duandan4680
2017-01-23 09:22
浏览 46
已采纳

在php函数中使用变量返回值

I have a function that is supposed to give me a staff members name from his ID number so my php is like this

$staffId = $_GET['staff_id'];
$staff = staff_load($staffId);

and my function is like this

function staff_load()
{
$dbh = dbh_get(); //connects to database

$sql = 'select user_name from user_staff where user_id = ?';
$stmt = $dbh->prepare($sql);
$stmt->execute();
$staff = $stmt->fetch();

dbh_free($dbh); //disconnects from database
return $staff;
}

But when I try and use the $staff variable, it shows nothing. I can't work out what I'm doing wrong. I've tried a bunch of variants and gotten nowhere except frustrated.

<td>Book for ' . $staff . '</td>

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我有一个函数,应该从他的身份证号码给我一个工作人员姓名所以我的php就像这样

  $ staffId = $ _GET ['staff_id']; 
 $ staff = staff_load($ staffId); 
   
 
  

我的函数是这样的

  function staff_load()
 {
 $ dbh = dbh_get();  //连接到数据库
 
 $ sql ='从user_staff中选择user_name,其中user_id =?'; 
 $ stmt = $ dbh-&gt; prepare($ sql); 
 $ stmt-&gt; execute();  
 $ staff = $ stmt-&gt; fetch(); 
 
dbh_free($ dbh);  //断开与数据库
return $ staff; 
} 
   
 
 

但是当我尝试使用$ staff变量时,它什么也没显示。 我无法弄清楚我做错了什么。 我已经尝试了一堆变种,除了受挫之外没有任何变化。

 &lt; td&gt; Book for'。  $ staff。  '&lt; / td&gt; 
   
 
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2条回答 默认 最新

  • doudi4621 2017-01-23 09:29
    已采纳

    First, you forgot to include the parameter in your function definition:

    function staff_load($id) {
    

    Then you need to bind the parameter of the prepared statement.

    $sql = 'select user_name from user_staff where user_id = $1';
    $stmt = $dbh->prepare($sql);
    $stmt->execute(array($id));
    

    Next, fetch() returns an array, you need to extract the user_name element from the array:

    $row = $stmt->fetch();
    if ($row) {
        $staff = $row['user_name'];
    } else {
        $staff = false;
    }
    
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  • douwo8358 2017-01-23 09:27

    first of all you have to pass parameter to staff_load function

    function staff_load($staffId)
    

    secondly you should bind parameter

    $sql = 'select user_name from user_staff where user_id = :user_id';
    $stmt = $dbh->prepare($sql);
    $stmt->bindParam(':user_id', $staffId);
    
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