php反射函数

Jun 23, 2016 pm 02:30 PM

最常用的几个个php反射函数 get_class get_class_methods

1. get_class ? 返回对象的类名

string get_class ([ object $obj ] )

返回对象实例 obj 所属类的名字。如果 obj 不是一个对象则返回 FALSE。

Note: 在 PHP 扩展库中定义的类返回其原始定义的名字。在 PHP 4 中 get_class() 返回用户定义的类名的小写形式,但是在 PHP 5 中将返回类名定义时的名字,如同扩展库中的类名一样。

Note: 自 PHP 5 起,如果在对象的方法中调用则 obj 为可选项。

Example#1 使用 get_class()


class foo {
    function foo()
    {
    // implements some logic
    }

    function name()
    {
        echo "My name is " , get_class($this) , "/n";
    }
}

// create an object
$bar = new foo();

// external call
echo "Its name is " , get_class($bar) , "/n";

// internal call
$bar->name();

?>

上例将输出:

Its name is foo My name is foo
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2.get_class_methods ? 返回由类的方法名组成的数组
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说明

array get_class_methods ( mixed $class_name )

返回由 class_name 指定的类中定义的方法名所组成的数组。如果出错,则返回 NULL。

Example#1 get_class_methods() 示例


class myclass {
// constructor
function myclass()
{
return(true);
}

// method 1
function myfunc1()
{
return(true);
}

// method 2
function myfunc2()
{
return(true);
}
}

$class_methods = get_class_methods('myclass');
// or
$class_methods = get_class_methods(new myclass());

foreach ($class_methods as $method_name) {
echo "$method_name/n";
}

?>

上例将输出:

myclass myfunc1 myfunc2 
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3.

get_class_vars ? 返回由类的默认属性组成的数组

说明

array get_class_vars ( string $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


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";
}

?>

上例将输出:

// 在 PHP 4.2.0 之前 var2 : xyz var3 : 100 // 从 PHP 4.2.0 开始 var1 : var2 : xyz var3 : 100 
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