Php namespace usage tutorial

The php namespace is introduced in the php Tutorial Module today. this is a new feature provided after php5.3, mainly to solve the naming conflict problem, use the namespace keyword to define php functions, variables, and classes in a namespace.

The php namespace is introduced in the php Tutorial Module today. this is a new feature provided after php5.3, mainly to solve the naming conflict problem, use the namespace keyword to define php functions, variables, and classes in a namespace. Note that no output is required before using namespace. Otherwise, the following error will be prompted:

(! ) Fatal error: Namespace declaration statement has to be the very first statement in the script in F: \ web \ zend \ exercise \ test. php on line3

The following php code: in the file. php file, a constant, a function, and a class are defined using namespace: (file1.php)

After defining a namespace, you must add the namespace name when using it. the following php code: (file2.php)

 ";echo MyProject\MyFunc()."
";echo MyProject\MyClass::MyMethod();?>

After the namespace is defined, different methods, variables, and classes can be used as long as they do not belong to the same namespace!

The namespace can have a multi-level mode, as shown below:

Namespace MyProject \ Sunname;

A php file can contain multiple namespaces, as shown in the following code: (file3.php)

In addition, you can also use the use keyword to import the namespace, as shown in the following php code:

 ";echo ns\MyFunc()."
";echo ns\MyClass::MyMethod();?>

Another idea is the _ NAMESPACE _ constant, which is used to return the name of the current NAMESPACE and may be useful during debugging! Welcome to view morePhp Tutorial