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<?php class Ancestor { public $publicVar = "ancestor's public var\n"; static $staticVar = "ancestor's static var\n"; function publicMethod(){ echo "ancestor's publicMethod "; // is $this is set up if(isset($this)){ echo "is in object context\n"; }else{ echo "is in static context\n"; } } static function staticMethod(){ echo "ancestor's staticMethod "; // is $this is set up if(isset($this)){ echo "in object context\n"; }else{ echo "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 "descendant's publicMethod "; // is $this is set up if(isset($this)){ echo "in object context\n"; }else{ echo "in static context\n"; } } static function staticMethod(){ echo "descendant's staticMethod\n"; // is $this is set up if(isset($this)){ echo "in object context\n"; }else{ echo "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 $descendant->staticVar; // "" + notice: Undefined property: Descendant::$staticVar echo $descendant::$staticVar; // descendant's static 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 $descendant->publicMethod(); $descendant->staticMethod(); $descendant::staticMethod(); $descendant::publicMethod(); //Ancestor::publicMethod();
based on l8Gj2
Output for 7.0.0 - 7.2.0
descendant's public var Notice: Accessing static property Descendant::$staticVar as non static in /in/6pbGV on line 57 Notice: Undefined property: Descendant::$staticVar in /in/6pbGV on line 57 descendant's static var ancestor's static var descendant's static var descendant's publicMethod in object context descendant's staticMethod in static context descendant's staticMethod in static context Deprecated: Non-static method Descendant::publicMethod() should not be called statically in /in/6pbGV on line 70 descendant's publicMethod in static context
Output for 5.3.18 - 5.6.28
descendant's public var Strict Standards: Accessing static property Descendant::$staticVar as non static in /in/6pbGV on line 57 Notice: Undefined property: Descendant::$staticVar in /in/6pbGV on line 57 descendant's static var ancestor's static var descendant's static var descendant's publicMethod in object context descendant's staticMethod in static context descendant's staticMethod in static context Strict Standards: Non-static method Descendant::publicMethod() should not be called statically in /in/6pbGV on line 70 descendant's publicMethod in static context