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<?php abstract class parentTest{ protected $innerVar = ''; public function __construct() { if(empty($this->innerVar)){ echo 'too soon'; throw(new Exception('too soon')); } }}abstract class childTest extends parentTest{ protected $outerVar = ''; public function __construct() { if(empty($this->innerVar) || empty($this->outerVar)){ echo 'too soon'; throw(new Exception('too soon')); } }}class implTest extends parentTest{ protected $innerVar = 'hi';}class implChildTest extends childTest{ protected $innerVar = 'hi'; protected $outerVar = 'hello there';}new implTest();new implChildTest();
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