PHPJa的开发效率高在哪？

<?php Route::get('list',function(Request$request){ $otherWhere=json_decode( fil_get_content("xxxx.api?getwhere={$request['otherWhere']}") ); if(!$otherWhere){ retn"error"; } retnjson_encode( D::tale('A') ->leftJoin('','A.id=.id') ->leftJoin('C','A.cid=C.id') ->leftJoin('D','A.did=D.id') ->leftJoin('E','A.eid=E.id') ->leftJoin('E','A.eid=E.id') ->field('A.id,.id,xx,xx,xx,xx') ->where('A.id','=',$request->get('aid')) ->where('.id','>',$request->get('id')) ->where('xxx','=',$otherWhere['xxx']) ->page($request->get('pageIndex'),$request->get('pageNum')); ); })