define.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.define" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>define</refname>
  <refpurpose>Definisce una costante</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>define</methodname>
   <methodparam><type>string</type><parameter>name</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>case_insensitive</parameter><initializer>false</initializer></methodparam>
  </methodsynopsis>
  <para>
   Definisce una costante alfanumerica durante l'esecuzione.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>name</parameter></term>
     <listitem>
      <para>
       Il nome della costante.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       Il valore della costante; solo valori scalari e <type>null</type> sono consentiti.
       I valori scalari comprendono <type>integer</type>, 
       <type>float</type>, <type>string</type> o <type>boolean</type>. E' anche
       possibile definire costanti di tipo <type>resource</type>, tuttavia non è raccomandato
       e può causare comportamenti imprevedibili.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>case_insensitive</parameter></term>
     <listitem>
      <para>
       Se settato a &true;, la costante viene definita case-insensitive.
       Il comportamento di default è case-sensitive; per esempio 
       <literal>CONSTANT</literal> e <literal>Constant</literal> rappresentano
       valori diversi.
      </para>
      <note>
       <para>
        Le costanti case-insensitive vengono salvate internamente in minuscolo.
       </para>
      </note>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Definire costanti</title>
    <programlisting role="php">
<![CDATA[
<?php
define("CONSTANT", "Ciao Mondo!");
echo CONSTANT; // output "Ciao Mondo!"
echo Constant; // output "Ciao Mondo!" e genera un notice.

define("GREETING", "Ciao Mondo!", true);
echo GREETING; // output "Ciao Mondo!"
echo Greeting; // output "Ciao Mondo!"

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>defined</function></member>
    <member><function>constant</function></member>
    <member>La sezione sulle <link linkend="language.constants">Costanti</link></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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