<?php abstract class BaseLib { abstract protected function process( $a ); } class MyLib extends BaseLib { //protected $a; protected string $a; public function run( string $a ) { $this->process( $a ); } protected function process( $a ) { $this->a = $a; } } class ThirdParty extends MyLib { public function run( string $a = null ) { $this->process( $a ); } } $third_party_code = new ThirdParty(); $third_party_code->run();
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