{"id":952,"date":"2017-03-20T10:45:22","date_gmt":"2017-03-20T05:15:22","guid":{"rendered":"https:\/\/www.wikitechy.com\/technology\/?p=952"},"modified":"2017-03-29T12:50:56","modified_gmt":"2017-03-29T07:20:56","slug":"difference-public-private-protected","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/technology\/difference-public-private-protected\/","title":{"rendered":"PHP-What is the difference between public, private, and protected"},"content":{"rendered":"

Available Visibility in PHP Classes<\/p>\n

There are 3 type of visibility available in php for controlling your property or method.<\/p>\n

Public:<\/strong><\/span><\/p>\n

Public method or variable can be accessible from anywhere. I mean from inside the class, out side the class and in child class also.<\/p>\n

Private: <\/strong><\/span><\/p>\n

Method or property with private visibility can only be accessible inside the class. You can not access private method or variable from outside of your class.<\/p>\n

Protected: <\/strong><\/span><\/p>\n

Method or variable with protected visibility can only be access in the derived class. Or in other word in child class. Protected will be used in the process of inheritance.<\/p>\n

\"\"<\/p>\n

Public:<\/strong><\/span><\/p>\n

Public visiblity is least restricted visibility available in php.<\/p>\n

If you will not define the visibity factor with your method or property then public will be by defautl applied.<\/p>\n

Public methods or variables can be accessible from anywhere<\/p>\n

.For example,<\/strong> \u00a0It can be accessible from using object(outside the class), or inside the class, or in child class.<\/p>\n

Php Code<\/span> <\/div> 
class test{public $abc;public $xyz;public function xyz(){}}$objA = new test();echo $objA->abc;\/\/accessible from outside$objA->xyz();\/\/public method of the class test<\/code><\/pre> <\/div>\n[ad type=”banner”]\n
Private:<\/strong><\/span><\/p>\n
Private method or properties can only be accessible within the class.<\/p>\n
You can not access private variable or function of the class by making object out side the class.<\/p>\n
But you can use private function and property within the class using $this object.<\/p>\n
Private\u00a0visibility\u00a0in php classes is used when you do not want your property or function to be exposed outside the class.<\/p>\n
example of Private visibility in php classes.<\/p>\n
 
 Php Code<\/span> <\/div> 
Class test{public $abc;private $xyz;public function pubDo($a){echo $a;}private function privDo($b){echo $b;}public function pubPrivDo(){$this->xyz = 1;$this->privDo(1);}}$objT = new test();$objT->abc = 3;\/\/Works fine$objT->xyz = 1;\/\/Throw fatal error of visibility$objT->pubDo("test");\/\/Print "test"$objT->privDo(1);\/\/Fatal error of visibility$objT->pubPrivDo();\/\/Within this method private function privDo and variable xyz is called using $this variable.<\/code><\/pre> <\/div>\n
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Protected:<\/strong><\/span><\/p>\n
Protected visibility in php\u00a0classes\u00a0are only useful in case of\u00a0inheritance\u00a0and interface.<\/p>\n
We will discuss in depth of interfaces and\u00a0inheritance\u00a0in other chapter of this tutorial.<\/p>\n
Protected method or variable can be accessible either within class or child class. Here we will take very basic example:<\/p>\n
 
 Php Code<\/span> <\/div> 
class parent{protected $pr;public $aprotected function testParent(){echo this is test;}}class child extends parent{public function testChild(){$this->testParent(); \/\/will work because it}}$objParent = new parent();$objParent->testParent();\/\/Throw error$objChild = new Child();$objChild->setChild();\/\/work because test child will call test parent.<\/code><\/pre> <\/div>\n
If you will take analyze above section you can found that method test Parent() is not accessible from object of class. But it is accessible in child class.<\/p>\n","protected":false},"excerpt":{"rendered":"
Available Visibility in PHP Classes There are 3 type of visibility available in php for controlling your property or method. Public: Public method or variable can be accessible from anywhere. I mean from inside the class, out side the class and in child class also. Private: Method or property with private visibility can only be […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[1795,1797,1796,1792,1799,1794,1798,1793],"class_list":["post-952","post","type-post","status-publish","format-standard","hentry","category-php","tag-php-default-visibility","tag-php-private-class","tag-php-protected-static","tag-php-protected-variable","tag-php-public-variable","tag-protected-function-c","tag-public-private-protected-c","tag-public-private-protected-in-php-examples"],"_links":{"self":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/posts\/952","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/comments?post=952"}],"version-history":[{"count":0,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/posts\/952\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/media?parent=952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/categories?post=952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wikitechy.com\/technology\/wp-json\/wp\/v2\/tags?post=952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}