PHP Conference Japan 2024

Espace de noms global

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

Sans aucune définition d'espace de noms, toutes les classes et les fonctions sont placées dans l'espace de noms global : comme en PHP avant que les espaces de noms aient été introduits. En préfixant un nom avec un antislash \, on peut demander l'utilisation de l'espace de noms global, même dans un contexte d'espace de noms spécifique.

Exemple #1 Spécification d'espace de noms global

<?php
namespace A\B\C;

/* Cette fonction est A\B\C\fopen */
function fopen() {
/* ... */
$f = \fopen(...); // appel à fopen global
return $f;
}
?>

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User Contributed Notes 4 notes

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61
routinet
13 years ago
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-
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3
PhoneixSegovia at gmail dot com
2 years ago
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;
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16
nobody at example dot com
9 years ago
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
}
}

}
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1
dmc60 at cam dot ac dot uk
10 months ago
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.
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