php-doc-en/reference/strings/functions/fprintf.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
  <refentry id="function.fprintf">
   <refnamediv>
    <refname>fprintf</refname>
    <refpurpose>Write a formatted string to a stream</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>fprintf</methodname>
      <methodparam><type>resource</type><parameter>handle</parameter></methodparam>
      <methodparam><type>string</type><parameter>format</parameter></methodparam>
      <methodparam choice="opt"><type>mixed</type><parameter>args</parameter></methodparam>
      <methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
     </methodsynopsis>
    <simpara>
     Write a string produced according to <parameter>format</parameter>
     to the stream resource specified by <parameter>handle</parameter>.
     <parameter>format</parameter> is described in the documentation for
     <function>sprintf</function>.
    </simpara>
    <simpara>
     Returns the length of the outputted string.
    </simpara>
    <simpara>
     See also: <function>printf</function>,
     <function>sprintf</function>,
     <function>sscanf</function>, <function>fscanf</function>, 
     <function>vsprintf</function>, and
     <function>number_format</function>.
    </simpara>
   </refsect1>
   <refsect1>
    <title>Examples</title>
    <para>
     <example>
      <title><function>fprintf</function>: zero-padded integers</title>
      <programlisting role="php">
<![CDATA[
<?php
if (!($fp = fopen('date.txt', 'w')))
    return;

fprintf($fp, "%04d-%02d-%02d", $year, $month, $day);
// will write the formatted ISO date to date.txt
?>
]]>
      </programlisting>
     </example>
     <example>
      <title><function>fprintf</function>: formatting currency</title>
      <programlisting role="php">
<![CDATA[
<?php
if (!($fp = fopen('currency.txt', 'w')))
    return;

$money1 = 68.75;
$money2 = 54.35;
$money = $money1 + $money2;
// echo $money will output "123.1";
$len = fprintf($fp, '%01.2f', $money);
// will write "123.10" to currency.txt

echo "wrote $len bytes to currency.txt";
// use the return value of fprintf to determine how many bytes we wrote
?>
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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