Global space

(PHP 5 >= 5.3.0)

Without any namespace definition, all class and function definitions are placed into the global space - as it was in PHP before namespaces were supported. Prefixing a name with \ will specify that the name is required from the global space even in the context of the namespace.

Example #1 Using global space specification

<?php
namespace A\B\C;

/* This function is A\B\C\fopen */
function fopen() { 
     
/* ... */
     
$f = \fopen(...); // call global fopen
     
return $f;

?>

Коментарии

Автор:
Included files will default to the global namespace.
<?php
//test.php
namespace test {
  include 
'test1.inc';
  echo 
'-',__NAMESPACE__,'-<br />';
}
?>

<?php
//test1.inc
 
echo '-',__NAMESPACE__,'-<br />';
?>

Results of test.php:

--
-test-
2011-08-29 02:22:14
http://php5.kiev.ua/manual/ru/language.namespaces.global.html
In namespaced context the Exception class needs to be prefixed with global prefix operator.

<?php

namespace hey\ho\lets\go;

class 
MyClass
{
    public function 
failToCatch()
    {
        try {
           
$thing somethingThrowingAnException();
        } catch (
Exception $ex) {
             
// Not catched
       
}
    }

    public function 
succeedToCatch()
    {
        try {
           
$thing somethingThrowingAnException();
        } catch (
\Exception $ex) {
             
// This is now catched
       
}
    }

}
2015-05-15 10:59:58
http://php5.kiev.ua/manual/ru/language.namespaces.global.html
Note that variables aren't part of the namespace so they are always global (or scoped to function, etc.) and can't be accessed the same way as other namespace stuff.

So no:

    namespace Foo;
    $var = "hello";
    echo \Foo\$var;
2022-08-24 15:18:21
http://php5.kiev.ua/manual/ru/language.namespaces.global.html
To define an associative array (hash) so that it is part of the namespace, instead of going into the global namespace, just declare it as const, istead of as a variable.

This is handy for lookup tables, config settings, etc.

// Example.  Instead of writing:

$my_datatypes = [
    "sterility" =>  [
      "xlsx" => [
        "Sample Type",
        "Run Pass/Fail",
        "Result"
       ],
      "db" => [
        "SampleType",
        "RunPassFail",
        "Result"
       ]
    ]
];

// ...declare the lookup table like this:

const MY_DATATYPES = [
    "sterility" =>  [
      "xlsx" => [
        "Sample Type",
        "Run Pass/Fail",
        "Result"
       ],
      "db" => [
        "SampleType",
        "RunPassFail",
        "Result"
       ]
    ]
];

// ...and it will be declared within the current namespace.
2024-01-18 17:24:14
http://php5.kiev.ua/manual/ru/language.namespaces.global.html

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