<!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>Throw an exception into the generator</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="generator.send.html">Generator::send</a></div>
<div class="next" style="text-align: right; float: right;"><a href="generator.valid.html">Generator::valid</a></div>
<div class="up"><a href="class.generator.html">Generator</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="generator.throw" class="refentry">
<div class="refnamediv">
<h1 class="refname">Generator::throw</h1>
<p class="verinfo">(PHP 5 >= 5.5.0, PHP 7)</p><p class="refpurpose"><span class="refname">Generator::throw</span> — <span class="dc-title">Throw an exception into the generator</span></p>
</div>
<div class="refsect1 description" id="refsect1-generator.throw-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><strong>Generator::throw</strong></span>
( <span class="methodparam"><span class="type"><a href="class.throwable.html" class="type Throwable">Throwable</a></span> <code class="parameter">$exception</code></span>
)</div>
<p class="para rdfs-comment">
Throws an exception into the generator and resumes execution of the generator.
The behavior will be the same as if the current <a href="language.generators.syntax.html#control-structures.yield" class="link">yield</a> expression was replaced with
a <em>throw $exception</em> statement.
</p>
<p class="para">
If the generator is already closed when this method is invoked, the exception will
be thrown in the caller's context instead.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-generator.throw-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<code class="parameter">exception</code></dt>
<dd>
<p class="para">
Exception to throw into the generator.
</p>
</dd>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-generator.throw-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the yielded value.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-generator.throw-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>7.0.0</td>
<td>
The <code class="parameter">exception</code> parameter also accepts <a href="class.throwable.html" class="classname">Throwable</a> now.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-generator.throw-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-334">
<p><strong>Example #1 Throwing an exception into a generator</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">function </span><span style="color: #0000BB">gen</span><span style="color: #007700">() {<br /> echo </span><span style="color: #DD0000">"Foo\n"</span><span style="color: #007700">;<br /> try {<br /> </span><span style="color: #0000BB">yield</span><span style="color: #007700">;<br /> } catch (</span><span style="color: #0000BB">Exception $e</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Exception: </span><span style="color: #007700">{</span><span style="color: #0000BB">$e</span><span style="color: #007700">-></span><span style="color: #0000BB">getMessage</span><span style="color: #007700">()}</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br /> }<br /> echo </span><span style="color: #DD0000">"Bar\n"</span><span style="color: #007700">;<br />}<br /> <br /></span><span style="color: #0000BB">$gen </span><span style="color: #007700">= </span><span style="color: #0000BB">gen</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$gen</span><span style="color: #007700">-></span><span style="color: #0000BB">rewind</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$gen</span><span style="color: #007700">-></span><span style="color: #0000BB">throw</span><span style="color: #007700">(new </span><span style="color: #0000BB">Exception</span><span style="color: #007700">(</span><span style="color: #DD0000">'Test'</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:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Foo
Exception: Test
Bar
</pre></div>
</div>
</div>
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="generator.send.html">Generator::send</a></div>
<div class="next" style="text-align: right; float: right;"><a href="generator.valid.html">Generator::valid</a></div>
<div class="up"><a href="class.generator.html">Generator</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
