php-doc-en/reference/strings/functions/substr-replace.xml

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<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;
  &note.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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