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PHP : Function Reference : Class/Object Functions : get_class_vars

get_class_vars

Get the default properties of the class (PHP 4, PHP 5)
array get_class_vars ( string class_name )

Get the default properties of the given class.

Parameters

class_name

The class name

Return Values

Returns an associative array of default public properties of the class. The resulting array elements are in the form of varname => value.

ChangeLog

Version Description
Prior to 4.2.0 Uninitialized class variables will not be reported by get_class_vars()

Examples

Example 376. get_class_vars() example

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<?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";
}

?>

The above example will output:

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// Before PHP 4.2.0
var2 : xyz
var3 : 100

// As of PHP 4.2.0
var1 :
var2 : xyz
var3 : 100


See Also
get_class_methods()
get_object_vars()

Related Examples ( Source code ) » get_class_vars

Examples ( Source code ) » get_class_vars

Code Examples / Notes » get_class_vars

phpnet
This is one of the best php functions. Look at what you can do
class Object
{
  var $updtFields;//keep track of affected values
  function Object($record="") {
      if (is_array($record))
      {
         $this->updtFields = array();
         foreach(array_keys(get_class_vars(get_class($this))) as $k)
         if (isset($record[$k]))
        {
         $this->$k = $record[$k];
         $this->updtFields[] = $k;
        }
     }
  }//end of arrayToObject
 
  function toDebug($nl='
')
  {
      foreach(array_keys(get_class_vars(get_class($this))) as $k)
      echo "$k = [" . $this->$k . "]{$nl}";
   }//end of toDebug  
}
Now you can do really cool things. If you have a form like
<form action="" method="post">
 <input type="text" name="name" />
 <input type="text" name="phone" />
 <input type="submit" />
</form>
and you define your class like this
class Person extends Object{
 var $name; //same same as in the form
 var $phone;
}
when you submmit the form, you can get the data like
$person = new Person($_POST);
//everything in just one line,cool!! Also if you use pear db or adodb when you get data from the database you can do the same thing except use the $row that you get from the database. Remember to ask the result is associative mode.
This is my core Object for everthing I do and it works great.

alan_k
in PHP5 to get all the vars (including private etc.) use:
$reflection = new ReflectionClass($class);
$defaults = $reflection->getdefaultProperties();

rec
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

bernd
If you assign a constant value using the self-scope by default to a variable, get_class_vars() will result in a FATAL error.
Example:
<?PHP
 class Foo {
   const Bar = "error";
   
   public $Foo = self::Bar;
 }
 
 print_r(get_class_vars("Foo"));
?>
... but using "Foo::Bar" instead "self::Bar" will work ;)

gizmobits
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
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).

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