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<div id="domdocument.prepend" class="refentry">
<div class="refnamediv">
<h1 class="refname">DOMDocument::prepend</h1>
<p class="verinfo">(PHP 8)</p><p class="refpurpose"><span class="refname">DOMDocument::prepend</span> — <span class="dc-title">Prepends nodes before the first child node</span></p>
</div>
<div class="refsect1 description" id="refsect1-domdocument.prepend-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><strong>DOMDocument::prepend</strong></span>(<span class="methodparam"><span class="type"><span class="type"><a href="class.domnode.php" class="type DOMNode">DOMNode</a></span>|<span class="type"><a href="language.types.string.php" class="type string">string</a></span></span> <code class="parameter">...$nodes</code></span>): <span class="type"><a href="language.types.void.php" class="type void">void</a></span></div>
<p class="para rdfs-comment">
Prepends one or many <code class="parameter">nodes</code> to the list of children before the first child node.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-domdocument.prepend-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl>
<dt><code class="parameter">nodes</code></dt>
<dd>
<p class="para">
The nodes to prepend.
Strings are automatically converted to text nodes.
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-domdocument.prepend-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
没有返回值。
</p>
</div>
<div class="refsect1 errors" id="refsect1-domdocument.prepend-errors">
<h3 class="title">错误／异常</h3>
<dl>
<dt><strong><code><a href="dom.constants.php#constant.dom-hierarchy-request-err">DOM_HIERARCHY_REQUEST_ERR</a></code></strong></dt>
<dd>
<p class="para">
Raised if this node is of a type that does not allow children of the
type of one of the passed <code class="parameter">nodes</code>, or if the node to
put in is one of this node's ancestors or this node itself.
</p>
</dd>
<dt><strong><code><a href="dom.constants.php#constant.dom-wrong-document-err">DOM_WRONG_DOCUMENT_ERR</a></code></strong></dt>
<dd>
<p class="para">
Raised if one of the passed <code class="parameter">nodes</code> was created from a different
document than the one that created this node.
</p>
</dd>
</dl>
</div>
<div class="refsect1 changelog" id="refsect1-domdocument.prepend-changelog">
<h3 class="title">更新日志</h3>
<table class="doctable informaltable">
<thead>
<tr>
<th>版本</th>
<th>说明</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>8.3.0</td>
<td>
Calling this method on a node without an owner document now works.
Previously this threw a
<span class="classname"><a href="class.domexception.php" class="classname">DOMException</a></span> with code
<strong><code><a href="dom.constants.php#constant.dom-hierarchy-request-err">DOM_HIERARCHY_REQUEST_ERR</a></code></strong>.
</td>
</tr>
</tbody>
</table>
</div>
<div class="refsect1 examples" id="refsect1-domdocument.prepend-examples">
<h3 class="title">示例</h3>
<div class="example" id="domdocument.prepend.example.basic">
<p><strong>示例 #1 <span class="methodname"><strong>DOMDocument::prepend()</strong></span> example</strong></p>
<div class="example-contents"><p>
Adds nodes before the document root.
</p></div>
<div class="example-contents">
<div class="annotation-interactive phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$doc </span><span style="color: #007700">= new </span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">loadXML</span><span style="color: #007700">(</span><span style="color: #DD0000">"<world/>"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">prepend</span><span style="color: #007700">(</span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">createElement</span><span style="color: #007700">(</span><span style="color: #DD0000">"hello"</span><span style="color: #007700">), </span><span style="color: #DD0000">"beautiful"</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">$doc</span><span style="color: #007700">-></span><span style="color: #0000BB">saveXML</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div>
</div>
<div class="example-contents"><p>以上示例会输出：</p></div>
<div class="example-contents screen">
<div class="annotation-interactive examplescode"><pre class="examplescode"><?xml version="1.0"?>
<hello/>
beautiful
<world/></pre>
</div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-domdocument.prepend-seealso">
<h3 class="title">参见</h3>
<ul class="simplelist">
<li><span class="methodname"><a href="domparentnode.prepend.php" class="methodname" rel="rdfs-seeAlso">DOMParentNode::prepend()</a> - Prepends nodes before the first child node</span></li>
<li><span class="methodname"><a href="domdocument.append.php" class="methodname" rel="rdfs-seeAlso">DOMDocument::append()</a> - Appends nodes after the last child node</span></li>
</ul>
</div>
</div><?php manual_footer($setup); ?>