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<title>Decimal to hexadecimal</title>
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<h1 class="refname">dechex</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">dechex</span> — <span class="dc-title">Decimal to hexadecimal</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.dechex-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>dechex</strong></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$number</code></span>
)</div>
<p class="para rdfs-comment">
Returns a string containing a hexadecimal representation of the given
unsigned <em><code class="parameter">number</code></em> argument.
</p>
<p class="para">
The largest number that can be converted is
<strong><code>PHP_INT_MAX</code></strong><em> * 2 + 1</em> (or
<em>-1</em>): on 32-bit platforms, this will be
<em>4294967295</em> in decimal, which results in
<span class="function"><strong>dechex()</strong></span> returning <em>ffffffff</em>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.dechex-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">number</code></em></span>
<dd>
<p class="para">
The decimal value to convert.
</p>
<p class="para">
As PHP's <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> type is signed, but
<span class="function"><strong>dechex()</strong></span> deals with unsigned integers, negative
integers will be treated as though they were unsigned.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.dechex-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Hexadecimal string representation of <em><code class="parameter">number</code></em>.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.dechex-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3454">
<p><strong>Example #1 <span class="function"><strong>dechex()</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">echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">47</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></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>
a
2f
</pre></div>
</div>
</div>
</p>
<p class="para">
<div class="example" id="example-3455">
<p><strong>Example #2 <span class="function"><strong>dechex()</strong></span> example with large integers</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// The output below assumes a 32-bit platform.<br />// Note that the output is the same for all values.<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(-</span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">PHP_INT_MAX </span><span style="color: #007700">* </span><span style="color: #0000BB">2 </span><span style="color: #007700">+ </span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">pow</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">32</span><span style="color: #007700">) - </span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></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>
ffffffff
ffffffff
ffffffff
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.dechex-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.hexdec.html" class="function" rel="rdfs-seeAlso">hexdec()</a> - Hexadecimal to decimal</span></li>
<li class="member"> <span class="function"><a href="function.decbin.html" class="function" rel="rdfs-seeAlso">decbin()</a> - Decimal to binary</span></li>
<li class="member"> <span class="function"><a href="function.decoct.html" class="function" rel="rdfs-seeAlso">decoct()</a> - Decimal to octal</span></li>
<li class="member"> <span class="function"><a href="function.base-convert.html" class="function" rel="rdfs-seeAlso">base_convert()</a> - Convert a number between arbitrary bases</span></li>
</ul>
</p>
</div>
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