domdocument.getelementbyid.html
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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>Searches for an element with a certain id</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="domdocument.createtextnode.html">DOMDocument::createTextNode</a></div> <div class="next" style="text-align: right; float: right;"><a href="domdocument.getelementsbytagname.html">DOMDocument::getElementsByTagName</a></div> <div class="up"><a href="class.domdocument.html">DOMDocument</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="domdocument.getelementbyid" class="refentry"> <div class="refnamediv"> <h1 class="refname">DOMDocument::getElementById</h1> <p class="verinfo">(No version information available, might be only in CVS)</p><p class="refpurpose"><span class="refname">DOMDocument::getElementById</span> — <span class="dc-title">Searches for an element with a certain id</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><a href="class.domelement.html" class="type DOMElement">DOMElement</a></span> <span class="methodname"><b><b>DOMDocument::getElementById</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$elementId</tt></span> )</div> <p class="para rdfs-comment"> This function is similar to <a href="domdocument.getelementsbytagname.html" class="xref">DOMDocument::getElementsByTagName</a> but searches for an element with a given id. </p> <p class="para"> For this function to work, you will need either to set some ID attributes with <a href="domelement.setidattribute.html" class="xref">DOMElement::setIdAttribute</a> or a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document with <a href="domdocument.validate.html" class="xref">DOMDocument::validate</a> or <i>DOMDocument->validateOnParse</i> before using this function. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">elementId</tt></i></span> <dd> <p class="para"> The unique id value for an element. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the <a href="class.domelement.html" class="classname">DOMElement</a> or <b><tt>NULL</tt></b> if the element is not found. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <div class="example"> <p><b>Example #1 DOMDocument->getElementById() Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />$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 />echo </span><span style="color: #DD0000">"The element whose id is books is: " </span><span style="color: #007700">. </span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">getElementById</span><span style="color: #007700">(</span><span style="color: #DD0000">'books'</span><span style="color: #007700">)-></span><span style="color: #0000BB">tagName </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>The element whose id is books is: chapter</pre></div> </pre></div> </div> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="domdocument.getelementsbytagname.html" class="xref">DOMDocument::getElementsByTagName</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="domdocument.createtextnode.html">DOMDocument::createTextNode</a></div> <div class="next" style="text-align: right; float: right;"><a href="domdocument.getelementsbytagname.html">DOMDocument::getElementsByTagName</a></div> <div class="up"><a href="class.domdocument.html">DOMDocument</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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