archived-doc-it/reference/strings/functions/trim.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
<refentry xml:id="function.trim" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>trim</refname>
  <refpurpose>Rimuove gli spazi (ed altri caratteri) all'inizio e alla fine di un testo</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>trim</methodname>
   <methodparam><type>string</type><parameter>str</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>charlist</parameter></methodparam>
  </methodsynopsis>
  <para>
   Questa funzione restituisce il parametro <parameter>str</parameter>
   privo degli spazi iniziali e finali.
   Senza la specifica del secondo parametro,
   <function>trim</function> rimuoverà questi caratteri:
   <!-- sorted by importance. Printed 3 times: trim, ltrim, rtrim -->
   <itemizedlist>
    <listitem>
     <simpara>
      " " (<acronym>ASCII</acronym> <literal>32</literal>
      (<literal>0x20</literal>)), spazio.
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\t" (<acronym>ASCII</acronym> <literal>9</literal>
      (<literal>0x09</literal>)), il carattere tab.
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\n" (<acronym>ASCII</acronym> <literal>10</literal>
      (<literal>0x0A</literal>)),  il new line (line feed).
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\r" (<acronym>ASCII</acronym> <literal>13</literal>
      (<literal>0x0D</literal>)), il carriage return.
     </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>)), il tab verticale.
     </simpara>
    </listitem>
   </itemizedlist>
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>str</parameter></term>
     <listitem>
      <para>
       La <type>stringa</type> che deve essere troncata.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>charlist</parameter></term>
     <listitem>
      <para>
       Opzionale, Si può, inoltre, specificare quali caratteri si desidera rimuovere
       elencandoli in <parameter>charlist</parameter>.
       Questo parametro è un semplice elenco dei caratteri da rimuovere. Con
       <literal>..</literal> si può indicare un range di caratteri.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   La stringa troncata.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>4.1.0</entry>
       <entry>
        E' stato aggiunto il parametro opzionale <parameter>charlist</parameter>.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Esempio di uso di <function>trim</function></title>
    <programlisting role="php">
<![CDATA[
<?php

$text = "\t\tThese are a few words :) ...  ";

echo trim($text);           // "These are a few words :) ..."
echo trim($text, " \t.");   // "These are a few words :)"

// rimuove i caratteri di controllo ASCII all'inizio ed alla fine di $binary
// (da 0 a 31 compresi)
$clean = trim($binary, "\x00..\x1F");

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Trimming array values with <function>trim</function></title>
    <programlisting role="php">
<![CDATA[
<?php
function trim_value(&$value)
{
  $value = trim($value);
}

$fruit = array('apple','banana ', ' cranberry ');
var_dump($fruit);

array_walk($fruit, 'trim_value');
var_dump($fruit);

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
array(3) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(7) "banana "
  [2]=>
  string(11) " cranberry "
}
array(3) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(6) "banana"
  [2]=>
  string(9) "cranberry"
}

]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>ltrim</function></member>
    <member><function>rtrim</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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