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

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  <refentry id="function.hexdec">
   <refnamediv>
    <refname>hexdec</refname>
    <refpurpose>Hexadecimal to decimal</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>number</type><methodname>hexdec</methodname>
      <methodparam><type>string</type><parameter>hex_string</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns the decimal equivalent of the hexadecimal number
     represented by the <parameter>hex_string</parameter> argument.
     <function>hexdec</function> converts a hexadecimal string to a
     decimal number. The largest number that can be converted is
     7fffffff or 2147483647 in decimal.
     As of PHP 4.1.0, this function can also convert larger numbers. It returns
     <type>float</type> in that case.
    </para>
    <para>
     <function>hexdec</function> will ignore any non-hexadecimal 
     characters it encounters.
     <example>
      <title><function>hexdec</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
var_dump(hexdec("See"));
var_dump(hexdec("ee"));
// both print "int(238)"

var_dump(hexdec("that")); // print "int(10)"
var_dump(hexdec("a0")); // print "int(160)"
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>dechex</function>,
     <function>bindec</function>,
     <function>octdec</function> and
     <function>base_convert</function>.
    </para>
   </refsect1>
  </refentry>

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