php-doc-en/reference/strings/functions/number-format.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.number-format" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>number_format</refname>
  <refpurpose>Format a number with grouped thousands</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>number_format</methodname>
   <methodparam><type>float</type><parameter>number</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>decimals</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <methodsynopsis>
   <type>string</type><methodname>number_format</methodname>
   <methodparam><type>float</type><parameter>number</parameter></methodparam>
   <methodparam><type>int</type><parameter>decimals</parameter><initializer>0</initializer></methodparam>
   <methodparam><type>string</type><parameter>dec_point</parameter><initializer>'.'</initializer></methodparam>
   <methodparam><type>string</type><parameter>thousands_sep</parameter><initializer>','</initializer></methodparam>
  </methodsynopsis>
  <para>
   This function accepts either one, two, or four parameters (not three):
  </para>
  <para>
   If only one parameter is given,
   <parameter>number</parameter> will be formatted without decimals,
   but with a comma (",") between every group of thousands.
  </para>
  <para>
   If two parameters are given, <parameter>number</parameter> will
   be formatted with <parameter>decimals</parameter> decimals with a
   dot (".") in front, and a comma (",") between every group of
   thousands.
  </para>
  <para>
   If all four parameters are given, <parameter>number</parameter>
   will be formatted with <parameter>decimals</parameter> decimals,
   <parameter>dec_point</parameter> instead of a dot (".") before
   the decimals and <parameter>thousands_sep</parameter> instead of
   a comma (",") between every group of thousands.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A formatted version of <parameter>number</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>number</parameter></term>
     <listitem>
      <para>
       The number being formatted.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>decimals</parameter></term>
     <listitem>
      <para>
       Sets the number of decimal points.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>dec_point</parameter></term>
     <listitem>
      <para>
       Sets the separator for the decimal point.
      </para>
      <para>
       This function only takes the first byte for the 
       separator. This means that multibyte characters will 
       <emphasis>NOT</emphasis> work, resulting in a broken multibyte 
       sequence.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>thousands_sep</parameter></term>
     <listitem>
      <para>
       Sets the thousands separator.
      </para>
      <para>
       Only the first byte of <parameter>thousands_sep</parameter>
       is used. For example, if you use <literal>&amp;amp;</literal> as
       <parameter>thousands_sep</parameter> on the number
       <literal>1000</literal>, <function>number_format</function> will
       return <literal>1&amp;000</literal>.
      </para>
      <para>
       As noted above in the description of the <parameter>dec_point</parameter> 
       parameter, then this function is not multibyte aware so using multibyte 
       characters as separators will result in broken sequences.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>number_format</function> Example</title>
    <para>
     For instance, French notation usually use two decimals,
     comma (',') as decimal separator, and space (' ') as
     thousand separator. This is achieved with this line :
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$number = 1234.56;

// english notation (default)
$english_format_number = number_format($number);
// 1,235

// French notation
$nombre_format_francais = number_format($number, 2, ',', ' ');
// 1 234,56

$number = 1234.5678;

// english notation without thousands seperator
$english_format_number = number_format($number, 2, '.', '');
// 1234.57

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>money_format</function></member>
    <member><function>sprintf</function></member>
    <member><function>printf</function></member>
    <member><function>sscanf</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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