while.xml

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<sect1 xml:id="control-structures.while" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title><literal>while</literal></title>
 <?phpdoc print-version-for="while"?>
 <para>
  I cicli <literal>while</literal> sono i più semplici tipi di loop in PHP.
  Questi cicli si comportano esattamente come nel C. 
  La forma base di un'istruzione <literal>while</literal> è:
  <informalexample>
   <programlisting>
<![CDATA[
while (expr)
    statement
]]>
   </programlisting>
  </informalexample>
 </para>
 <simpara>
  The meaning of a <literal>while</literal> statement is simple.  It
  tells PHP to execute the nested statement(s) repeatedly, as long
  as the <literal>while</literal> expression evaluates to
  &true;.  The value of the expression is checked
  each time at the beginning of the loop, so even if this value
  changes during the execution of the nested statement(s), execution
  will not stop until the end of the iteration (each time PHP runs
  the statements in the loop is one iteration).  Sometimes, if the
  <literal>while</literal> expression evaluates to
  &false; from the very beginning, the nested
  statement(s) won't even be run once.
 </simpara>
 <para>
  Like with the <literal>if</literal> statement, you can group
  multiple statements within the same <literal>while</literal> loop
  by surrounding a group of statements with curly braces, or by
  using the alternate syntax:
  <informalexample>
   <programlisting>
<![CDATA[
while (expr):
    statement
    ...
endwhile;
]]>
   </programlisting>
  </informalexample>
 </para>
 <para>
  Gli esempi seguenti sono identici, ed entrambi stampano i numeri da 1 a 10:
  <informalexample>
   <programlisting role="php">
<![CDATA[
<?php
/* example 1 */

$i = 1;
while ($i <= 10) {
    echo $i++;  /* the printed value would be
                   $i before the increment
                   (post-increment) */
}

/* example 2 */

$i = 1;
while ($i <= 10):
    echo $i;
    $i++;
endwhile;
?>
]]>
   </programlisting>
  </informalexample>
 </para>
</sect1>

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