mirror of
https://github.com/sigmasternchen/php-doc-en
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5730e7a2fa
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@273648 c90b9560-bf6c-de11-be94-00142212c4b1
144 lines
3.7 KiB
XML
144 lines
3.7 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.18 $ -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.strrpos">
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<refnamediv>
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<refname>strrpos</refname>
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<refpurpose>Find position of last occurrence of a char in a string</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>int</type><methodname>strrpos</methodname>
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<methodparam><type>string</type><parameter>haystack</parameter></methodparam>
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<methodparam><type>string</type><parameter>needle</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>offset</parameter><initializer>0</initializer></methodparam>
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</methodsynopsis>
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<para>
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Returns the numeric position of the last occurrence of
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<parameter>needle</parameter> in the
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<parameter>haystack</parameter> string. Note that the needle in
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this case can only be a single character in PHP 4. If a string is passed
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as the needle, then only the first character of that string will
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be used.
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</para>
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<para>
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If <parameter>needle</parameter> is not found, returns &false;.
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</para>
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<para>
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It is easy to mistake the return values for "character found at
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position 0" and "character not found". Here's how to detect
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the difference:
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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// in PHP 4.0.0 and newer:
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$pos = strrpos($mystring, "b");
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if ($pos === false) { // note: three equal signs
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// not found...
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}
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// in versions older than 4.0.0:
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$pos = strrpos($mystring, "b");
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if (is_bool($pos) && !$pos) {
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// not found...
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}
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?>
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]]>
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</programlisting>
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</informalexample>
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</para>
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<para>
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If <parameter>needle</parameter> is not a string, it is converted
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to an integer and applied as the ordinal value of a character.
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</para>
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<note>
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<simpara>
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As of PHP 5.0.0 <parameter>offset</parameter> may
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be specified to begin searching an arbitrary number of characters into
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the string. Negative values will stop searching at an arbitrary point
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prior to the end of the string.
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</simpara>
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</note>
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<note>
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<simpara>
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The <parameter>needle</parameter> may be a string of more than one
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character as of PHP 5.0.0.
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</simpara>
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</note>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>haystack</parameter></term>
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<listitem>
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<para>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>needle</parameter></term>
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<listitem>
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<para>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>offset</parameter></term>
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<listitem>
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<para>
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>strpos</function></member>
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<member><function>strripos</function></member>
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<member><function>strrchr</function></member>
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<member><function>substr</function></member>
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<member><function>stristr</function></member>
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<member><function>strstr</function></member>
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</simplelist>
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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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