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<title>Checks if attribute is a defined ID</title>
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<h1 class="refname">DOMAttr::isId</h1>
<p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">DOMAttr::isId</span> — <span class="dc-title">
Checks if attribute is a defined ID
</span></p>
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<div class="refsect1 description" id="refsect1-domattr.isid-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">bool</span> <span class="methodname"><strong>DOMAttr::isId</strong></span>
( <span class="methodparam">void</span>
)</div>
<p class="para rdfs-comment">
This function checks if the attribute is a defined ID.
</p>
<p class="para">
According to the DOM standard this requires a DTD which defines the
attribute ID to be of type ID. You need to validate your document with
<a href="domdocument.validate.html" class="xref">DOMDocument::validate</a>
or <em>DOMDocument::validateOnParse</em> before using this function.
</p>
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<div class="refsect1 returnvalues" id="refsect1-domattr.isid-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
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<div class="refsect1 examples" id="refsect1-domattr.isid-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-5395">
<p><strong>Example #1 DOMAttr::isId() Example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />$doc </span><span style="color: #007700">= new </span><span style="color: #0000BB">DomDocument</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// We need to validate our document before refering to the id<br /></span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">validateOnParse </span><span style="color: #007700">= </span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">Load</span><span style="color: #007700">(</span><span style="color: #DD0000">'book.xml'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// We retrieve the attribute named id of the chapter element<br /></span><span style="color: #0000BB">$attr </span><span style="color: #007700">= </span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">getElementsByTagName</span><span style="color: #007700">(</span><span style="color: #DD0000">'chapter'</span><span style="color: #007700">)-></span><span style="color: #0000BB">item</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">)-></span><span style="color: #0000BB">getAttributeNode</span><span style="color: #007700">(</span><span style="color: #DD0000">'id'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$attr</span><span style="color: #007700">-></span><span style="color: #0000BB">isId</span><span style="color: #007700">()); </span><span style="color: #FF8000">// bool(true)<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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