我想我应该对上面的一些回复进行扩展....

class nameCheck{

public $name;

public function __construct(){
    $this->name = $name;
}

function firstName(){
            // If a name has been entered..
    if(!empty($this->name)){
        $name = $this->name;
        $errflag = false;
                    // Return a array with both the name and errflag
        return array($name, $errflag);
            // If its empty..
    }else if(empty($this->name)){
        $errmsg = 'Please enter a name.';
        $errflag = true;
                    // Return both the Error message and Flag
        return array($errmsg, $errflag);
    }
}

}


if($_POST['submit']){

$a = new nameCheck;
$a->name = $_POST['name'];
//  Assign a list of variables from the firstName function
list($name, $err) = $a->firstName();

// Display the values..
echo 'Name: ' . $name;
echo 'Errflag: ' . $err;
}

?>
<form method="post" action="<?php $_SERVER['PHP_SELF']; ?>" >
<input name="name"  />
<input type="submit" name="submit" value="submit" />
</form>

这将为您提供一个输入字段和提交按钮，一旦提交，如果名称输入字段为空，它将返回错误标志和一条消息。如果name字段有值，它将返回值/name，如果false =无错误，则返回错误标志0。 希望这能有所帮助!

在数组中添加所有变量，然后最终返回数组。

function test($testvar)
{
  // do something
  return array("var1" => $var1, "var2" => @var2);
}

然后

$myTest = test($myTestVar);
//$myTest["var1"] and $myTest["var2"] will be usable

上面的绿色勾号给出的答案实际上是不正确的。如果返回一个数组，则可以在PHP中返回多个值。请看下面的示例代码:

<?php

function small_numbers()
{
    return array (0, 1, 2);
}

list ($zero, $one, $two) = small_numbers();

这段代码实际上是从PHP网站上的以下页面复制的:http://php.net/manual/en/functions.returning-values.php 我自己也使用过很多次相同类型的代码，所以可以确认它是好的，它可以工作。

这是最简单的方法:

public function selectAllUsersByRole($userRole, $selector) {

    $this->userRole = $userLevel;
    $this->selector = $selector;

    $sql = "SELECT * FROM users WHERE role <= ? AND del_stat = 0";
    $stm = $this->connect()->prepare($sql); // Connect function in Dbh connect to database file
    $stm->execute([$this->userRole]); // This is PHP 7. Use array($this->userRole) for PHP 5

    $usersIdArray = array();
    $usersFNameArray = array();
    $usersLNameArray = array();

    if($stm->rowCount()) {
        while($row = $stm->fetch()) {

            array_push($usersIdArray,    $row['id']);
            array_push($usersFNameArray, $row['f_name']);
            array_push($usersLNameArray, $row['l_name']);

            // You can return only $row['id'] or f_name or ...
            // I used the array because it's most used.
        }
    }
    if($this->selector == 1) {
        return $usersIdArray;
    }elseif($this->selector == 2) {
        return $usersFNameArray;
    }elseif($this->selector == 3) {
        return $usersLNameArray;
    }

}

我们如何调用这个函数呢?

$idData = $selectAllUsers->selectAllUsersByLevel($userRole, 0);
print_r($idData);
$idFName = $selectAllUsers->selectAllUsersByLevel($userRole, 1);
print_r($idFname);

就是这样。非常容易。

在PHP 5.5中还有一个新概念:生成器，你可以从一个函数中产生多个值:

function hasMultipleValues() {
    yield "value1";
    yield "value2";
}

$values = hasMultipleValues();
foreach ($values as $val) {
    // $val will first be "value1" then "value2"
}

我想eligo已经解释得很清楚了。但如果你想返回两个值，把它们放到一个数组中并返回。

function test($testvar)
{
  // do something

  return array('var1'=>$var1,'var2'=>$var2);
//defining a key would be better some times   
}

//访问返回值

$returned_values = test($testvar);

echo $returned_values['var1'];
echo $returned_values['var2'];