ScotlandPHP

Static Keyword

Tip

This page describes the use of the static keyword to define static methods and properties. static can also be used to define static variables and for late static bindings. Please refer to those pages for information on those meanings of static.

Declaring class properties or methods as static makes them accessible without needing an instantiation of the class. A property declared as static cannot be accessed with an instantiated class object (though a static method can).

For compatibility with PHP 4, if no visibility declaration is used, then the property or method will be treated as if it was declared as public.

Static methods

Because static methods are callable without an instance of the object created, the pseudo-variable $this is not available inside the method declared as static.

Caution

In PHP 5, calling non-static methods statically generates an E_STRICT level warning.

Warning

In PHP 7, calling non-static methods statically is deprecated, and will generate an E_DEPRECATED warning. Support for calling non-static methods statically may be removed in the future.

Example #1 Static method example

<?php
class Foo {
    public static function 
aStaticMethod() {
        
// ...
    
}
}

Foo::aStaticMethod();
$classname 'Foo';
$classname::aStaticMethod(); // As of PHP 5.3.0
?>

Static properties

Static properties cannot be accessed through the object using the arrow operator ->.

Like any other PHP static variable, static properties may only be initialized using a literal or constant before PHP 5.6; expressions are not allowed. In PHP 5.6 and later, the same rules apply as const expressions: some limited expressions are possible, provided they can be evaluated at compile time.

As of PHP 5.3.0, it's possible to reference the class using a variable. The variable's value cannot be a keyword (e.g. self, parent and static).

Example #2 Static property example

<?php
class Foo
{
    public static 
$my_static 'foo';

    public function 
staticValue() {
        return 
self::$my_static;
    }
}

class 
Bar extends Foo
{
    public function 
fooStatic() {
        return 
parent::$my_static;
    }
}


print 
Foo::$my_static "\n";

$foo = new Foo();
print 
$foo->staticValue() . "\n";
print 
$foo->my_static "\n";      // Undefined "Property" my_static 

print $foo::$my_static "\n";
$classname 'Foo';
print 
$classname::$my_static "\n"// As of PHP 5.3.0

print Bar::$my_static "\n";
$bar = new Bar();
print 
$bar->fooStatic() . "\n";
?>
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User Contributed Notes 46 notes

up
113
inkredibl
9 years ago
Note that you should read "Variables/Variable scope" if you are looking for static keyword use for declaring static variables inside functions (or methods). I myself had this gap in my PHP knowledge until recently and had to google to find this out. I think this page should have a "See also" link to static function variables.
http://www.php.net/manual/en/language.variables.scope.php
up
69
payal001 at gmail dot com
6 years ago
Here statically accessed property prefer property of the class for which it is called. Where as self keyword enforces use of current class only. Refer the below example:

<?php
class a{

static protected
$test="class a";

public function
static_test(){

echo static::
$test; // Results class b
echo self::$test; // Results class a

}

}

class
b extends a{

static protected
$test="class b";

}

$obj = new b();
$obj->static_test();
?>
up
22
webmaster at removethis dot weird-webdesign dot de
7 years ago
On PHP 5.2.x or previous you might run into problems initializing static variables in subclasses due to the lack of late static binding:

<?php
class A {
    protected static
$a;
   
    public static function
init($value) { self::$a = $value; }
    public static function
getA() { return self::$a; }
}

class
B extends A {
    protected static
$a; // redefine $a for own use
   
    // inherit the init() method
   
public static function getA() { return self::$a; }
}

B::init('lala');
echo
'A::$a = '.A::getA().'; B::$a = '.B::getA();
?>

This will output:
A::$a = lala; B::$a =

If the init() method looks the same for (almost) all subclasses there should be no need to implement init() in every subclass and by that producing redundant code.

Solution 1:
Turn everything into non-static. BUT: This would produce redundant data on every object of the class.

Solution 2:
Turn static $a on class A into an array, use classnames of subclasses as indeces. By doing so you also don't have to redefine $a for the subclasses and the superclass' $a can be private.

Short example on a DataRecord class without error checking:

<?php
abstract class DataRecord {
    private static
$db; // MySQLi-Connection, same for all subclasses
   
private static $table = array(); // Array of tables for subclasses
   
   
public static function init($classname, $table, $db = false) {
        if (!(
$db === false)) self::$db = $db;
       
self::$table[$classname] = $table;
    }
   
    public static function
getDB() { return self::$db; }
    public static function
getTable($classname) { return self::$table[$classname]; }
}

class
UserDataRecord extends DataRecord {
    public static function
fetchFromDB() {
       
$result = parent::getDB()->query('select * from '.parent::getTable('UserDataRecord').';');
       
       
// and so on ...
       
return $result; // An array of UserDataRecord objects
   
}
}

$db = new MySQLi(...);
UserDataRecord::init('UserDataRecord', 'users', $db);
$users = UserDataRecord::fetchFromDB();
?>

I hope this helps some people who need to operate on PHP 5.2.x servers for some reason. Late static binding, of course, makes this workaround obsolete.
up
12
davidn at xnet dot co dot nz
8 years ago
Static variables are shared between sub classes

<?php
class MyParent {
   
    protected static
$variable;
}

class
Child1 extends MyParent {
   
    function
set() {
       
       
self::$variable = 2;
    }
}

class
Child2 extends MyParent {
   
    function
show() {
       
        echo(
self::$variable);
    }
}

$c1 = new Child1();
$c1->set();
$c2 = new Child2();
$c2->show(); // prints 2
?>
up
11
ssj dot narutovash at gmail dot com
9 years ago
It's come to my attention that you cannot use a static member in an HEREDOC string.  The following code

class A
{
  public static $BLAH = "user";

  function __construct()
  {
    echo <<<EOD
<h1>Hello {self::$BLAH}</h1>
EOD;
  }
}

$blah = new A();

produces this in the source code:

<h1>Hello {self::}</h1>

Solution:

before using a static member, store it in a local variable, like so:

class B
{
  public static $BLAH = "user";

  function __construct()
  {
    $blah = self::$BLAH;
    echo <<<EOD
<h1>Hello {$blah}</h1>
EOD;
  }
}

and the output's source code will be:

<h1>Hello user</h1>
up
15
aidan at php dot net
12 years ago
To check if a function was called statically or not, you'll need to do:

<?php
function foo () {
   
$isStatic = !(isset($this) && get_class($this) == __CLASS__);
}
?>

More at (http://blog.phpdoc.info/archives/4-Schizophrenic-Methods.html).

(I'll add this to the manual soon).
up
3
valentin at balt dot name
7 years ago
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