get_class

描述

array get_class_vars ( string class_name )

返回由类的默认属性组成的关联数组，此数组的元素以 varname => value 的形式存在。

注: 在 PHP 4.2.0 之前，get_class_vars() 不会包含未初始化的类变量。

例子 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; // constructor function myclass() { 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"; } ?>

运行结果：

// 在 PHP 4.2.0 之前
var2 : xyz
var3 : 100

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

参见 get_class_methods()、 get_object_vars()

add a note User Contributed Notes

gizmobits at hotmail dot com
04-Mar-2006 11:48


I wanted a simple ToString() function that was automatic and class independent.  I wanted to dump it into any of several classes and get values quickly.  I wanted to leave it there so I could customize it for each class, so an outside function wasn't suitable.  I came up with this and thought it might be useful.  Have fun!



<?php

  function ToString () {

    $s = "";

    $s .= "<table>\n";

    $s .= "<tr><td colspan=2><hr></td></tr>\n";

    foreach (get_class_vars(get_class($this)) as $name => $value) {

      $s .= "<tr><td>$name:</td><td>" . $this->$name . "</td></tr>\n";

    }

    $s .= "<tr><td colspan=2><hr></td></tr>\n";

    $s .= "</table>\n";

    return $s;

  }



?>

php dot net at sharpdreams dot com
25-Oct-2005 09:25


Contrary to multiple comments throughout the manual, get_class_vars() performed within a class can access any public, protected, and private members.



<?php

class Foo {

   public $x;

   protected $y;

   private $z;

   public function __sleep() {

      return( get_class_vars( __CLASS__ ) );

   }

}

?>



works fine (returns x, y, & z). However, given the same class as above,



<?php

print_r( get_class_vars( "Foo" ) );

?>



will NOT return x, y, & z. Instead it will only return the public members (in our case, z).

alan_k at php dot net
22-Jan-2005 11:23


in PHP5 to get all the vars (including private etc.) use:



$reflection = new ReflectionClass($class);

$defaults = $reflection->getdefaultProperties();

rec at NOSPAM dot instantmassacre dot com
24-Jan-2003 08:23


If you want to retrieve the class vars from within the class itself, use $this.



<?php

class Foo {



    var $a;

    var $b;

    var $c;

    var $d;

    var $e;



    function GetClassVars()

    {

        return array_keys(get_class_vars(get_class($this))); // $this

    }



}



$Foo = new Foo;



$class_vars = $Foo->GetClassVars();



foreach ($class_vars as $cvar)

{

    echo $cvar . "<br />\n";

}

?>



Produces, after PHP 4.2.0, the following:



a

b

c

d

e

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