iterations.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- EN-Revision: 1fb0ef23d7be0d8ecd9604fce16ee1e0842c6ef6 Maintainer: lacatoire Status: ready -->
 <sect1 xml:id="language.oop5.iterations" xmlns="http://docbook.org/ns/docbook">
  <title>Iterazione degli oggetti</title>
  <para>

   PHP fornisce un modo per definire gli oggetti in modo tale che sia possibile iterare
   attraverso un elenco di elementi, ad esempio con un'istruzione &foreach;. Per impostazione predefinita,
   tutte le proprietà <link linkend="language.oop5.visibility">visibili</link> verranno utilizzate
   per l'iterazione.

  </para>

  <example>
   <title>Iterazione semplice degli oggetti</title>
   <programlisting role="php">
<![CDATA[
<?php
class MyClass
{
    public $var1 = 'value 1';
    public $var2 = 'value 2';
    public $var3 = 'value 3';

    protected $protected = 'protected var';
    private   $private   = 'private var';

    function iterateVisible() {
       echo "MyClass::iterateVisible:\n";
       foreach ($this as $key => $value) {
           print "$key => $value\n";
       }
    }
}

$class = new MyClass();

foreach($class as $key => $value) {
    print "$key => $value\n";
}
echo "\n";


$class->iterateVisible();

?>
]]>
   </programlisting>
   &example.outputs;
   <screen role="php">
<![CDATA[
var1 => value 1
var2 => value 2
var3 => value 3

MyClass::iterateVisible:
var1 => value 1
var2 => value 2
var3 => value 3
protected => protected var
private => private var
]]>
   </screen>

  </example>

 <para>
  Come mostra l'output, il &foreach; ha iterato attraverso tutte le
  proprietà <link linkend="language.oop5.visibility">visibili</link> a cui era possibile
  accedere.
 </para>

 <simplesect role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><link linkend="language.generators">Generatori</link></member>
    <member><interfacename>Iterator</interfacename></member>
    <member><interfacename>IteratorAggregate</interfacename> </member>
    <member><link linkend="spl.iterators">Iteratori SPL</link></member>
   </simplelist>
  </para>
 </simplesect>

 </sect1>
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