摆脱嵌套的foreach循环

Question

最近我遇到了一些有关嵌套foreach循环的恼人问题。

有人能指出我正确的方向还是给我一些提示如何正确摆脱嵌套的foreach循环？到目前为止，我已经将嵌套的foreach转移到了Doctor类中，并在那里进行了所有诊断迭代......但似乎并不是理想的方法......我在这里缺少一些基本上不为deing模式设计的东西？

  Class Treatment { 


 /**
 *  get Diagnosis and releated Doctors information (this is an temporary approach)
 */
public function getDiagnosis(){

    $diagnosisContainer = [];
    foreach($this->doctorIterator as $key => $doc){ //iterate all doctors
        //how to get rid of this nested foreach ?
        foreach($doc->getCurrentDiagnosis() as $diagnosis) { //iterate all diagnosis
            $std = new \StdClass();
            $std->docType      = $doc->getType();
            $std->docLastname  = $doc->getLastname();
            $std->docFirstname = $doc->getFirstname();
            $std->diagnosis    = $diagnosis;
            $diagnosisContainer = array_merge([$std], $diagnosisContainer);
        }
    }
    return $diagnosisContainer;
}  }

到目前为止，这是我提出的解决方案，其中迭代器仅移入Doctor类，但对我来说通常是相同的。

 public function getDiagnosis($type = 0){

    $diagnosisContainer = [];
    foreach($this->doctorIterator as $key => $doc){ //iterate all doctors

        $diagnosisContainer = array_merge($diagnosisContainer, $doc->getDiagnosisWithDoctor());  }