fprintf.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- EN-Revision: n/a Maintainer: darvina Status: ready -->
  <refentry xml:id="function.fprintf" xmlns="http://docbook.org/ns/docbook">
   <refnamediv>
    <refname>fprintf</refname>
    <refpurpose>Scrive una stringa formattata in uno stream</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Descrizione</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>
     La funzione scrive una stringa formattata in base al parametro 
     <parameter>format</parameter> nello stream indicato dal parametro
     <parameter>handle</parameter>. I valori per il parametro <parameter>format</parameter>
     sono descritti nella documentazione della funzione <function>sprintf</function>.
    </simpara>
    <simpara>
     Restituisce la lunghezza della stringa prodotta.
    </simpara>
    <simpara>
     Vedere anche: <function>printf</function>,
     <function>sprintf</function>,
     <function>sscanf</function>, <function>fscanf</function>, 
     <function>vsprintf</function> e
     <function>number_format</function>.
    </simpara>
   </refsect1>
   <refsect1>
    <title>Esempi</title>
    <para>
     <example>
      <title><function>fprintf</function>: interi completati con zero</title>
      <programlisting role="php">
<![CDATA[
<?php
if (!($fp = fopen('date.txt', 'w')))
    return;
 
fprintf($fp, "%04d-%02d-%02d", $year, $month, $day);
// Scrive la data in formato ISO nel file date.txt
?>
]]>
      </programlisting>
     </example>
     <example>
      <title><function>fprintf</function>: formattazione della moneta</title>
      <programlisting role="php">
<![CDATA[
<?php
if (!($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);
// scrive "123.10" nel file currency.txt
 
echo "wrote $len bytes to currency.txt";
// utilizza il valore restituito da fprintf per stabilire quanti byte sono stati scritti
?>
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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