<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Declaring sub-namespaces</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.namespaces.definition.html">Defining namespaces</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.namespaces.definitionmultiple.html">Defining multiple namespaces in the same file</a></div> <div class="up"><a href="language.namespaces.html">Namespaces</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="language.namespaces.nested" class="sect1"> <h2 class="title">Declaring sub-namespaces</h2> <p class="verinfo">(PHP 5 >= 5.3.0)</p> <p class="para"> Much like directories and files, PHP namespaces also contain the ability to specify a hierarchy of namespace names. Thus, a namespace name can be defined with sub-levels: <div class="example" id="example-236"> <p><strong>Example #1 Declaring a single namespace with hierarchy</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">namespace </span><span style="color: #0000BB">MyProject</span><span style="color: #007700">\</span><span style="color: #0000BB">Sub</span><span style="color: #007700">\</span><span style="color: #0000BB">Level</span><span style="color: #007700">;<br /><br />const </span><span style="color: #0000BB">CONNECT_OK </span><span style="color: #007700">= </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />class </span><span style="color: #0000BB">Connection </span><span style="color: #007700">{ </span><span style="color: #FF8000">/* ... */ </span><span style="color: #007700">}<br />function </span><span style="color: #0000BB">connect</span><span style="color: #007700">() { </span><span style="color: #FF8000">/* ... */ </span><span style="color: #007700">}<br /><br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> The above example creates constant <em>MyProject\Sub\Level\CONNECT_OK</em>, class <em>MyProject\Sub\Level\Connection</em> and function <em>MyProject\Sub\Level\connect</em>. </p> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.namespaces.definition.html">Defining namespaces</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.namespaces.definitionmultiple.html">Defining multiple namespaces in the same file</a></div> <div class="up"><a href="language.namespaces.html">Namespaces</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>