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<h1 class="refname">MongoCollection::deleteIndex</h1>
<p class="verinfo">(PECL mongo >=0.9.0)</p><p class="refpurpose"><span class="refname">MongoCollection::deleteIndex</span> — <span class="dc-title">Deletes an index from this collection</span></p>
</div>
<div class="refsect1 description" id="refsect1-mongocollection.deleteindex-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">array</span> <span class="methodname"><strong>MongoCollection::deleteIndex</strong></span>
( <span class="methodparam"><span class="type"><span class="type string|array">string|array</span></span> <code class="parameter">$keys</code></span>
)</div>
<p class="para rdfs-comment">
This method is identical to:
</p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">public function </span><span style="color: #0000BB">deleteIndexes</span><span style="color: #007700">(</span><span style="color: #0000BB">$keys</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// toIndexString is a protected method that turns strings, arrays, and objs <br /> //into index names<br /> </span><span style="color: #0000BB">$index </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">toIndexString</span><span style="color: #007700">(</span><span style="color: #0000BB">$keys</span><span style="color: #007700">);<br /><br /> return </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">db</span><span style="color: #007700">-></span><span style="color: #0000BB">command</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"deleteIndexes" </span><span style="color: #007700">=> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">getName</span><span style="color: #007700">(), <br /> </span><span style="color: #DD0000">"index" </span><span style="color: #007700">=> </span><span style="color: #0000BB">$index</span><span style="color: #007700">));<br />}<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<p class="para">
Each index, when created, is given a unique name. This is generally user-set
(with <span class="function"><a href="mongocollection.ensureindex.html" class="function">MongoCollection::ensureIndex()</a></span>'s "name" option) or
generated by the driver from a combination of key names and directions. This
name is then used by <span class="function"><strong>MongoCollection::deleteIndex()</strong></span> to
remove the function.
</p>
<p class="para">
Unfortunately, the <span class="function"><a href="mongocollection.ensureindex.html" class="function">MongoCollection::ensureIndex()</a></span>
generates slightly different names than the shell and, due to backwards
compatibility issues, <span class="function"><strong>MongoCollection::deleteIndex()</strong></span>
cannot delete custom-named indexes as well. Thus, the best way to delete
indexes created in the shell or with custom names is to directly call the
<em>deleteIndexes</em> database command.
</p>
<p class="para">
Thus, if you named an index "superfast query", you could only delete it
with the PHP driver by running:
</p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />$db</span><span style="color: #007700">-></span><span style="color: #0000BB">command</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"deleteIndexes" </span><span style="color: #007700">=> </span><span style="color: #0000BB">$collection</span><span style="color: #007700">-></span><span style="color: #0000BB">getName</span><span style="color: #007700">(), </span><span style="color: #DD0000">"index" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"superfast query"</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<p class="para">
To find what an index is named, you can query the
<em>system.indexes</em> collection of a database and look for the
<em>name</em> field.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-mongocollection.deleteindex-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term">
<em><code class="parameter">keys</code></em>
</span>
<dd>
<p class="para">
Field or fields from which to delete the index.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-mongocollection.deleteindex-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the database response.
</p>
</div>
<div class="refsect1 examples" id="refsect1-mongocollection.deleteindex-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-1438">
<p><strong>Example #1 <span class="function"><strong>MongoCollection::deleteIndex()</strong></span> example</strong></p>
<div class="example-contents"><p>
This example passes the function string and array parameters.
</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$m </span><span style="color: #007700">= new </span><span style="color: #0000BB">MongoClient</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #0000BB">$m</span><span style="color: #007700">-></span><span style="color: #0000BB">example</span><span style="color: #007700">-></span><span style="color: #0000BB">indices</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// create an index<br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">ensureIndex</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"i"</span><span style="color: #007700">=></span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// remove a simple index<br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">deleteIndex</span><span style="color: #007700">(</span><span style="color: #DD0000">"i"</span><span style="color: #007700">);<br /><br /><br /></span><span style="color: #FF8000">// create a multi-key index<br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">ensureIndex</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"j" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"k" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// remove a multi-key index<br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">deleteIndex</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"j" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"k" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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