php-doc-en/reference/pcre/functions/preg-split.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.15 $ -->
<refentry xml:id="function.preg-split" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>preg_split</refname>
  <refpurpose>Split string by a regular expression</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>preg_split</methodname>
   <methodparam><type>string</type><parameter>pattern</parameter></methodparam>
   <methodparam><type>string</type><parameter>subject</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>limit</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter></methodparam>
  </methodsynopsis>
  <para>
   Split the given string by a regular expression.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>pattern</parameter></term>
     <listitem>
      <para>
       The pattern to search for, as a string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>subject</parameter></term>
     <listitem>
      <para>
       The input string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>limit</parameter></term>
     <listitem>
      <para>
       If specified, then only substrings up to <parameter>limit</parameter>
       are returned, and if <parameter>limit</parameter> is -1, it actually
       means "no limit", which is useful for specifying the
       <parameter>flags</parameter>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       <parameter>flags</parameter> can be any combination of the following
       flags (combined with bitwise | operator):
       <variablelist>
        <varlistentry>
         <term><constant>PREG_SPLIT_NO_EMPTY</constant></term>
         <listitem>
          <simpara>
          If this flag is set, only non-empty pieces will be returned by
          <function>preg_split</function>.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><constant>PREG_SPLIT_DELIM_CAPTURE</constant></term>
         <listitem>
          <simpara>
          If this flag is set, parenthesized expression in the delimiter pattern
          will be captured and returned as well.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><constant>PREG_SPLIT_OFFSET_CAPTURE</constant></term>
         <listitem>
          <para>
           If this flag is set, for every occurring match the appendant string
           offset will also be returned. Note that this changes the return
           value in an array where every element is an array consisting of the
           matched string at offset <literal>0</literal> and its string offset
           into <parameter>subject</parameter> at offset <literal>1</literal>.
          </para>
         </listitem>
        </varlistentry>
       </variablelist>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array containing substrings of <parameter>subject</parameter>
   split along boundaries matched by <parameter>pattern</parameter>.
  </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>4.3.0</entry>
       <entry>
        The <constant>PREG_SPLIT_OFFSET_CAPTURE</constant> was added
       </entry>
      </row>
      <row>
       <entry>4.0.5</entry>
       <entry>
        The <constant>PREG_SPLIT_DELIM_CAPTURE</constant> was added
       </entry>
      </row>
      <row>
       <entry>4.0.0</entry>
       <entry>
        The <parameter>flags</parameter> parameter was added
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>preg_split</function> example : Get the parts of a search string</title>
    <programlisting role="php">
<![CDATA[
<?php
// split the phrase by any number of commas or space characters,
// which include " ", \r, \t, \n and \f
$keywords = preg_split("/[\s,]+/", "hypertext language, programming");
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Splitting a string into component characters</title>
    <programlisting role="php">
<![CDATA[
<?php
$str = 'string';
$chars = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
print_r($chars);
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Splitting a string into matches and their offsets</title>
    <programlisting role="php">
<![CDATA[
<?php
$str = 'hypertext language programming';
$chars = preg_split('/ /', $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
print_r($chars);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => Array
        (
            [0] => hypertext
            [1] => 0
        )

    [1] => Array
        (
            [0] => language
            [1] => 10
        )

    [2] => Array
        (
            [0] => programming
            [1] => 19
        )

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

 <refsect1 role="notes">
  &reftitle.notes;
  <tip>
   <para>
    If you don't need the power of regular expressions, you can choose
    faster (albeit simpler) alternatives like <function>explode</function>
    or <function>str_split</function>.
   </para>
  </tip>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>spliti</function></member>
    <member><function>split</function></member>
    <member><function>implode</function></member>
    <member><function>preg_match</function></member>
    <member><function>preg_match_all</function></member>
    <member><function>preg_replace</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:"../../../../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
-->