<code class="php">if ( ! function_exists('get_config'))
{
/**
* Loads the main config.php file
*
* This function lets us grab the config file even if the Config class
* hasn't been instantiated yet
*
* @param array
* @return array
*/
function &get_config(Array $replace = array())
{
static $config;
if (empty($config))
{
$file_path = APPPATH.'config/config.php';
$found = FALSE;
if (file_exists($file_path))
{
$found = TRUE;
require($file_path);
}
// Is the config file in the environment folder?
if (file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config.php'))
{
require($file_path);
}
elseif ( ! $found)
{
set_status_header(503);
echo 'The configuration file does not exist.';
exit(3); // EXIT_CONFIG
}
// Does the $config array exist in the file?
if ( ! isset($config) OR ! is_array($config))
{
set_status_header(503);
echo 'Your config file does not appear to be formatted correctly.';
exit(3); // EXIT_CONFIG
}
}
// Are any values being dynamically added or replaced?
foreach ($replace as $key => $val)
{
$config[$key] = $val;
}
return $config;
}
}
// ------------------------------------------------------------------------
if ( ! function_exists('config_item'))
{
/**
* Returns the specified config item
*
* @param string
* @return mixed
*/
function config_item($item)
{
static $_config;
if (empty($_config))
{
// references cannot be directly assigned to static variables, so we use an array
$_config[0] =& get_config();
}
return isset($_config[0][$item]) ? $_config[0][$item] : NULL;
}
}</code>$_config[0] =& get_config();和function &get_config(Array $replace = array())裡面&符號的作用不太理解= =這裡使用&裡面
回覆內容：
<code class="php">if ( ! function_exists('get_config'))
{
/**
* Loads the main config.php file
*
* This function lets us grab the config file even if the Config class
* hasn't been instantiated yet
*
* @param array
* @return array
*/
function &get_config(Array $replace = array())
{
static $config;
if (empty($config))
{
$file_path = APPPATH.'config/config.php';
$found = FALSE;
if (file_exists($file_path))
{
$found = TRUE;
require($file_path);
}
// Is the config file in the environment folder?
if (file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config.php'))
{
require($file_path);
}
elseif ( ! $found)
{
set_status_header(503);
echo 'The configuration file does not exist.';
exit(3); // EXIT_CONFIG
}
// Does the $config array exist in the file?
if ( ! isset($config) OR ! is_array($config))
{
set_status_header(503);
echo 'Your config file does not appear to be formatted correctly.';
exit(3); // EXIT_CONFIG
}
}
// Are any values being dynamically added or replaced?
foreach ($replace as $key => $val)
{
$config[$key] = $val;
}
return $config;
}
}
// ------------------------------------------------------------------------
if ( ! function_exists('config_item'))
{
/**
* Returns the specified config item
*
* @param string
* @return mixed
*/
function config_item($item)
{
static $_config;
if (empty($_config))
{
// references cannot be directly assigned to static variables, so we use an array
$_config[0] =& get_config();
}
return isset($_config[0][$item]) ? $_config[0][$item] : NULL;
}
}</code>登入後複製登入後複製$_config[0] =& get_config();和function &get_config(Array $replace = array())裡面
符號的作用不太理解= =這裡使用
&
裡面
&
&
裡面&
符號的作用不太理解= =這裡使用
&🎜有什麼特別的作用麼= =求解~🎜 🎜 🎜引用傳遞和引用返回，一定程度上能節省記憶體空間，同時還可以達到間接修改目標值的情況。 🎜引用傳遞官方文件：http://www.php.net/manual/zh/language.references.pass.php🎜引用回傳官方文件：http://php.net/manual/zh/language.references.return .php🎜 🎜這裡我針對函數引用返回，拓展個例子🎜<code>function &get_config()
{
static $config = 0;
$config += 1;
echo sprintf("config=%d\n",$config);
return $config;
}
$config_item = get_config();
$config_item = 100;
$config_item = get_config();
$config_item = &get_config(); // 注意这里的&
$config_item = 100;
$config_item = get_config();
//输出
config=1
config=2
config=3
config=101</code><code class="php">//它们都指向静态全局变量$config的zval $config1 = &get_config(); $config2 = &get_config();</code>
