<!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>Checks if the function has a specified return type</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="reflectionfunctionabstract.getstaticvariables.html">ReflectionFunctionAbstract::getStaticVariables</a></div>
<div class="next" style="text-align: right; float: right;"><a href="reflectionfunctionabstract.innamespace.html">ReflectionFunctionAbstract::inNamespace</a></div>
<div class="up"><a href="class.reflectionfunctionabstract.html">ReflectionFunctionAbstract</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="reflectionfunctionabstract.hasreturntype" class="refentry">
<div class="refnamediv">
<h1 class="refname">ReflectionFunctionAbstract::hasReturnType</h1>
<p class="verinfo">(PHP 7)</p><p class="refpurpose"><span class="refname">ReflectionFunctionAbstract::hasReturnType</span> — <span class="dc-title">Checks if the function has a specified return type</span></p>
</div>
<div class="refsect1 description" id="refsect1-reflectionfunctionabstract.hasreturntype-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>ReflectionFunctionAbstract::hasReturnType</strong></span>
( <span class="methodparam">void</span>
)</div>
<p class="para rdfs-comment">
Checks whether the reflected function has a return type specified.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-reflectionfunctionabstract.hasreturntype-parameters">
<h3 class="title">Parameters</h3>
<p class="para">This function has no parameters.</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-reflectionfunctionabstract.hasreturntype-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> if the function is a specified return type, otherwise <strong><code>FALSE</code></strong>.
</p>
</div>
<div class="refsect1 examples" id="refsect1-reflectionfunctionabstract.hasreturntype-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-6448">
<p><strong>Example #1 <span class="methodname"><strong>ReflectionFunctionAbstract::hasReturnType()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">function </span><span style="color: #0000BB">to_int</span><span style="color: #007700">(</span><span style="color: #0000BB">$param</span><span style="color: #007700">) : </span><span style="color: #0000BB">int </span><span style="color: #007700">{<br /> return (int) </span><span style="color: #0000BB">$param</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$reflection1 </span><span style="color: #007700">= new </span><span style="color: #0000BB">ReflectionFunction</span><span style="color: #007700">(</span><span style="color: #DD0000">'to_int'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$reflection1</span><span style="color: #007700">-></span><span style="color: #0000BB">hasReturnType</span><span style="color: #007700">());</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>
bool(true)
</pre></div>
</div>
</div>
<div class="example" id="example-6449">
<p><strong>Example #2 Usage on built-in functions</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />$reflection2 </span><span style="color: #007700">= new </span><span style="color: #0000BB">ReflectionFunction</span><span style="color: #007700">(</span><span style="color: #DD0000">'array_merge'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$reflection2</span><span style="color: #007700">-></span><span style="color: #0000BB">hasReturnType</span><span style="color: #007700">());</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>
bool(false)
</pre></div>
</div>
</div>
</p>
<p class="para">
This is because many internal functions do not have types specified for their
parameters or return values. It is therefore best to avoid using this
method on built-in functions.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-reflectionfunctionabstract.hasreturntype-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="methodname"><a href="reflectionfunctionabstract.getreturntype.html" class="methodname" rel="rdfs-seeAlso">ReflectionFunctionAbstract::getReturnType()</a> - Gets the specified return type of a function</span></li>
</ul>
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="reflectionfunctionabstract.getstaticvariables.html">ReflectionFunctionAbstract::getStaticVariables</a></div>
<div class="next" style="text-align: right; float: right;"><a href="reflectionfunctionabstract.innamespace.html">ReflectionFunctionAbstract::inNamespace</a></div>
<div class="up"><a href="class.reflectionfunctionabstract.html">ReflectionFunctionAbstract</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
