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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@78496 c90b9560-bf6c-de11-be94-00142212c4b1
132 lines
4.5 KiB
XML
132 lines
4.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.2 $ -->
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<!-- splitted from ./en/functions/regex.xml, last change in rev 1.7 -->
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<refentry id="function.split">
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<refnamediv>
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<refname>split</refname>
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<refpurpose>split string into array by regular expression</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>array</type><methodname>split</methodname>
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<methodparam><type>string</type><parameter>pattern</parameter></methodparam>
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<methodparam><type>string</type><parameter>string</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>limit</parameter></methodparam>
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</methodsynopsis>
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<note>
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<para>
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<function>preg_split</function>, which uses a Perl-compatible
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regular expression syntax, is often a faster alternative to
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<function>split</function>.
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</para>
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</note>
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<para>
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Returns an array of strings, each of which is a substring of
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<parameter>string</parameter> formed by splitting it on
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boundaries formed by the regular expression
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<parameter>pattern</parameter>. If <parameter>limit</parameter>
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is set, the returned array will contain a maximum of
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<parameter>limit</parameter> elements with the last element
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containing the whole rest of <parameter>string</parameter>. If
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an error occurs, <function>split</function> returns &false;.
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</para>
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<para>
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To split off the first four fields from a line from
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<filename>/etc/passwd</filename>:
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<example>
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<title><function>split</function> Example</title>
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<programlisting role="php">
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<![CDATA[
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list($user,$pass,$uid,$gid,$extra)= split (":", $passwd_line, 5);
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]]>
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</programlisting>
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</example>
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</para>
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<note>
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<simpara>
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If there are <replaceable>n</replaceable> occurrences of
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<parameter>pattern</parameter>, the returned array will contain
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<literal><replaceable>n</replaceable>+1</literal> items. For example, if
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there is no occurrence of <parameter>pattern</parameter>, an array with
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only one element will be returned. Of course, this is also true if
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<parameter>string</parameter> is empty.
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</simpara>
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</note>
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<para>
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To parse a date which may be delimited with slashes, dots, or
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hyphens:
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<example>
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<title><function>split</function> Example</title>
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<programlisting role="php">
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<![CDATA[
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$date = "04/30/1973"; // Delimiters may be slash, dot, or hyphen
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list ($month, $day, $year) = split ('[/.-]', $date);
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echo "Month: $month; Day: $day; Year: $year<br>\n";
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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Note that <parameter>pattern</parameter> is case-sensitive.
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</para>
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<para>
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Note that if you don't require the power of regular expressions,
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it is faster to use <function>explode</function>, which doesn't
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incur the overhead of the regular expression engine.
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</para>
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<para>
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For users looking for a way to emulate Perl's <command>@chars =
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split('', $str)</command> behaviour, please see the examples for
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<function>preg_split</function>.
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</para>
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<para>
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Please note that <parameter>pattern</parameter> is a regular
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expression. If you want to split on any of the characters which
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are considered special by regular expressions, you'll need to
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escape them first. If you think <function>split</function> (or
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any other regex function, for that matter) is doing something
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weird, please read the file <filename>regex.7</filename>,
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included in the <filename>regex/</filename> subdirectory of the
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PHP distribution. It's in manpage format, so you'll want to do
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something along the lines of <command>man
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/usr/local/src/regex/regex.7</command> in order to read it.
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</para>
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<para>
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See also:
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<function>preg_split</function>,
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<function>spliti</function>,
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<function>explode</function>,
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<function>implode</function>,
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<function>chunk_split</function>, and
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<function>wordwrap</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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