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<?php class Ancestor { public $publicVar = "ancestor's public var\n"; static $staticVar = "ancestor's static var\n"; function publicMethod(){ echo "this is ancestor's public method\n"; // is $this is set up if(isset($this)){ echo "publicMethod is in object context\n"; }else{ echo "publicMethod is in static context\n"; } } static function staticMethod(){ echo "this is ancestor's static method\n"; // is $this is set up if(isset($this)){ echo "staticMethod is in object context\n"; }else{ echo "staticMethod is in static context\n"; } } } class Descendant extends Ancestor { public $publicVar = "descendant's public var\n"; static $staticVar = "descendant's static var\n"; function publicMethod(){ echo "this is descendant's public method\n"; // is $this is set up if(isset($this)){ echo "publicMethod is in object context\n"; }else{ echo "publicMethod is in static context\n"; } } static function staticMethod(){ echo "this is descendant's static method\n"; // is $this is set up if(isset($this)){ echo "staticMethod is in object context\n"; }else{ echo "staticMethod is in static context\n"; } } } $ancestor = new Ancestor(); $descendant = new Descendant(); // From Outside Of An Instance/Class: // access to properties echo $descendant->publicVar; // descendant's public var echo $descendant::$staticVar; // descendant's static var echo $descendant->staticVar; // descendant's public var //echo $descendant::$publicVar; // fatal error: Access to undeclared static property: Descendant::$publicVar //echo Ancestor::$publicVar; // fatal error: Access to undeclared static property echo Ancestor::$staticVar; //ancestor's static var //echo Descendant::$publicVar; // fatal error: Access to undeclared static property echo Descendant::$staticVar; // descendant's static var // access to methods //$ancestor-> //Ancestor::publicMethod();