php-doc-en/reference/strings/functions/rtrim.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.rtrim">
 <refnamediv>
  <refname>rtrim</refname>
  <refpurpose>Strip whitespace (or other characters) from the end of a string</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>rtrim</methodname>
   <methodparam><type>string</type><parameter>str</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>charlist</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function returns a string with whitespace stripped from the
   end of <parameter>str</parameter>.
  </para>
  <para>
   Without the second parameter,
   <function>rtrim</function> will strip these characters:
   <!-- sorted by importance. Printed 3 times: trim, ltrim, rtrim -->
   <itemizedlist>
    <listitem>
     <simpara>
      " " (<acronym>ASCII</acronym> <literal>32</literal>
      (<literal>0x20</literal>)), an ordinary space.
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\t" (<acronym>ASCII</acronym> <literal>9</literal>
      (<literal>0x09</literal>)), a tab.
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\n" (<acronym>ASCII</acronym> <literal>10</literal>
      (<literal>0x0A</literal>)), a new line (line feed).
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\r" (<acronym>ASCII</acronym> <literal>13</literal>
      (<literal>0x0D</literal>)), a carriage return.
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      "\0" (<acronym>ASCII</acronym> <literal>0</literal>
      (<literal>0x00</literal>)), the <literal>NUL</literal>-byte.
     </simpara>
    </listitem>
    <listitem>
     <simpara> <!-- not \v, since not supported by PHP -->
      "\x0B" (<acronym>ASCII</acronym> <literal>11</literal>
      (<literal>0x0B</literal>)), a vertical tab.
     </simpara>
    </listitem>
   </itemizedlist>
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>str</parameter></term>
     <listitem>
      <para>
       The input string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>charlist</parameter></term>
     <listitem>
      <para>
       You can also specify the characters you want to strip, by means
       of the <parameter>charlist</parameter> parameter.
       Simply list all characters that you want to be stripped. With
       <literal>..</literal> you can specify a range of characters.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the modified string.
  </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>
        The <parameter>charlist</parameter> parameter was added.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Usage example of <function>rtrim</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";

$trimmed = rtrim($text);
var_dump($trimmed);

$trimmed = rtrim($text, " \t.");
var_dump($trimmed);

$trimmed = rtrim($hello, "Hdle");
var_dump($trimmed);

// trim the ASCII control characters at the end of $binary
// (from 0 to 31 inclusive)
$clean = rtrim($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(26) "        These are a few words :)"
string(9) "Hello Wor"
string(15) "    Example string"
]]>
    </screen>
   </example>   
  </para>
 </refsect1>

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

</refentry>

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