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<h1 class="refname">Memcached::incrementByKey</h1>
<p class="verinfo">(PECL memcached >= 2.0.0)</p><p class="refpurpose"><span class="refname">Memcached::incrementByKey</span> — <span class="dc-title">Increment numeric item's value, stored on a specific server</span></p>
</div>
<div class="refsect1 description" id="refsect1-memcached.incrementbykey-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">int</span> <span class="methodname"><strong>Memcached::incrementByKey</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$server_key</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 1</span></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$initial_value</code><span class="initializer"> = 0</span></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$expiry</code><span class="initializer"> = 0</span></span>
]]] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>Memcached::incrementByKey()</strong></span> increments a numeric item's value
by the specified <em><code class="parameter">offset</code></em>. If the item's value is not
numeric, an error will result.
<span class="function"><strong>Memcached::incrementByKey()</strong></span> will set the item to the
<em><code class="parameter">initial_value</code></em> parameter if the key doesn't exist.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-memcached.incrementbykey-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">server_key</code></em></span>
<dd>
<p class="para">
The key identifying the server to store the value on or retrieve it from. Instead of hashing on the actual key for the item, we hash on the server key when deciding which memcached server to talk to. This allows related items to be grouped together on a single server for efficiency with multi operations.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">key</code></em></span>
<dd>
<p class="para">
The key of the item to increment.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">offset</code></em></span>
<dd>
<p class="para">
The amount by which to increment the item's value.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">initial_value</code></em></span>
<dd>
<p class="para">
The value to set the item to if it doesn't currently exist.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">expiry</code></em></span>
<dd>
<p class="para">
The expiry time to set on the item.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-memcached.incrementbykey-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns new item's value on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-memcached.incrementbykey-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="methodname"><a href="memcached.decrement.html" class="methodname" rel="rdfs-seeAlso">Memcached::decrement()</a> - Decrement numeric item's value</span></li>
<li class="member"> <span class="methodname"><a href="memcached.decrementbykey.html" class="methodname" rel="rdfs-seeAlso">Memcached::decrementByKey()</a> - Decrement numeric item's value, stored on a specific server</span></li>
<li class="member"> <span class="methodname"><a href="memcached.increment.html" class="methodname" rel="rdfs-seeAlso">Memcached::increment()</a> - Increment numeric item's value</span></li>
</ul>
</p>
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