<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.2 $ -->
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  <refentry id="function.substr-replace">
   <refnamediv>
    <refname>substr_replace</refname>
    <refpurpose>Replace text within a portion of a string</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>substr_replace</methodname>
      <methodparam><type>string</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>. The result is returned.
    </para>
    <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>
    <para>
     If <parameter>length</parameter> is 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>.
    </para>
    <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>
    <para>
     See also <function>str_replace</function> and
     <function>substr</function>.
    </para>
   </refsect1>
  </refentry>

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