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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.strripos" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>strripos</refname>
<refpurpose>Find the position of the last occurrence of a case-insensitive substring in a string</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>int</type><type>false</type></type><methodname>strripos</methodname>
<methodparam><type>string</type><parameter>haystack</parameter></methodparam>
<methodparam><type>string</type><parameter>needle</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>offset</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
Find the numeric position of the last occurrence of
<parameter>needle</parameter> in the <parameter>haystack</parameter> string.
</para>
<para>
Unlike the <function>strrpos</function>, <function>strripos</function> is
case-insensitive.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>haystack</parameter></term>
<listitem>
<para>
The string to search in.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>needle</parameter></term>
<listitem>
<para>
The string to search for.
</para>
&strings.parameter.needle.non-string;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>offset</parameter></term>
<listitem>
<para>
If zero or positive, the search is performed left to right skipping the
first <parameter>offset</parameter> bytes of the
<parameter>haystack</parameter>.
</para>
<para>
If negative, the search is performed right to left skipping the
last <parameter>offset</parameter> bytes of the
<parameter>haystack</parameter> and searching for the first occurrence
of <parameter>needle</parameter>.
<note>
<para>
This is effectively looking for the last occurrence of
<parameter>needle</parameter> before the last
<parameter>offset</parameter> bytes.
</para>
</note>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the position where the needle exists relative to the beginnning of
the <parameter>haystack</parameter> string (independent of search direction
or offset).
<note>
<simpara>
String positions start at 0, and not 1.
</simpara>
</note>
</para>
<para>
Returns &false; if the needle was not found.
</para>
&return.falseproblem;
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&strings.changelog.ascii-case-folding;
&strings.changelog.needle-empty;
<row>
<entry>8.0.0</entry>
<entry>
Passing an &integer; as <parameter>needle</parameter> is no longer supported.
</entry>
</row>
<row>
<entry>7.3.0</entry>
<entry>
Passing an &integer; as <parameter>needle</parameter> has been deprecated.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>A simple <function>strripos</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$haystack = 'ababcd';
$needle = 'aB';
$pos = strripos($haystack, $needle);
if ($pos === false) {
echo "Sorry, we did not find ($needle) in ($haystack)";
} else {
echo "Congratulations!\n";
echo "We found the last ($needle) in ($haystack) at position ($pos)";
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Congratulations!
We found the last (aB) in (ababcd) at position (2)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>strpos</function></member>
<member><function>stripos</function></member>
<member><function>strrpos</function></member>
<member><function>strrchr</function></member>
<member><function>stristr</function></member>
<member><function>substr</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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