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<?php class AbstractPlatform {} class A { public function convertToDatabaseValueSQL($sqlExpr, AbstractPlatform $platform, $value) { return $sqlExpr; } } class B extends A { public function convertToDatabaseValueSQL($sqlExpr, AbstractPlatform $platform) { return sprintf('ST_GeomFromWkb(%s, %s)', $sqlExpr, 4326); } } $b = new B(); $b->convertToDatabaseValueSQL("test", new AbstractPlatform(), "hop");