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<?xml version="1.0" encoding="utf-8"?> | |
<!-- EN Version: 5c8a92d1c5ab04b7895854172db0a6d257eca283 Maintainer: lucalzetta Status: ready --> | |
<!-- $Revision$ --> | |
<appendix xml:id="reserved" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"> | |
<title>Lista delle parole riservate</title> | |
<para> | |
Quella che segue è una lista degli identificatori predefiniti in PHP. Nessuno | |
degli identificatori elencati qui può essere usato come identificatore in alcuno | |
dei vostri scripts senza essere esplicitamente annotato diversamente. Queste liste includono parole chiave e variabili predefinite, | |
costanti, e nomi di classi. Questa lista non è esaustiva e neppure | |
completa. | |
</para> | |
<sect1 xml:id="reserved.keywords"> | |
<title>Elenco delle parole chiave</title> | |
<simpara> | |
Queste parole hanno un significato speciale in PHP. Alcune di esse rappresentano oggetti | |
che appaiono come funzioni, altre come costanti, e altro ancora - ma | |
non lo sono, in realtà: sono dei costrutti del linguaggio. Non si può usare alcuna | |
delle seguenti parole come constante, nome di classe, nome di funzione o metodo. | |
L'uso di queste parole per nominare una variabile generalmente è consentito ma potrebbe generare confusione. | |
</simpara> | |
<simpara> | |
A partire da PHP 7.0.0 queste parole chiave sono consentite come nomi di proprietà, constanti, e | |
metodi di classi, interfacce e tratti, ad eccezione di | |
<literal>class</literal> non possono essere usate come nomi di costanti. | |
</simpara> | |
<table> | |
<title>Parole chiave di PHP</title> | |
<tgroup cols="5"> | |
<tbody> | |
<row> | |
<entry> | |
<function>__halt_compiler</function> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.abstract">abstract</link> | |
</entry> | |
<entry> | |
<link linkend="language.operators.logical">and</link> | |
</entry> | |
<entry> | |
<function>array</function> | |
</entry> | |
<entry> | |
<link linkend="control-structures.foreach">as</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="control-structures.break">break</link> | |
</entry> | |
<entry> | |
<link linkend="language.types.callable">callable</link> (a partire da PHP 5.4) | |
</entry> | |
<entry> | |
<link linkend="control-structures.switch">case</link> | |
</entry> | |
<entry> | |
<link linkend="language.exceptions">catch</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.basic.class">class</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="language.oop5.cloning">clone</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.constants">const</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.continue">continue</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.declare">declare</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.switch">default</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<function>die</function> | |
</entry> | |
<entry> | |
<link linkend="control-structures.do.while">do</link> | |
</entry> | |
<entry> | |
<function>echo</function> | |
</entry> | |
<entry> | |
<link linkend="control-structures.else">else</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.elseif">elseif</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<function>empty</function> | |
</entry> | |
<entry> | |
<link linkend="control-structures.declare">enddeclare</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.alternative-syntax">endfor</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.alternative-syntax">endforeach</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.alternative-syntax">endif</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="control-structures.alternative-syntax">endswitch</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.alternative-syntax">endwhile</link> | |
</entry> | |
<entry> | |
<function>eval</function> | |
</entry> | |
<entry> | |
<function>exit</function> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.basic.extends">extends</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="language.oop5.final">final</link> | |
</entry> | |
<entry> | |
<link linkend="language.exceptions">finally</link> (a partire da PHP 5.5) | |
</entry> | |
<entry> | |
<link linkend="functions.arrow">fn</link> (a partire da PHP 7.4) | |
</entry> | |
<entry> | |
<link linkend="control-structures.for">for</link> | |
</entry> | |
<entry> | |
&foreach; | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="functions.user-defined">function</link> | |
</entry> | |
<entry> | |
<link linkend="language.variables.scope">global</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.goto">goto</link> (a partire da PHP 5.3) | |
</entry> | |
<entry> | |
<link linkend="control-structures.if">if</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.interfaces">implements</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<function>include</function> | |
</entry> | |
<entry> | |
<function>include_once</function> | |
</entry> | |
<entry> | |
<link linkend="language.operators.type">instanceof</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.traits.conflict">insteadof</link> (a partire da PHP 5.4) | |
</entry> | |
<entry> | |
<link linkend="language.oop5.interfaces">interface</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<function>isset</function> | |
</entry> | |
<entry> | |
<function>list</function> | |
</entry> | |
<entry> | |
<link linkend="control-structures.match">match</link> (a partire da PHP 8.0) | |
</entry> | |
<entry> | |
<link linkend="language.namespaces">namespace</link> (a partire da PHP 5.3) | |
</entry> | |
<entry> | |
<link linkend="language.oop5.basic.new">new</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="language.operators.logical">or</link> | |
</entry> | |
<entry> | |
<function>print</function> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.visibility">private</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.visibility">protected</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.visibility">public</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<function>require</function> | |
</entry> | |
<entry> | |
<function>require_once</function> | |
</entry> | |
<entry> | |
<function>return</function> | |
</entry> | |
<entry> | |
<link linkend="language.variables.scope">static</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.switch">switch</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="language.exceptions">throw</link> | |
</entry> | |
<entry> | |
<link linkend="language.oop5.traits">trait</link> (a partire da PHP 5.4) | |
</entry> | |
<entry> | |
<link linkend="language.exceptions">try</link> | |
</entry> | |
<entry> | |
<function>unset</function> | |
</entry> | |
<entry> | |
<link linkend="language.namespaces">use</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="language.oop5.properties">var</link> | |
</entry> | |
<entry> | |
<link linkend="control-structures.while">while</link> | |
</entry> | |
<entry> | |
<link linkend="language.operators.logical">xor</link> | |
</entry> | |
<entry> | |
<link linkend="language.generators">yield</link> (a partire da PHP 5.5) | |
</entry> | |
<entry> | |
<link linkend="control-structures.yield.from">yield from</link> (a partire da PHP 7.0) | |
</entry> | |
</row> | |
</tbody> | |
</tgroup> | |
</table> | |
<table> | |
<title>Costanti Compile-time</title> | |
<tgroup cols="5"> | |
<tbody> | |
<row> | |
<entry> | |
<link linkend="language.constants.predefined">__CLASS__</link> | |
</entry> | |
<entry> | |
<link linkend="language.constants.predefined">__DIR__</link> (a partire da PHP 5.3) | |
</entry> | |
<entry> | |
<link linkend="language.constants.predefined">__FILE__</link> | |
</entry> | |
<entry> | |
<link linkend="language.constants.predefined">__FUNCTION__</link> | |
</entry> | |
<entry> | |
<link linkend="language.constants.predefined">__LINE__</link> | |
</entry> | |
<entry> | |
<link linkend="language.constants.predefined">__METHOD__</link> | |
</entry> | |
</row> | |
<row> | |
<entry> | |
<link linkend="language.namespaces.nsconstants">__NAMESPACE__</link> (a partire da PHP 5.3) | |
</entry> | |
<entry> | |
<link linkend="language.constants.predefined">__TRAIT__</link> (a partire da PHP 5.4) | |
</entry> | |
<entry> | |
</entry> | |
<entry> | |
</entry> | |
<entry> | |
</entry> | |
<entry> | |
</entry> | |
</row> | |
</tbody> | |
</tgroup> | |
</table> | |
</sect1> | |
<sect1 xml:id="reserved.classes"> | |
<title>Classi predefinite</title> | |
<para> | |
Questa sezione elenca le classi predefinite standard. Varie extensions | |
definiscono altre classi che sono descritte nelle loro referenze. | |
</para> | |
<sect2 xml:id="reserved.classes.standard"> | |
<title>Classi Predefinite Standard</title> | |
<simpara> | |
Queste classi sono definite nel set di funzioni standard incluse | |
nella build di PHP. | |
</simpara> | |
<variablelist> | |
<varlistentry> | |
<term><classname>Directory</classname></term> | |
<listitem> | |
<simpara> | |
Creata da <function>dir</function>. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>stdClass</classname></term> | |
<listitem> | |
<simpara> | |
Creata da <link linkend="language.types.object.casting">typecasting | |
in oggetto</link>. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>__PHP_Incomplete_Class</classname></term> | |
<listitem> | |
<simpara> | |
Forse creata da <function>unserialize</function>. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
</variablelist> | |
</sect2> | |
<sect2 xml:id="reserved.classes.php5"> | |
<title>Classi predefinite a partire da PHP 5</title> | |
<simpara> | |
Queste ulteriori classi predefinite sono state introdotte in | |
PHP 5.0.0. | |
</simpara> | |
<variablelist> | |
<varlistentry> | |
<term><classname>Exception</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>ErrorException</classname></term> | |
<listitem> | |
<simpara> | |
Disponibile da PHP 5.1.0. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>php_user_filter</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
</variablelist> | |
</sect2> | |
<sect2 xml:id="reserved.classes.closure"> | |
<title>Closure</title> | |
<simpara> | |
La classe final predefinita <classname>Closure</classname> fu introdotta | |
in PHP 5.3.0. Essa è usata per rappresentare <link | |
linkend="functions.anonymous">funzioni anonime</link>. | |
</simpara> | |
<simpara> | |
Per ulteriori informazioni si può consultare <link linkend="class.closure">la pagina | |
della classe</link>. | |
</simpara> | |
</sect2> | |
<sect2 xml:id="reserved.classes.generator"> | |
<title>Generator</title> | |
<simpara> | |
La classe final predefinita <classname>Generator</classname> fu introdotta | |
in PHP 5.5.0. Essa è usata per rappresentare <link | |
linkend="language.generators">generatori</link>. | |
</simpara> | |
<simpara> | |
Per ulteriori informazioni si può consultare <link linkend="class.generator">la pagina | |
della classe</link>. | |
</simpara> | |
</sect2> | |
<sect2 xml:id="reserved.classes.php7"> | |
<title>Interfacce e classi predefinite a partire da PHP 7</title> | |
<simpara> | |
Queste interfacce e classi predefinite furono introdotte in | |
PHP 7.0.0. | |
</simpara> | |
<variablelist> | |
<varlistentry> | |
<term><classname>ArithmeticError</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>AssertionError</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>DivisionByZeroError</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>Error</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>Throwable</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>ParseError</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>TypeError</classname></term> | |
<listitem> | |
<simpara> | |
</simpara> | |
</listitem> | |
</varlistentry> | |
</variablelist> | |
</sect2> | |
<sect2 xml:id="reserved.classes.special"> | |
<title>Classi speciali</title> | |
<simpara> | |
I seguenti identificatori non possono essere usati come nomi di classe in quanto hanno | |
uno scopo speciale. | |
</simpara> | |
<variablelist> | |
<varlistentry> | |
<term><classname>self</classname></term> | |
<listitem> | |
<simpara> | |
<link linkend="language.oop5.paamayim-nekudotayim">Classe | |
corrente</link>. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>static</classname></term> | |
<listitem> | |
<simpara> | |
<link linkend="language.oop5.late-static-bindings">Classe corrente in | |
runtime</link>. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
<varlistentry> | |
<term><classname>parent</classname></term> | |
<listitem> | |
<simpara> | |
<link linkend="language.oop5.paamayim-nekudotayim">Classe | |
padre</link>. | |
</simpara> | |
</listitem> | |
</varlistentry> | |
</variablelist> | |
</sect2> | |
</sect1> | |
&appendices.reserved.constants; | |
<sect1 xml:id="reserved.other-reserved-words"> | |
<title>Elenco di altre parole riservate</title> | |
<simpara> | |
Le seguenti parole non possono essere usate per nominare una classe, interfacce o traits e | |
non è neanche consentito usarle all'interno di namespace. | |
</simpara> | |
<para> | |
<table> | |
<title>Parole riservate</title> | |
<tgroup cols="5"> | |
<tbody> | |
<row> | |
<entry> | |
int (a partire da PHP 7) | |
</entry> | |
<entry> | |
float (a partire da PHP 7) | |
</entry> | |
<entry> | |
bool (a partire da PHP 7) | |
</entry> | |
<entry> | |
string (a partire da PHP 7) | |
</entry> | |
</row> | |
<row> | |
<entry> | |
true (a partire da PHP 7) | |
</entry> | |
<entry> | |
false (a partire da PHP 7) | |
</entry> | |
<entry> | |
null (a partire da PHP 7) | |
</entry> | |
<entry> | |
void (a partire da PHP 7.1) | |
</entry> | |
</row> | |
<row> | |
<entry> | |
iterable (a partire da PHP 7.1) | |
</entry> | |
<entry> | |
object (a partire da PHP 7.2) | |
</entry> | |
</row> | |
</tbody> | |
</tgroup> | |
</table> | |
</para> | |
<para> | |
La seguente lista di parole ha una leggera riserva d'uso. | |
Nonostante esse possano essere usate come nomi di classi, interfacce, e traits (così | |
come all'interno di namespace), il loro uso è fortemente scoraggiato perchè potrebbero | |
venire adottate in successive versioni di PHP. | |
</para> | |
<para> | |
<table> | |
<title>Parole con riserva leggera</title> | |
<tgroup cols="5"> | |
<tbody> | |
<row> | |
<entry> | |
resource (a partire da PHP 7) | |
</entry> | |
<entry> | |
mixed (a partire da PHP 7) | |
</entry> | |
<entry> | |
numeric (a partire da PHP 7) | |
</entry> | |
<entry> | |
</entry> | |
</row> | |
</tbody> | |
</tgroup> | |
</table> | |
</para> | |
</sect1> | |
</appendix> | |
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