生成随机数而不重复

Question

我想生成6位数的随机数并检查它是否在表中，如果它存在则生成另一个6位数的随机数并再次检查等等......代码wriiten正在跟随，

$querySel1=mysqli_query($connect, "select dynamic_email_id from logis_contacts");
while($row = mysqli_fetch_row($querySel1)){
  $dynamic_id[] = $row[0];              
}
$number = mt_rand( 100000, 999999);
dynamicEmailId($number, $dynamic_id);


function dynamicEmailId($number, $dynamic_id){
  if( in_array($number, $dynamic_id) ){     
     $new  = mt_rand( 100000, 999999);
     dynamicEmailId($new, $dynamic_id);// here i am confused
   }
  else {
    echo $number;
  }
}

请建议更好的方法来实现这个目标

Answer 1

*没关系，请检查

function generateUniqueId($number,$fetchArray) {
  if (!in_array($number,$fetchArray)) { 
    return $number;
  }
  else {
    $newNumber  = mt_rand( 100000, 999999);
    return generateUniqueId($newNumber, $fetchArray);
  }
 }