PHP マニュアル
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# Visibility

The visibility of a member or method can be defined by prefixing the declaration with the keywords: public, protected or private. Public declared items can be allow access to any caller. Protected limits access access to only classes inherited. Protected limits visiblity only to the class that defines the item.

## Members Visibility

Class members must be defined with public, private, or private.

例 14-3. Member declaration

`<?php
class MyClass {
public $public = "MyClass::public!\n";
protected $protected = "MyClass::Protected!\n";
protected $protected2 = "MyClass::Protected2!\n";
private $private = "MyClass::private!\n";
function printHello() {
print "MyClass::printHello() " . $this->private;
print "MyClass::printHello() " . $this->protected;
print "MyClass::printHello() " . $this->protected2;
}
}
class MyClass2 extends MyClass {
protected $protected = "MyClass2::protected!\n";
function printHello() {
MyClass::printHello();
print "MyClass2::printHello() " . $this->public;
print "MyClass2::printHello() " . $this->protected;
print "MyClass2::printHello() " . $this->protected2;
/* Will result in a Fatal Error: */
//print "MyClass2::printHello() " . $this->private; /* Fatal Error */
}
}
$obj = new MyClass();
print "Main:: " . $obj->public;
//print $obj->private; /* Fatal Error */
//print $obj->protected; /* Fatal Error */
//print $obj->protected2; /* Fatal Error */
$obj->printHello(); /* Should print */
$obj2 = new MyClass2();
print "Main:: " . $obj2->private; /* Undefined */
//print $obj2->protected; /* Fatal Error */
//print $obj2->protected2; /* Fatal Error */
$obj2->printHello();
?>`

> 注意: The use PHP 4 use of declaring a variable with the keyword 'var' is no longer valid for PHP 5 objects. For compatiblity a variable declared in php will be assumed with public visiblity, and a E_STRICT warning will be issued.

## Method Visibility

.

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