我有一个问题，在我的一个elseif语句上有两个返回值。请看一下我的代码：
class Connection_model extends CI_Model {
public function establish($target = 'both') {
if ($target == 'sender' || $target == 'receiver' || $target == 'both') {
$this->validate($target);
if ($this->validated) {
if ($target == 'sender') {
$this->propertySetter('sender');
return $this->load->database($this->define_database('sender'), TRUE);
}
elseif ($target == 'receiver') {
$this->propertySetter('receiver');
return $this->load->database($this->define_database('receiver'), TRUE);
}
elseif ($target == 'both') {
$this->propertySetter();
return $this->load->database($this->define_database('sender'), TRUE);
return $this->load->database($this->define_database('receiver'), TRUE);
}
}
else {
echo 'Oops, there is an error! For some reason the property "validated" is not returning true (Connection_model.php)';
}
}
else {
echo 'Error: illegal parameter. Please use sender, receiver or both instead.';
}
}
}
我想做这样的事情：
$connect = new Connection_model();
$query = $connect->establish('sender')->select('first_name, last_name')->get('person');
var_dump($query);
当$connect->establish（'both'）有2个返回值时，我不知道如何使用它。
如果你不能理解我想做什么，这里是完整的代码：
<?php
class Connection_model extends CI_Model {
private $validated;
private $sender_db;
private $sender_host;
private $sender_user;
private $sender_pw;
private $receiver_db;
private $receiver_host;
private $receiver_user;
private $receiver_pw;
private function define_database($target) {
if ($target == 'sender') {
$db['sender'] = array(
'dsn' => '',
'hostname' => $this->sender_host,
'username' => $this->sender_user,
'password' => $this->sender_pw,
'database' => $this->sender_db,
'dbdriver' => 'mysqli',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => TRUE,
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'autoinit' => TRUE,
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
);
return $db['sender'];
}
elseif ($target == 'receiver') {
$db['receiver'] = array(
'dsn' => '',
'hostname' => $this->receiver_host,
'username' => $this->receiver_user,
'password' => $this->receiver_pw,
'database' => $this->receiver_db,
'dbdriver' => 'mysqli',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => TRUE,
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'autoinit' => TRUE,
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
);
return $db['receiver'];
}
}
// Validate the connection(s)
private function validate($target = 'both') {
// Allowed parameters as string: sender, receiver, both
// Go through all parameters and define an array
if ($target == 'sender') {
$sessions = array('connection', 'sender_db', 'sender_host', 'sender_user', 'sender_pw');
}
elseif ($target == 'receiver') {
$sessions = array('connection', 'receiver_db', 'receiver_host', 'receiver_user', 'receiver_pw');
}
elseif ($target == 'both') {
$sessions = array('connection', 'sender_db', 'sender_host', 'sender_user', 'sender_pw', 'receiver_db', 'receiver_host', 'receiver_user', 'receiver_pw');
}
else {
echo 'Error: illegal parameter. Please use sender, receiver or both instead.';
}
// Check if all keys from the array are saved in session
if (isset($sessions)) :
foreach ($sessions as $value) {
if (key_exists($value, $this->session->get_userdata())) {
$this->validated = true;
}
}
endif;
}
// This method will set the correct properties
private function propertySetter($target = 'both') {
if ($target == 'sender') {
$this->sender_db = $this->session->userdata('sender_db');
$this->sender_host = $this->session->userdata('sender_host');
$this->sender_user = $this->session->userdata('sender_user');
$this->sender_pw = $this->session->userdata('sender_pw');
}
elseif ($target == 'receiver') {
$this->receiver_db = $this->session->userdata('receiver_db');
$this->receiver_host = $this->session->userdata('receiver_host');
$this->receiver_user = $this->session->userdata('receiver_user');
$this->receiver_pw = $this->session->userdata('receiver_pw');
}
elseif ($target == 'both') {
$this->sender_db = $this->session->userdata('sender_db');
$this->sender_host = $this->session->userdata('sender_host');
$this->sender_user = $this->session->userdata('sender_user');
$this->sender_pw = $this->session->userdata('sender_pw');
$this->receiver_db = $this->session->userdata('receiver_db');
$this->receiver_host = $this->session->userdata('receiver_host');
$this->receiver_user = $this->session->userdata('receiver_user');
$this->receiver_pw = $this->session->userdata('receiver_pw');
}
}
// Establish one or many connections
public function establish($target = 'both') {
if ($target == 'sender' || $target == 'receiver' || $target == 'both') {
$this->validate($target);
if ($this->validated) {
if ($target == 'sender') {
$this->propertySetter('sender');
return $this->load->database($this->define_database('sender'), TRUE);
}
elseif ($target == 'receiver') {
$this->propertySetter('receiver');
return $this->load->database($this->define_database('receiver'), TRUE);
}
elseif ($target == 'both') {
$this->propertySetter();
return $this->load->database($this->define_database('sender'), TRUE);
return $this->load->database($this->define_database('receiver'), TRUE);
}
}
else {
echo 'Oops, there is an error! For some reason the property "validated" is not returning true (Connection_model.php)';
}
}
else {
echo 'Error: illegal parameter. Please use sender, receiver or both instead.';
}
}
}
您可能想要返回一个数组：
return array('sender' => $this->load->database($this->define_database('sender'), TRUE),
'receiver' => $this->load->database($this->define_database('receiver'), TRUE)
);
通过您的呼叫，您将获得类似$query['sender']和$query['receiver']:的阵列
$query = $connect->establish('sender')->select('first_name, last_name')->get('person');
或者您可以使用list:
list($sender, $receiver) = $connect->establish('both')->select('first_name, last_name')->get('person');
在您的示例中，elseif ($target == 'both')只返回发送方。一旦你回来，就不能再回来了！就像AbraCadaver建议的那样：返回一个数组。在您的示例中，它看起来像：
public function establish($target = 'both') {
if ($target == 'sender' || $target == 'receiver' || $target == 'both') {
$this->validate($target);
if ($this->validated) {
if ($target == 'sender') {
$this->propertySetter('sender');
return $this->load->database($this->define_database('sender'), TRUE);
} elseif ($target == 'receiver') {
$this->propertySetter('receiver');
return $this->load->database($this->define_database('receiver'), TRUE);
} elseif ($target == 'both') {
$this->propertySetter();
return array(
$this->load->database($this->define_database('sender'), TRUE),
$this->load->database($this->define_database('receiver'), TRUE)
);
}
} else {
echo 'Oops, there is an error! For some reason the property "validated" is not returning true (Connection_model.php)';
}
} else {
echo 'Error: illegal parameter. Please use sender, receiver or both instead.';
}
}