Defining multiple namespaces in the same file

(PHP 5 >= 5.3.0, PHP 7)

Examples:

Declaring multiple namespaces, simple combination syntax

Multiple namespaces may also be declared in the same file. There are two allowed syntaxes.

<?php
namespace MyProject;
 
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */  }
 
namespace AnotherProject;
 
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */  }
?>

Declaring multiple namespaces, bracketed syntax

This syntax is not recommended for combining namespaces into a single file. Instead it is recommended to use the alternate bracketed syntax.

<?php
namespace MyProject {
 
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */  }
}
 
namespace AnotherProject {
 
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */  }
}
?>

Declaring multiple namespaces and unnamespaced code

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. Global code should be encased in a namespace statement with no namespace name as in:

<?php
namespace MyProject {
 
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */  }
}
 
namespace { // global code
session_start();
$a = MyProject\connect();
echo MyProject\Connection::start();
}
?>

Declaring multiple namespaces and unnamespaced code

No PHP code may exist outside of the namespace brackets except for an opening declare statement.

<?php
declare(encoding='UTF-8');
namespace MyProject {
 
const CONNECT_OK = 1;
class Connection { /* ... */ }
function connect() { /* ... */  }
}
 
namespace { // global code
session_start();
$a = MyProject\connect();
echo MyProject\Connection::start();
}
?>

Links:

http://php.net/manual/en/language.namespaces.definitionmultiple.php

doc_php

2025-01-10 15:47:30

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