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ltrim.xml
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182 lines (166 loc) · 4.66 KB
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<?xml version="1.0" encoding="UTF-8"?>
<!-- EN-Revision: 8b5940cadeb4f1c8492f4a7f70743a2be807cf39 Maintainer: pastore Status: ready -->
<!-- CREDITS: darvina -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.ltrim">
<refnamediv>
<refname>ltrim</refname>
<refpurpose>Rimuove gli spazi (o altri caratteri) dall'inizio di una stringa</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>ltrim</methodname>
<methodparam><type>string</type><parameter>str</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>character_mask</parameter></methodparam>
</methodsynopsis>
<para>
Rimuove gli spazi (o altri caratteri) dall'inizio di una stringa
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>str</parameter></term>
<listitem>
<para>
La stringa di input.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>character_mask</parameter></term>
<listitem>
<para>
Si possono anche specificare i caratteri che si vogliono eliminare, mediante il
parametro <parameter>character_mask</parameter>.
È sufficiente elencare tutti i caratteri che vogliono essere eliminati. Con
<literal>..</literal> si può specificare un intervallo di caratteri.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Questa funzione restituisce una stringa con gli spazi eliminati dall'inzio
della <parameter>str</parameter>.
Senza il secondo parametro,
<function>ltrim</function> eliminerà questi caratteri:
<!-- sorted by importance. Printed 3 times: trim, ltrim, rtrim -->
<itemizedlist>
<listitem>
<simpara>
" " (<acronym>ASCII</acronym> <literal>32</literal>
(<literal>0x20</literal>)), uno spazio ordinario.
</simpara>
</listitem>
<listitem>
<simpara>
"\t" (<acronym>ASCII</acronym> <literal>9</literal>
(<literal>0x09</literal>)), una tabulazione.
</simpara>
</listitem>
<listitem>
<simpara>
"\n" (<acronym>ASCII</acronym> <literal>10</literal>
(<literal>0x0A</literal>)), una nuova linea (line feed).
</simpara>
</listitem>
<listitem>
<simpara>
"\r" (<acronym>ASCII</acronym> <literal>13</literal>
(<literal>0x0D</literal>)), un ritorno a capo.
</simpara>
</listitem>
<listitem>
<simpara>
"\0" (<acronym>ASCII</acronym> <literal>0</literal>
(<literal>0x00</literal>)), il byte <literal>NUL</literal>.
</simpara>
</listitem>
<listitem>
<simpara> <!-- not \v, since not supported by PHP -->
"\x0B" (<acronym>ASCII</acronym> <literal>11</literal>
(<literal>0x0B</literal>)), una tab verticale.
</simpara>
</listitem>
</itemizedlist>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Esempio d'uso di <function>ltrim</function></title>
<programlisting role="php">
<![CDATA[
<?php
$text = "\t\tThese are a few words :) ... ";
$binary = "\x09Example string\x0A";
$hello = "Hello World";
var_dump($text, $binary, $hello);
print "\n";
$trimmed = ltrim($text);
var_dump($trimmed);
$trimmed = ltrim($text, " \t.");
var_dump($trimmed);
$trimmed = ltrim($hello, "Hdle");
var_dump($trimmed);
// elimina i caratteri di controllo ASCII all'inizio di $binary
// (da 0 a 31 compreso)
$clean = ltrim($binary, "\x00..\x1F");
var_dump($clean);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
string(32) " These are a few words :) ... "
string(16) " Example string
"
string(11) "Hello World"
string(30) "These are a few words :) ... "
string(30) "These are a few words :) ... "
string(7) "o World"
string(15) "Example string
"
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>trim</function></member>
<member><function>rtrim</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->