PHP返回参考

Question

我试图创建一个函数，它将采取一个数组并创建列和值，但我不知道如何返回与函数的引用。任何帮助表示赞赏。

private function data($data) { 

    $columns = ""; 
    $values = array(); 

    foreach ($data as $column => $value) { 
     $columns .= ($columns == '') ? '' : ', '; 
     $columns .= $column; 
     $values[$column] = &$data[$column]; 
    } 

    return array($columns, $values); 

} 

这是在数据库中插入数据的函数。

/** 
* Insert item into items table. 
* 
* @param (array) $data - Column => value array created in item class. 
*/ 
public function insertItem($data) { 

    $columns = ""; 
    $values = array(); 

    $prep = "isiisiisiiis"; 

    /*foreach ($data as $column => $value) { 
     $columns .= ($columns == '') ? '' : ', '; 
     $columns .= $column; 
     $values[$column] = &$data[$column]; 
    }*/ 

    $theData = $this->data($data); 

    $a = str_repeat('?, ', count($data)); 
    $b = substr_replace($a, '', -2); 

    $q = $this->db->mysqli->prepare("INSERT INTO items ($columns) VALUES ($b)"); 

    call_user_func_array(array($q, 'bind_param'), array_merge(array($prep), $values)); 
    $q->execute(); 
    $q->close(); 

    //return id 
    return $this->db->mysqli->insert_id; 

} 

编辑**工作代码：

private function data(&$data) { 

    $columns = ""; 
    $values = array(); 

    foreach ($data as $column => $value) { 
     $columns .= ($columns == '') ? '' : ', '; 
     $columns .= $column; 
     $values[$column] = &$data[$column]; 
    } 

    return array($columns, $values); 

} 

和访问它像这样：

$theData = $this->data($data); 
$theData[0]; //$columns 
$theData[1]; //$values 

Answer 1

试试这个：在功能PARAM添加&并取出& foreach循环中。

private function data (&$data) 
{ 

    $columns = ""; 
    $values = array(); 

    foreach ($data as $column => $value) 
    { 
     $columns .= ($columns == '') ? '' : ', '; 
     $columns .= $column; 
     $values[$column] = $data[$column]; 
    } 

    return array ($columns, $values); 
} 

公共职能insertItem内取出$theData =

public function insertItem ($data) 
{ 
    [..] 
    $this->data ($data); 
} 

Answer 2

private function data(&$data) { 

    $columns = ""; 
    $values = array(); 

    foreach ($data as $column => $value) { 
     $columns .= ($columns == '') ? '' : ', '; 
     $columns .= $column; 
     $values[$column] = &$data[$column]; 
    } 

    return array($columns, $values); 

} 


$theData = $this->data($data); 
$theData[0]; //$columns 
$theData[1]; //$values