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<title>Create a new ReadConcern</title>
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<h1 class="refname">MongoDB\Driver\ReadConcern::__construct</h1>
<p class="verinfo">(mongodb >=1.0.0)</p><p class="refpurpose"><span class="refname">MongoDB\Driver\ReadConcern::__construct</span> — <span class="dc-title">Create a new ReadConcern</span></p>
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<div class="refsect1 description" id="refsect1-mongodb-driver-readconcern.construct-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span> <span class="modifier">public</span> <span class="methodname"><strong>MongoDB\Driver\ReadConcern::__construct</strong></span>
([ <span class="methodparam"><span class="type">string</span> <code class="parameter">$level</code></span>
] )</div>
<p class="para rdfs-comment">
Constructs a new <a href="class.mongodb-driver-readconcern.html" class="classname">MongoDB\Driver\ReadConcern</a>, which is
an immutable value object.
</p>
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<div class="refsect1 parameters" id="refsect1-mongodb-driver-readconcern.construct-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<code class="parameter">level</code></dt>
<dd>
<p class="para">
The <a href="https://docs.mongodb.com/manual/reference/read-concern/#read-concern-levels" class="link external">» read concern level</a>.
You may use, but are not limited to, one of the
<a href="class.mongodb-driver-readconcern.html#mongodb-driver-readconcern.constants" class="link">class constants</a>.
</p>
</dd>
</dl>
</div>
<div class="refsect1 errors" id="refsect1-mongodb-driver-readconcern.construct-errors">
<h3 class="title">Errors/Exceptions</h3>
<ul class="simplelist">
<li class="member">Throws <a href="class.mongodb-driver-exception-invalidargumentexception.html" class="classname">MongoDB\Driver\Exception\InvalidArgumentException</a> on argument parsing errors.</li>
</ul>
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<div class="refsect1 examples" id="refsect1-mongodb-driver-readconcern.construct-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-1719">
<p><strong>Example #1 <span class="function"><strong>MongoDB\Driver\ReadConcern::__construct()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">/* Unspecified read isolation level (uses the server's default behavior) */<br /></span><span style="color: #0000BB">$rc </span><span style="color: #007700">= new </span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/* Request read isolation from a single replica set node */<br /></span><span style="color: #0000BB">$rc </span><span style="color: #007700">= new </span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">(</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">::</span><span style="color: #0000BB">LOCAL</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Request read isolation from a majority of the replica set nodes */<br /></span><span style="color: #0000BB">$rc </span><span style="color: #007700">= new </span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">(</span><span style="color: #0000BB">MongoDB</span><span style="color: #007700">\</span><span style="color: #0000BB">Driver</span><span style="color: #007700">\</span><span style="color: #0000BB">ReadConcern</span><span style="color: #007700">::</span><span style="color: #0000BB">MAJORITY</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-mongodb-driver-readconcern.construct-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"><a href="https://docs.mongodb.com/manual/reference/read-concern/" class="link external">» Read Concern reference</a></li>
</ul>
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