How to loop through an object’s properties

The syntax

      foreach($objectName as [ $propertyName => ] $propertyValue) {
        // statements to execute 
      }

Define an Employee class

      class Employee {
        public $firstName, $lastName; 
        private $ssn, $dob;
        public function __construct($first, $last) { 
          $this->firstName = $first; 
          $this->lastName = $last; 
        } 
        
        // getSSN, setSSN, getDOB, setDOB methods not shown 
        
        // Show all properties – private, protected, and public public 
        function showAll() { 
          echo("<ul>\n");
          foreach($this as $name => $value ) {
            echo("<li>$name = $value</li>\n");
          }
          echo("</ul>\n");
        } 
      }

Create an Employee object with four properties

      $employee = new Employee('John', 'Doe'); 
      $employee->setSSN('999-14-3456'); 
      $employee->setDOB('3-15-1970');

Show all properties

      $employee->showAll();

Show public properties only

      echo("<ul>\n");
      foreach($employee as $name => $value ) { 
        echo("<li>$name = $value</li>\n");
      }
      echo("</ul>\n");

    Description
      You can use a foreach loop to access each property in an object.
A foreach loop coded inside a method of an object loops through the object’s private, protected, and public properties.
A foreach loop coded outside an object only loops through the object’s public properties.

    

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