PHP: Global space

Using namespaces: fallback to global function/constant

Last updated: Fri, 20 Nov 2009

Global space

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;
} 
?>

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Using namespaces: fallback to global function/constant

Using namespaces: Aliasing/Importing

Last updated: Fri, 20 Nov 2009