我怎样才能恢复使用PHP

Question

foreach循环大于1倍的值这里是我的功能

function GetUser($id) 
{ 
    global $pdo; 
    $stmt = $pdo->prepare('SELECT lname,fname,mi FROM user WHERE id = :id LIMIT 1'); 
    $stmt->execute(array(':id'=>$id)); 
    foreach($stmt as $name){ 
     $lname = $name['lname']; 
     $lname = $name['fname']; 
     $mi = $name['mi']; 
    } 

    return //what to put here? 
} 

这里是我的代码使用的功能

include 'function.php'; 
$names = GetUser($_SESSION['id']); 
//what's next? 

我怎样才能检索到的$ L-NAME，$函数中的fname和$ mi？需要任何帮助和建议。谢谢:)

Answer 1

对于初学者不要使用global keyword，但注入你需要的变量。第二你为什么不返回数组？：

function getUser($pdo, $id) 
{ 
    $stmt = $pdo->prepare('SELECT lname,fname,mi FROM user WHERE id = :id LIMIT 1'); 
    $stmt->execute(array(':id'=>$id)); 

    $result = array(); 
    foreach($stmt as $name){ 
     $result['lname'] = $name['lname']; 
     $result['fname'] = $name['fname']; 
     $result['mi'] = $name['mi']; 
    } 

    return $result; 
} 

$result = getUser($pdo, 1); 
var_dump($result); 

请注意，这只会返回最后结果。如果你想要这一切：

function getUser($pdo, $id) 
{ 
    $stmt = $pdo->prepare('SELECT lname,fname,mi FROM user WHERE id = :id LIMIT 1'); 
    $stmt->execute(array(':id'=>$id)); 

    return $stmt->fetchAll(); 
} 

$result = getUser($pdo, 1); 
var_dump($result); 

另外请注意，我已经让你的函数名称以一个普通的字母而不是大写。 “正常”的命名约定是类以一个大写字母开头，但函数/方法与正常的名字相同。

如果要检索基础上，第一个解决方案的信息，你会怎么做：

echo $result['lname']; 

如果要检索基础上，第二个解决方案的信息，你会怎么做：

echo $result[0]['lname']; 

Answer 2

return array(
    "lname" => $lname, 
    "fname" => $fname, 
    "mi" => $mi 
); 

Answer 3

function GetUser($id) { 
    global $pdo; 
    $stmt = $pdo->prepare('SELECT lname,fname,mi FROM user WHERE id = :id LIMIT 1'); 
    $stmt->execute(array(':id'=>$id)); 
    return $stmt; 
} 


include 'function.php'; 
$names = GetUser($_SESSION['id']); 
foreach($names as $name){ 
    $lname = $name['lname']; 
    $lname = $name['fname']; 
    $mi = $name['mi']; 
} 

没有测试，但我认为它应该工作

Answer 4

function GetUser($id) 
{ 
    global $pdo; 
    $stmt = $pdo->prepare('SELECT lname,fname,mi FROM user WHERE id = :id LIMIT 1'); 
    $stmt->execute(array(':id'=>$id)); 
    return count($stmt)==1?$stmt[0]:null; //you may have nothing returned from the database so return null 
} 

然后：

include 'function.php'; 
$names = GetUser($_SESSION['id']); 
if ($names){ //if this is not null then get the properties 
echo $names['fname']; 
echo $names['lname']; 
echo $names['mi']; 
} 

Answer 5

function GetUser($id) 
{ 
    global $pdo; 
    $stmt = $pdo->prepare('SELECT lname,fname,mi FROM user WHERE id = :id LIMIT 1'); 
    $stmt->execute(array(':id'=>$id)); 
    foreach($stmt as $name){ 
     $lname = $name['lname']; 
     $lname = $name['fname']; 
     $mi = $name['mi']; 
    } 

    return array(
     "$lname" => $lname, 
     "$fname" => $fname, 
     "$mi" => $mi 
    ); 
} 

这是何等的下一个部分：

include 'function.php'; 
$myArray = GetUser($_SESSION['id']); 
$fname = $myArray["$fname"]; 
$lname = $myArray["$lname"]; 
$mi = $myArray["$mi"]; 

或者：

include 'function.php'; 
$myArray = GetUser($_SESSION['id']); 
$fname = $myArray[0]; 
$lname = $myArray[1]; 
$mi = $myArray[2];