<!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 null is allowed</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="class.reflectiontype.html">ReflectionType</a></div> <div class="next" style="text-align: right; float: right;"><a href="reflectiontype.isbuiltin.html">ReflectionType::isBuiltin</a></div> <div class="up"><a href="class.reflectiontype.html">ReflectionType</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="reflectiontype.allowsnull" class="refentry"> <div class="refnamediv"> <h1 class="refname">ReflectionType::allowsNull</h1> <p class="verinfo">(PHP 7)</p><p class="refpurpose"><span class="refname">ReflectionType::allowsNull</span> — <span class="dc-title">Checks if null is allowed</span></p> </div> <div class="refsect1 description" id="refsect1-reflectiontype.allowsnull-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>ReflectionType::allowsNull</strong></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> Checks whether the parameter allows <strong><code>NULL</code></strong>. </p> </div> <div class="refsect1 parameters" id="refsect1-reflectiontype.allowsnull-parameters"> <h3 class="title">Parameters</h3> <p class="para">This function has no parameters.</p> </div> <div class="refsect1 returnvalues" id="refsect1-reflectiontype.allowsnull-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <strong><code>TRUE</code></strong> if <strong><code>NULL</code></strong> is allowed, otherwise <strong><code>FALSE</code></strong> </p> </div> <div class="refsect1 examples" id="refsect1-reflectiontype.allowsnull-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-6473"> <p><strong>Example #1 <span class="methodname"><strong>ReflectionType::allowsNull()</strong></span> example</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">someFunction</span><span style="color: #007700">(</span><span style="color: #0000BB">string $param</span><span style="color: #007700">, </span><span style="color: #0000BB">StdClass $param2 </span><span style="color: #007700">= </span><span style="color: #0000BB">null</span><span style="color: #007700">) {}<br /><br /></span><span style="color: #0000BB">$reflectionFunc </span><span style="color: #007700">= new </span><span style="color: #0000BB">ReflectionFunction</span><span style="color: #007700">(</span><span style="color: #DD0000">'someFunction'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$reflectionParams </span><span style="color: #007700">= </span><span style="color: #0000BB">$reflectionFunc</span><span style="color: #007700">-></span><span style="color: #0000BB">getParameters</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$reflectionParams</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]-></span><span style="color: #0000BB">getType</span><span style="color: #007700">()-></span><span style="color: #0000BB">allowsNull</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$reflectionParams</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]-></span><span style="color: #0000BB">getType</span><span style="color: #007700">()-></span><span style="color: #0000BB">allowsNull</span><span style="color: #007700">());</span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> bool(false) bool(true) </pre></div> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-reflectiontype.allowsnull-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><span class="methodname"><a href="reflectiontype.isbuiltin.html" class="methodname" rel="rdfs-seeAlso">ReflectionType::isBuiltin()</a> - Checks if it is a built-in type</span></li> <li class="member"><span class="methodname"><a href="reflectiontype.tostring.html" class="methodname" rel="rdfs-seeAlso">ReflectionType::__toString()</a> - To string</span></li> <li class="member"><span class="methodname"><a href="reflectionparameter.gettype.html" class="methodname" rel="rdfs-seeAlso">ReflectionParameter::getType()</a> - Gets a parameter's type</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="class.reflectiontype.html">ReflectionType</a></div> <div class="next" style="text-align: right; float: right;"><a href="reflectiontype.isbuiltin.html">ReflectionType::isBuiltin</a></div> <div class="up"><a href="class.reflectiontype.html">ReflectionType</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>