Question

如何从mysqli_fetch_assoc获取特定值并从下面的代码中的函数返回它们？

具体来说，我在单击提交按钮时尝试同时从db_select（）返回$ CID和$ Fname。

    function db_query($sql){
        $con = db_connect();
        $result = mysqli_query($con,$sql);
        return $result;
    }

    function db_select($sql){  
        $rows = array();
        $result = db_query($sql);
            if(!$result){
                return false;
            }
            while($row = mysqli_fetch_assoc($result)){
                $CID = $row['C_ID'];
                $Fname = $row['C_Fname'];
                $rows = $CID;
            }
        return $rows;
    }       

    if (isset($_POST['submit'])){
         echo $rows=db_select("SELECT C_ID,C_Fname FROM Customer WHERE C_Email='$Email'")
       //how to also return $Fname?
    }

Answer 1

db_select函数返回一个完整的数组，所以很可能你想要访问这两个变量，如下所示：

function db_select($sql){  
    $rows = array();
    $result = db_query($sql);
        if(!$result){
            return false;
        }

        // This function could potentially return multiple rows...
        while($array = mysqli_fetch_assoc($result)){
            // This will return multiple rows
            $row[] = $array;
        }

        // This will return only one row
        // (but there may be more that you are missing)
    //  $row = mysqli_fetch_assoc($result)

    // Notice change here
    return $row;
}       

if (isset($_POST['submit'])){
     $rows = db_select("SELECT C_ID,C_Fname FROM Customer WHERE C_Email='$Email'")

     // If you have the one row option you echo like so
 //     echo $rows['C_ID'];
 //     echo $rows['C_Fname'];

     // For multiple row option, do a foreach or if you know the key you can access it directly
     foreach($rows as $arrays) {
             echo $arrays['C_ID'];
             echo $arrays['C_Fname'];
         }

}

Answer 2

根据the documentation：

函数不能返回多个值，但返回数组可以获得类似的结果。

另请参阅文档中的示例＃2。

在您的情况下，您可以return $row;。但是，从您的代码中，您尝试收集多行的结果。此示例收集数组$rows中的所有单独行：

while($row = mysqli_fetch_assoc($result)){
    $rows[] = $row;
}
return $rows;

Answer 3

试试这个。

function db_select($sql){  
        $rows = array();
        $result = db_query($sql);
        if(!$result){
            return false;
         }else{
            $row = mysqli_fetch_assoc($result);
            return $row;
         }
}  

if (isset($_POST['submit'])){
     $rows = db_select("SELECT C_ID,C_Fname FROM Customer WHERE C_Email='$Email'")
     echo $rows['C_ID'];
     echo $rows['C_Fname'];
}

使用mysqli_fetch_assoc从函数返回多个值

3 个答案: