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

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<refentry xml:id="function.number-format" xmlns="http://docbook.org/ns/docbook" 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>num</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>decimals</parameter><initializer>0</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>decimal_separator</parameter><initializer>"."</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>thousands_separator</parameter><initializer>","</initializer></methodparam>
  </methodsynopsis>
  <para>
   Formats a number with grouped thousands and optionally decimal digits.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>num</parameter></term>
     <listitem>
      <para>
       The number being formatted.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>decimals</parameter></term>
     <listitem>
      <para>
       Sets the number of decimal digits.
       If <literal>0</literal>, the <parameter>decimal_separator</parameter> is
       omitted from the return value.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>decimal_separator</parameter></term>
     <listitem>
      <para>
       Sets the separator for the decimal point.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>thousands_separator</parameter></term>
     <listitem>
      <para>
       Sets the thousands separator.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

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

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>8.0.0</entry>
       <entry>
        Prior to this version, <function>number_format</function> accepted
        one, two, or four parameters (but not three).
       </entry>
      </row>
      <row>
       <entry>7.2.0</entry>
       <entry>
        <function>number_format</function> was changed to not being able to return 
        <literal>-0</literal>, previously <literal>-0</literal> could be returned 
        for cases like where <parameter>num</parameter> would be <literal>-0.01</literal>.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </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. The following example demonstrates various ways to format a number:
    </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 separator
$english_format_number = number_format($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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