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PHP Static Methods

W3Schools.com

<?php
// define a protected Static Method
class domain {
  protected static function getWebsiteName() {
    return "W3Schools.com";
  }
}

class domainW3 extends domain {
  public $websiteName;
  public function __construct() {
    $this -> websiteName = parent::getWebsiteName();
  }	
}

$domainW3 = new domainW3;
echo $domainW3 -> websiteName;
?>

To call a static method from a child class, use the parent keyword inside the child class. Here, the static method can be public or protected.