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<title>Decimal to binary</title>
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<div class="refnamediv">
<h1 class="refname">decbin</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">decbin</span> — <span class="dc-title">Decimal to binary</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.decbin-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>decbin</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 binary representation of the given
<em><code class="parameter">number</code></em> argument.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.decbin-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">
Decimal value to convert
</p>
<table class="doctable table">
<caption><strong>Range of inputs on 32-bit machines</strong></caption>
<col />
<col />
<col />
<thead>
<tr>
<th>positive <em><code class="parameter">number</code></em></th>
<th>negative <em><code class="parameter">number</code></em></th>
<th>return value</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>0</td>
<td class="empty"> </td>
<td>0</td>
</tr>
<tr>
<td>1</td>
<td class="empty"> </td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td class="empty"> </td>
<td>10</td>
</tr>
<tr>
<td colspan="3">... normal progression ...</td>
</tr>
<tr>
<td>2147483646</td>
<td class="empty"> </td>
<td>1111111111111111111111111111110</td>
</tr>
<tr>
<td>2147483647 (largest signed integer)</td>
<td class="empty"> </td>
<td>1111111111111111111111111111111 (31 1's)</td>
</tr>
<tr>
<td>2147483648</td>
<td>-2147483648</td>
<td>10000000000000000000000000000000</td>
</tr>
<tr>
<td colspan="3">... normal progression ...</td>
</tr>
<tr>
<td>4294967294</td>
<td>-2</td>
<td>11111111111111111111111111111110</td>
</tr>
<tr>
<td>4294967295 (largest unsigned integer)</td>
<td>-1</td>
<td>11111111111111111111111111111111 (32 1's)</td>
</tr>
</tbody>
</table>
<table class="doctable table">
<caption><strong>Range of inputs on 64-bit machines</strong></caption>
<col />
<col />
<col />
<thead>
<tr>
<th>positive <em><code class="parameter">number</code></em></th>
<th>negative <em><code class="parameter">number</code></em></th>
<th>return value</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>0</td>
<td class="empty"> </td>
<td>0</td>
</tr>
<tr>
<td>1</td>
<td class="empty"> </td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td class="empty"> </td>
<td>10</td>
</tr>
<tr>
<td colspan="3">... normal progression ...</td>
</tr>
<tr>
<td>9223372036854775806</td>
<td class="empty"> </td>
<td>111111111111111111111111111111111111111111111111111111111111110</td>
</tr>
<tr>
<td>9223372036854775807 (largest signed integer)</td>
<td class="empty"> </td>
<td>111111111111111111111111111111111111111111111111111111111111111 (63 1's)</td>
</tr>
<tr>
<td class="empty"> </td>
<td>-9223372036854775808</td>
<td>1000000000000000000000000000000000000000000000000000000000000000</td>
</tr>
<tr>
<td colspan="3">... normal progression ...</td>
</tr>
<tr>
<td class="empty"> </td>
<td>-2</td>
<td>1111111111111111111111111111111111111111111111111111111111111110</td>
</tr>
<tr>
<td class="empty"> </td>
<td>-1</td>
<td>1111111111111111111111111111111111111111111111111111111111111111 (64 1's)</td>
</tr>
</tbody>
</table>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.decbin-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Binary string representation of <em><code class="parameter">number</code></em>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.decbin-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3453">
<p><strong>Example #1 <span class="function"><strong>decbin()</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">decbin</span><span style="color: #007700">(</span><span style="color: #0000BB">12</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">decbin</span><span style="color: #007700">(</span><span style="color: #0000BB">26</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>
1100
11010
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.decbin-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.bindec.html" class="function" rel="rdfs-seeAlso">bindec()</a> - Binary to decimal</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.dechex.html" class="function" rel="rdfs-seeAlso">dechex()</a> - Decimal to hexadecimal</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>
<li class="member">
<span class="function"><a href="function.printf.html" class="function" rel="rdfs-seeAlso">printf()</a> - Output a formatted string</span>, using <em>%b</em>,
<em>%032b</em> or <em>%064b</em> as the format
</li>
<li class="member">
<span class="function"><a href="function.sprintf.html" class="function">sprintf()</a></span>, using <em>%b</em>,
<em>%032b</em> or <em>%064b</em> as the format
</li>
</ul>
</p>
</div>
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