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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Objects</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.types.array.html">Arrays</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.types.resource.html">Resources</a></div> <div class="up"><a href="language.types.html">Types</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="language.types.object" class="sect1"> <h2 class="title">Objects</h2> <div id="language.types.object.init" class="sect2"> <h3 class="title">Object Initialization</h3> <p class="para"> To create a new <a href="language.types.object.html" class="type object">object</a>, use the <i>new</i> statement to instantiate a class: </p> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">foo<br /></span><span style="color: #007700">{<br /> function </span><span style="color: #0000BB">do_foo</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"Doing foo."</span><span style="color: #007700">; <br /> }<br />}<br /><br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= new </span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$bar</span><span style="color: #007700">-></span><span style="color: #0000BB">do_foo</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <p class="simpara"> For a full discussion, see the <a href="language.oop.html" class="link">Classes and Objects</a> chapter. </p> </div> <div id="language.types.object.casting" class="sect2"> <h3 class="title">Converting to object</h3> <p class="para"> If an <a href="language.types.object.html" class="type object">object</a> is converted to an <a href="language.types.object.html" class="type object">object</a>, it is not modified. If a value of any other type is converted to an <a href="language.types.object.html" class="type object">object</a>, a new instance of the <i>stdClass</i> built-in class is created. If the value was <b><tt>NULL</tt></b>, the new instance will be empty. <a href="language.types.array.html" class="type Array">Array</a>s convert to an <a href="language.types.object.html" class="type object">object</a> with properties named by keys, and corresponding values. For any other value, a member variable named <i>scalar</i> will contain the value. </p> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$obj </span><span style="color: #007700">= (object) </span><span style="color: #DD0000">'ciao'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">$obj</span><span style="color: #007700">-></span><span style="color: #0000BB">scalar</span><span style="color: #007700">; </span><span style="color: #FF8000">// outputs 'ciao'<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.types.array.html">Arrays</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.types.resource.html">Resources</a></div> <div class="up"><a href="language.types.html">Types</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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