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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.strncasecmp" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>strncasecmp</refname>
<refpurpose>Binary safe case-insensitive string comparison of the first n characters</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>strncasecmp</methodname>
<methodparam><type>string</type><parameter>string1</parameter></methodparam>
<methodparam><type>string</type><parameter>string2</parameter></methodparam>
<methodparam><type>int</type><parameter>length</parameter></methodparam>
</methodsynopsis>
<para>
This function is similar to <function>strcasecmp</function>, with the
difference that you can specify the (upper limit of the) number of
characters from each string to be used in the comparison.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>string1</parameter></term>
<listitem>
<para>
The first string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>string2</parameter></term>
<listitem>
<para>
The second string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
The length of strings to be used in the comparison.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns <literal>-1</literal> if <parameter>string1</parameter> is less than
<parameter>string2</parameter>; <literal>1</literal> if <parameter>string1</parameter> is
greater than <parameter>string2</parameter>, and <literal>0</literal> if they are equal.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&standard.changelog.binary-safe-string-comparison;
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>strncasecmp</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$var1 = 'Hello John';
$var2 = 'hello Doe';
if (strncasecmp($var1, $var2, 5) === 0) {
echo 'First 5 characters of $var1 and $var2 are equals in a case-insensitive string comparison';
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>strncmp</function></member>
<member><function>preg_match</function></member>
<member><function>substr_compare</function></member>
<member><function>strcasecmp</function></member>
<member><function>stristr</function></member>
<member><function>substr</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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