如何在PHP中将foreach转换为if答案

【问题标题】：How to convert foreach to if in Php如何在PHP中将foreach转换为if
【发布时间】：2013-07-06 01:52:33
【问题描述】：

我想将 foreach 转换为 if 语句，因为 mysql 查询只返回一行。所以我想使用 if 而不是 foreach

    $db = new db();
    $db -> serverconnection();

    $item = $_GET["name"];

    $query = "SELECT c.firstname,c.phonenumber,c.address FROM `order` o,customerdetails c WHERE o.ordercode = '$item' AND c.sno=o.customerid";

        $results = $db->selectQuery($query);


            foreach ($results as $customerdetails)
            {
                $orderidDetail = $customerdetails['customerid'];
                echo $customerdetails["firstname"];
                echo $customerdetails["phonenumber"];
                echo $customerdetails["address"];       
           }

【问题讨论】：

如果它的目的是什么？

标签： php if-statement for-loop

【解决方案1】：

使用current。

$customerdetails = current($results);
if($customerdetails)
    {
    $orderidDetail = $customerdetails['customerid'];
    echo $customerdetails["firstname"];
    echo $customerdetails["phonenumber"];
    echo $customerdetails["address"];       
    }

【讨论】：

【解决方案2】：

类似

if (count($results) == 1) { 
   ... single row of results ...
} else {
   foreach(...) { ... multiple rows ...}
}

也许？

但如果您知道查询只会返回一行，那么无论如何您根本就不需要 if/foreach。

【讨论】：

【解决方案3】：

改变

foreach ($results as $customerdetails)
{
    $orderidDetail = $customerdetails['customerid'];
    echo $customerdetails["firstname"];
    echo $customerdetails["phonenumber"];
    echo $customerdetails["address"];

}

到

if(isset($results[0]))
{
    $orderidDetail = $results[0]['customerid'];
    echo $results[0]["firstname"];
    echo $results[0]["phonenumber"];
    echo $results[0]["address"];

}

【讨论】：