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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.substr-replace">
<refnamediv>
<refname>substr_replace</refname>
<refpurpose>Replace text within a portion of a string</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>mixed</type><methodname>substr_replace</methodname>
<methodparam><type>mixed</type><parameter>string</parameter></methodparam>
<methodparam><type>string</type><parameter>replacement</parameter></methodparam>
<methodparam><type>int</type><parameter>start</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
</methodsynopsis>
<para>
<function>substr_replace</function> replaces a copy of
<parameter>string</parameter> delimited by the
<parameter>start</parameter> and (optionally)
<parameter>length</parameter> parameters with the string given in
<parameter>replacement</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>string</parameter></term>
<listitem>
<para>
The input string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>replacement</parameter></term>
<listitem>
<para>
The replacement string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>start</parameter></term>
<listitem>
<para>
If <parameter>start</parameter> is positive, the replacing will
begin at the <parameter>start</parameter>'th offset into
<parameter>string</parameter>.
</para>
<para>
If <parameter>start</parameter> is negative, the replacing will
begin at the <parameter>start</parameter>'th character from the
end of <parameter>string</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
If given and is positive, it represents the length of the portion of
<parameter>string</parameter> which is to be replaced. If it is
negative, it represents the number of characters from the end of
<parameter>string</parameter> at which to stop replacing. If it
is not given, then it will default to strlen(
<parameter>string</parameter> ); i.e. end the replacing at the
end of <parameter>string</parameter>. Of course, if
<parameter>length</parameter> is zero then this function will have the
effect of inserting <parameter>replacement</parameter> into
<parameter>string</parameter> at the given
<parameter>start</parameter> offset.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The result string is returned. If <parameter>string</parameter> is an
array then array is returned.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>substr_replace</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$var = 'ABCDEFGH:/MNRPQR/';
echo "Original: $var<hr />\n";
/* These two examples replace all of $var with 'bob'. */
echo substr_replace($var, 'bob', 0) . "<br />\n";
echo substr_replace($var, 'bob', 0, strlen($var)) . "<br />\n";
/* Insert 'bob' right at the beginning of $var. */
echo substr_replace($var, 'bob', 0, 0) . "<br />\n";
/* These next two replace 'MNRPQR' in $var with 'bob'. */
echo substr_replace($var, 'bob', 10, -1) . "<br />\n";
echo substr_replace($var, 'bob', -7, -1) . "<br />\n";
/* Delete 'MNRPQR' from $var. */
echo substr_replace($var, '', 10, -1) . "<br />\n";
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.bin-safe;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>str_replace</function></member>
<member><function>substr</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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