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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Replace text within a portion of a string</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.substr-count.html">substr_count</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.substr.html">substr</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.substr-replace" class="refentry"> <div class="refnamediv">  <h1 class="refname">substr_replace</h1>  <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">substr_replace</span> &mdash; <span class="dc-title">Replace text within a portion of a string</span></p> </div>  <div class="refsect1 description">  <h3 class="title">Description</h3>  <div class="methodsynopsis dc-description">   <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><b><b>substr_replace</b></b></span>    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$string</tt></span>   , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$replacement</tt></span>   , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$start</tt></span>   [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$length</tt></span>  ] )</div>  <p class="para rdfs-comment">   <b>substr_replace()</b> replaces a copy of   <i><tt class="parameter">string</tt></i> delimited by the   <i><tt class="parameter">start</tt></i> and (optionally)   <i><tt class="parameter">length</tt></i> parameters with the string given in   <i><tt class="parameter">replacement</tt></i>.   </p> </div> <div class="refsect1 parameters">  <h3 class="title">Parameters</h3>  <p class="para">   <dl>    <dt>     <span class="term"><i><tt class="parameter">string</tt></i></span>     <dd>      <p class="para">       The input string.      </p>     </dd>    </dt>    <dt>     <span class="term"><i><tt class="parameter">replacement</tt></i></span>     <dd>      <p class="para">       The replacement string.      </p>     </dd>    </dt>    <dt>     <span class="term"><i><tt class="parameter">start</tt></i></span>     <dd>      <p class="para">       If <i><tt class="parameter">start</tt></i> is positive, the replacing will       begin at the <i><tt class="parameter">start</tt></i>&#039;th offset into       <i><tt class="parameter">string</tt></i>.      </p>      <p class="para">       If <i><tt class="parameter">start</tt></i> is negative, the replacing will       begin at the <i><tt class="parameter">start</tt></i>&#039;th character from the       end of <i><tt class="parameter">string</tt></i>.      </p>     </dd>    </dt>    <dt>     <span class="term"><i><tt class="parameter">length</tt></i></span>     <dd>      <p class="para">       If given and is positive, it represents the length of the portion of       <i><tt class="parameter">string</tt></i> which is to be replaced. If it is       negative, it represents the number of characters from the end of       <i><tt class="parameter">string</tt></i> at which to stop replacing. If it       is not given, then it will default to strlen(       <i><tt class="parameter">string</tt></i> ); i.e. end the replacing at the       end of <i><tt class="parameter">string</tt></i>. Of course, if       <i><tt class="parameter">length</tt></i> is zero then this function will have the       effect of inserting <i><tt class="parameter">replacement</tt></i> into       <i><tt class="parameter">string</tt></i> at the given       <i><tt class="parameter">start</tt></i> offset.      </p>     </dd>    </dt>   </dl>  </p> </div> <div class="refsect1 returnvalues">  <h3 class="title">Return Values</h3>  <p class="para">   The result string is returned. If <i><tt class="parameter">string</tt></i> is an   array then array is returned.  </p> </div> <div class="refsect1 examples">  <h3 class="title">Examples</h3>  <p class="para">   <div class="example">    <p><b>Example #1 <b>substr_replace()</b> example</b></p>    <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$var&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'ABCDEFGH:/MNRPQR/'</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #DD0000">"Original:&nbsp;$var&lt;hr&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;These&nbsp;two&nbsp;examples&nbsp;replace&nbsp;all&nbsp;of&nbsp;$var&nbsp;with&nbsp;'bob'.&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bob'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bob'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;Insert&nbsp;'bob'&nbsp;right&nbsp;at&nbsp;the&nbsp;beginning&nbsp;of&nbsp;$var.&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bob'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;These&nbsp;next&nbsp;two&nbsp;replace&nbsp;'MNRPQR'&nbsp;in&nbsp;$var&nbsp;with&nbsp;'bob'.&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bob'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bob'</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">7</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;Delete&nbsp;'MNRPQR'&nbsp;from&nbsp;$var.&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">''</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>    </div>   </div>  </p> </div> <div class="refsect1 notes">  <h3 class="title">Notes</h3>  <blockquote><p><b class="note">Note</b>: <span class="simpara">This function isbinary-safe.</span></p></blockquote> </div> <div class="refsect1 seealso">  <h3 class="title">See Also</h3>  <p class="para">   <ul class="simplelist">    <li class="member"><a href="function.str-replace.html" class="function" rel="rdfs-seeAlso">str_replace()</a></li>    <li class="member"><a href="function.substr.html" class="function" rel="rdfs-seeAlso">substr()</a></li>   </ul>  </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.substr-count.html">substr_count</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.substr.html">substr</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>
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