mysql php if else inside while循环

Question

$sql = mysql_query("SELECT DISTINCT business_region FROM business WHERE business_category='occupation'");
// count the output amount
$businessCount = mysql_num_rows($sql);
if ($businessCount > 0) {
  while ($row = mysql_fetch_array($sql)) { 
      $business_region = $row["business_region"];          
      $Region_view .= "display value";
  }
}

这给出了以下结果：

  

密歇根州多伦多俄亥俄州曼彻斯特伦敦悉尼巴黎

我想选择仅 Ohio and London 作为变量值：

$Region_view .

也许我可以使用if else结构，但我无法让它工作。

即。我需要选择 仅Ohio, London

我可以使用联合MySQL语句来做到这一点，但它太慢了所以我需要并要求采用不同的方式。

Answer 1

$sql = mysql_query("SELECT DISTINCT business_region FROM business WHERE business_category ='occupation'");
// count the output amount
$businessCount = mysql_num_rows($sql); 
if ($businessCount > 0) {
  while($row = mysql_fetch_array($sql)){ 
    $business_region = $row["business_region"];         
    if ($business_region == 'Ohio' || $business_region == 'London') // added
    $Region_view .= $business_region;//changed
  }
}