Today we are going to learn about Namespace in PHP. \u00a0Let’s start with definition of namespace So “Namespace are basically a way of organising your PHP classes and preventing from any kind of code conflicts . See this example ,<\/p>\n
<?php \r\nnamespace Webkul;\r\n\r\n\/\/We have here a namespace with name Webkul and a class Name Opencart\r\n\r\nclass Opencart {\r\n\r\n\/\/Your all code will be here for this class\r\n\r\n}<\/pre>\nIn this example we have \u00a0created a \u00a0class called Opencart<\/em>\u00a0inside of the Webkul<\/em>\u00a0namespace. If we did not create namespace for class and \u00a0we have another\u00a0class with the \u00a0same name of ‘Opencart’ included in this file \u00a0we would get an error stating we cannot re-declare class. Namespace will allow us to create two class name with same name and we can include both in same file.So we can\u00a0create another class with same name \u00a0like this-<\/p>\n <\/p>\n
<?php\r\n\r\nnamespace Demo;\r\n\/\/We have here a namespace with name Demo\u00a0and a class Name Opencart \r\nclass Opencart {\r\n\/\/Your all code will be here for this class\r\n}<\/pre>\nHere we have created same class Opencart in another namespace Demo .Now we can include both file in our application and easily we can differentiate and use \u00a0both class Opencart from both namespace. As i have given a example how we can use both class in same file<\/p>\n
<?php\r\n\r\n\/\/ include both of our Opencart classes \r\nrequire \"Demo\/Opencart.php\";\r\nrequire \"Webkul\/Opencart.php\"; \r\n\r\n\/\/ create a new instance for Opencart in the Demo namespace\r\n $Opencart1 = new Demo\\Opencart(); \r\n \/\/ create a new instance for Opencart in the Webkul namespace \r\n $Opencart2 = new Webkul\\Opencart();<\/pre>\nBoth of these classes are different from each other and also \u00a0have different code , different\u00a0functionality . But here we are using both and namespace allow us to \u00a0use same class name and differentiate them by there namespaces. Also we can make these code more readable by using PHP use function.\u00a0For example, let’s say \u00a0we want to just use Opencart<\/em>\u00a0in place of \u00a0Demo\\Opencart<\/em>. Then by using PHP use function we can do like this<\/p>\n<?php\r\n\r\n require \"Demo\/Opencart.php\";\r\n require \"Webkul\/Opencart.php\"; \r\n\/\/ included both of our Opencart classes \r\n\r\nuse Demo\\Opencart as Opencart;\r\n\/\/this is to tell our code that i will use Opencart in place of Demo\/Opencart\r\n\r\n\/\/Now use of Opencart for Demo namespace\r\n $Opencart1 = new Opencart();<\/pre>\nWe have used use PHP function to tell our code that i want use Opencart in place of writing Demo\/Opencart. Now also we can use another namespace class for that \u00a0we have to do like this .<\/p>\n
\/\/This will change the Opencart class from demo to webkul namespace\r\n\r\nuse Webkul\\Opencart as Opencart;\r\n\/\/ Now if you will create a instance for opencart class\r\n$Opencart2 = new Opencart(); \r\n\r\n\/\/This is new intance of class Opencart from Webkul namespace\r\n<\/pre>\nNow if you will use Opencart class then you are using it form Webkul namespace . and you can create instance which will belongs to Opencart class from Webkul namespace. Thats all from this blog.<\/p>\n
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