(PHP 4, PHP 5, PHP 7)
get_class_vars — 返回由类的默认属性组成的数组
$class_name
)
返回由类的默认公有属性组成的关联数组，此数组的元素以
varname => value 的形式存在。
Note:
在 PHP 4.2.0 之前，get_class_vars() 不会包含未初始化的类变量。
Example #1 get_class_vars() 示例
<?php
class myclass {
var $var1; // 此变量没有默认值……
var $var2 = "xyz";
var $var3 = 100;
private $var4; // PHP 5
// constructor
function myclass() {
// change some properties
$this->var1 = "foo";
$this->var2 = "bar";
return true;
}
}
$my_class = new myclass();
$class_vars = get_class_vars(get_class($my_class));
foreach ($class_vars as $name => $value) {
echo "$name : $value\n";
}
?>
以上例程会输出：
// 在 PHP 4.2.0 之前 var2 : xyz var3 : 100 // 从 PHP 4.2.0 开始 var1 : var2 : xyz var3 : 100
class_nameThe class name
Returns an associative array of declared properties visible from the
current scope, with their default value.
The resulting array elements are in the form of
varname => value.
In case of an error, it returns FALSE.
| 版本 | 说明 |
|---|---|
| 5.0.3 | Depending on the scope, get_class_vars() will only return the properties that can be accessed from the current scope. |
| 5.0.2 | Calling get_class_vars() will now expose all the properties as an array, unlike previous behaviour where protected and private properties were prefixed with nul bytes. |
| 5.0.1 | Calling get_class_vars() will expose all properties, as when converting an object to a class. |
| Prior to 4.2.0 | Uninitialized class variables will not be reported by get_class_vars() |
Example #2 get_class_vars() example
<?php
class myclass {
var $var1; // this has no default value...
var $var2 = "xyz";
var $var3 = 100;
private $var4; // PHP 5
// constructor
function myclass() {
// change some properties
$this->var1 = "foo";
$this->var2 = "bar";
return true;
}
}
$my_class = new myclass();
$class_vars = get_class_vars(get_class($my_class));
foreach ($class_vars as $name => $value) {
echo "$name : $value\n";
}
?>
以上例程会输出：
// Before PHP 4.2.0 var2 : xyz var3 : 100 // As of PHP 4.2.0 var1 : var2 : xyz var3 : 100
Example #3 get_class_vars() and scoping behaviour
<?php
function format($array)
{
return implode('|', array_keys($array)) . "\r\n";
}
class TestCase
{
public $a = 1;
protected $b = 2;
private $c = 3;
public static function expose()
{
echo format(get_class_vars(__CLASS__));
}
}
TestCase::expose();
echo format(get_class_vars('TestCase'));
?>
以上例程会输出：
// 5.0.0 a| * b| TestCase c a| * b| TestCase c // 5.0.1 - 5.0.2 a|b|c a|b|c // 5.0.3 + a|b|c a