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-
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
Sin ninguna definición de espacio de nombres, todas las clases y las funciones
se colocan en el espacio de nombres global: como en PHP antes de que los espacios
de nombres fueran introducidos. Al prefijar un nombre con un antislash
\, se puede solicitar el uso del espacio de nombres
global, incluso en un contexto de espacio de nombres específico.
Ejemplo #1 Especificación de espacio de nombres global
<?php
namespace A\B\C;
/* Esta función es A\B\C\fopen */
function fopen() {
/* ... */
$f = \fopen(...); // llamada a fopen global
return $f;
}
?>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-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;In namespaced context the Exception class needs to be prefixed with global prefix operator.<?phpnamespace 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 $ex) { // This is now catched } }}To define an associative array (hash) so that it is part of the namespace, instead of going into the global namespace, just declare it as const, istead of as a variable.This is handy for lookup tables, config settings, etc.// Example. Instead of writing:$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.