_b = array( 'pizza', 'beer', 'chips' );
    
  }
  
  /**
   * function that will loop through all of our foods
   * 
   * @param bool $healthy   true for healthy foods, false for unhealthy foods
   */
  public function my_loop( $healthy = true ) {
   
    if ( $healthy ) {
      $food = $this->var_a; // if we're showing healthy food
    } else {
      $food = $this->var_b;
    }
  
    foreach( $food as $nom ) {
      $noms[] = $nom;
    }
    
    return $noms;
  }

  // this function will take the output of my_loop and echo it
  public function echo_my_loop() {
    $foods = $this->my_loop( false );
    
    echo sprintf( 'I eat %s, %s and %s all day.', $foods[0], $foods[1], $foods[2] );
    // will output "I eat pizza, beer and chips all day."
  }
  
}

$My_Class = new My_Class;