<!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>The ArrayAccess interface</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="iteratoraggregate.getiterator.html">IteratorAggregate::getIterator</a></div> <div class="next" style="text-align: right; float: right;"><a href="arrayaccess.offsetexists.html">ArrayAccess::offsetExists</a></div> <div class="up"><a href="reserved.interfaces.html">Predefined Interfaces and Classes</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="class.arrayaccess" class="reference"> <h1 class="title">The ArrayAccess interface</h1> <div class="partintro"><p class="verinfo">(PHP 5 >= 5.0.0)</p> <div class="section" id="arrayaccess.intro"> <h2 class="title">Introduction</h2> <p class="para"> Interface to provide accessing objects as arrays. </p> </div> <div class="section" id="arrayaccess.synopsis"> <h2 class="title">Interface synopsis</h2> <div class="classsynopsis"> <div class="ooclass"></div> <div class="classsynopsisinfo"> <span class="ooclass"> <strong class="classname">ArrayAccess</strong> </span> {</div> <div class="classsynopsisinfo classsynopsisinfo_comment">/* Methods */</div> <div class="methodsynopsis dc-description"> <span class="modifier">abstract</span> <span class="modifier">public</span> <span class="type">boolean</span> <span class="methodname"><a href="arrayaccess.offsetexists.html" class="methodname">offsetExists</a></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$offset</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">abstract</span> <span class="modifier">public</span> <span class="type">mixed</span> <span class="methodname"><a href="arrayaccess.offsetget.html" class="methodname">offsetGet</a></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$offset</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">abstract</span> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="arrayaccess.offsetset.html" class="methodname">offsetSet</a></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$offset</code></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$value</code></span> )</div> <div class="methodsynopsis dc-description"> <span class="modifier">abstract</span> <span class="modifier">public</span> <span class="type">void</span> <span class="methodname"><a href="arrayaccess.offsetunset.html" class="methodname">offsetUnset</a></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$offset</code></span> )</div> }</div> </div> <div class="section" id="arrayaccess.examples"> <div class="example" id="arrayaccess.example.basic"> <p><strong>Example #1 Basic usage</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">obj </span><span style="color: #007700">implements </span><span style="color: #0000BB">arrayaccess </span><span style="color: #007700">{<br /> private </span><span style="color: #0000BB">$container </span><span style="color: #007700">= array();<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">() {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">"one" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"two" </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"three" </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">,<br /> );<br /> }<br /> public function </span><span style="color: #0000BB">offsetSet</span><span style="color: #007700">(</span><span style="color: #0000BB">$offset</span><span style="color: #007700">, </span><span style="color: #0000BB">$value</span><span style="color: #007700">) {<br /> if (</span><span style="color: #0000BB">is_null</span><span style="color: #007700">(</span><span style="color: #0000BB">$offset</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container</span><span style="color: #007700">[] = </span><span style="color: #0000BB">$value</span><span style="color: #007700">;<br /> } else {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container</span><span style="color: #007700">[</span><span style="color: #0000BB">$offset</span><span style="color: #007700">] = </span><span style="color: #0000BB">$value</span><span style="color: #007700">;<br /> }<br /> }<br /> public function </span><span style="color: #0000BB">offsetExists</span><span style="color: #007700">(</span><span style="color: #0000BB">$offset</span><span style="color: #007700">) {<br /> return isset(</span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container</span><span style="color: #007700">[</span><span style="color: #0000BB">$offset</span><span style="color: #007700">]);<br /> }<br /> public function </span><span style="color: #0000BB">offsetUnset</span><span style="color: #007700">(</span><span style="color: #0000BB">$offset</span><span style="color: #007700">) {<br /> unset(</span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container</span><span style="color: #007700">[</span><span style="color: #0000BB">$offset</span><span style="color: #007700">]);<br /> }<br /> public function </span><span style="color: #0000BB">offsetGet</span><span style="color: #007700">(</span><span style="color: #0000BB">$offset</span><span style="color: #007700">) {<br /> return isset(</span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container</span><span style="color: #007700">[</span><span style="color: #0000BB">$offset</span><span style="color: #007700">]) ? </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">container</span><span style="color: #007700">[</span><span style="color: #0000BB">$offset</span><span style="color: #007700">] : </span><span style="color: #0000BB">null</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$obj </span><span style="color: #007700">= new </span><span style="color: #0000BB">obj</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(isset(</span><span style="color: #0000BB">$obj</span><span style="color: #007700">[</span><span style="color: #DD0000">"two"</span><span style="color: #007700">]));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$obj</span><span style="color: #007700">[</span><span style="color: #DD0000">"two"</span><span style="color: #007700">]);<br />unset(</span><span style="color: #0000BB">$obj</span><span style="color: #007700">[</span><span style="color: #DD0000">"two"</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(isset(</span><span style="color: #0000BB">$obj</span><span style="color: #007700">[</span><span style="color: #DD0000">"two"</span><span style="color: #007700">]));<br /></span><span style="color: #0000BB">$obj</span><span style="color: #007700">[</span><span style="color: #DD0000">"two"</span><span style="color: #007700">] = </span><span style="color: #DD0000">"A value"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$obj</span><span style="color: #007700">[</span><span style="color: #DD0000">"two"</span><span style="color: #007700">]);<br /></span><span style="color: #0000BB">$obj</span><span style="color: #007700">[] = </span><span style="color: #DD0000">'Append 1'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$obj</span><span style="color: #007700">[] = </span><span style="color: #DD0000">'Append 2'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$obj</span><span style="color: #007700">[] = </span><span style="color: #DD0000">'Append 3'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$obj</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> bool(true) int(2) bool(false) string(7) "A value" obj Object ( [container:obj:private] => Array ( [one] => 1 [three] => 3 [two] => A value [0] => Append 1 [1] => Append 2 [2] => Append 3 ) ) </pre></div> </div> </div> </div> </div> <h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="arrayaccess.offsetexists.html">ArrayAccess::offsetExists</a> — Whether a offset exists</li><li><a href="arrayaccess.offsetget.html">ArrayAccess::offsetGet</a> — Offset to retrieve</li><li><a href="arrayaccess.offsetset.html">ArrayAccess::offsetSet</a> — Offset to set</li><li><a href="arrayaccess.offsetunset.html">ArrayAccess::offsetUnset</a> — Offset to unset</li></ul> </div> <hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="iteratoraggregate.getiterator.html">IteratorAggregate::getIterator</a></div> <div class="next" style="text-align: right; float: right;"><a href="arrayaccess.offsetexists.html">ArrayAccess::offsetExists</a></div> <div class="up"><a href="reserved.interfaces.html">Predefined Interfaces and Classes</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>