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

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  <refentry id="function.floor">
   <refnamediv>
    <refname>floor</refname>
    <refpurpose>Round fractions down</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>float</type><methodname>floor</methodname>
      <methodparam><type>float</type><parameter>value</parameter></methodparam>
     </methodsynopsis>
    <simpara>
     Returns the next lowest integer value by rounding down
     <parameter>value</parameter> if necessary. 
     The return value of <function>floor</function> is still of type
     <type>float</type> because the value range of <type>float</type> is 
     usually bigger than that of <type>int</type>.
    </simpara>
    <example>
     <title><function>floor</function> examples</title>
     <programlisting role="php">
<![CDATA[
$four = floor(4.3);   // $four = 4.0;
$nine = floor(9.999); // $nine = 9.0;
]]>
     </programlisting>
    </example>
    <simpara>
     See also <function>ceil</function> and
     <function>round</function>.
    </simpara>
   </refsect1>
  </refentry>

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