What is a PHP namespace?

A namespace is a hierarchically labeled code block holding a regular PHP code. A namespace can contain valid PHP code. Namespace affects following types of code: classes (including abstracts and traits), interfaces, functions, and constants. Namespaces are declared using the namespace keyword.

How does PHP namespace work?

How PHP Namespaces Work. In short, a namespaces in PHP is placed at the top of a file, and designates that all the code in that file will be placed in a namespace. As we’ll go into in a bit more detail, this namespaces affects classes, interfaces, functions, and constants. It does no affect variables.

What is the best approach for working with classes and namespaces in PHP?

To address this problem, namespaces were introduced in PHP as of PHP 5.3. The best way to understand namespaces is by analogy to the directory structure concept in a filesystem. The directory which is used to group related files serves the purpose of a namespace.

How are namespaces declared in a PHP file?

Namespaces can be used to organize the classes into two different groups while also preventing the two classes Table and Table from being mixed up. Namespaces are declared at the beginning of a file using the namespace keyword: Declare a namespace called Html: Note: A namespace declaration must be the first thing in the PHP file.

What is the namespace keyword and constant in PHP?

PHP supports two ways of abstractly accessing elements within the current namespace, the __NAMESPACE__ magic constant, and the namespace keyword. The value of __NAMESPACE__ is a string that contains the current namespace name. In global, un-namespaced code, it contains an empty string. Example #1 __NAMESPACE__ example, namespaced code

Can you use multiple namespaces in the same PHP file?

It is strongly discouraged as a coding practice to combine multiple namespaces into the same file. The primary use case is to combine multiple PHP scripts into the same file. To combine global non-namespaced code with namespaced code, only bracketed syntax is supported.

How to combine Global Code with namespaces in PHP?

To combine global non-namespaced code with namespaced code, only bracketed syntax is supported. Global code should be encased in a namespace statement with no namespace name as in: class Connection { /*