php-doc-en/reference/math/functions/decbin.xml

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  <refentry id="function.decbin">
   <refnamediv>
    <refname>decbin</refname>
    <refpurpose>Decimal to binary</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>decbin</methodname>
      <methodparam><type>int</type><parameter>number</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns a string containing a binary representation of the given
     <parameter>number</parameter> argument.  The largest number that can be converted is
     4294967295 in decimal resulting to a string of 32 1's.
    </para>
    <para>
     <example>
      <title><function>decbin</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
echo decbin(12) . "\n";
echo decbin(26);
?>
]]>
      </programlisting>
      <para>
       The above example will output:
      </para>
      <screen>
<![CDATA[
1100
11010
]]>
      </screen>
     </example>
    </para>
    <para>
     See also <function>bindec</function>,
     <function>decoct</function>,
     <function>dechex</function> and
     <function>base_convert</function>.
    </para>
   </refsect1>
  </refentry>

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