rename file in php
<p>I want to rename <code>picture</code> filename (without extension) to <code>old.jpg</code> from this code.</p>

<p>I have <code>picture</code> file in parent directory and the path is correctly</p>

<pre><code>$old="picture";
$new="old.jpg";
rename($old , $new);
</code></pre>

<p>or this codes</p>

<pre><code>$old="\picture";
$new="\old.jpg";
rename($old , $new);

$old="../picture";
$new="../old.jpg";
rename($old , $new);

$old="../picture";
$new="old.jpg";
rename($old , $new);

$old="./picture";
$new="./old.jpg";
rename($old , $new);

rename("picture", "old.jpg");
</code></pre>

<p>But I get this error:</p>

<pre><code> Warning: rename(picture,old.jpg) [function.rename]: The system cannot find the file specified. (code: 2) in C:\xampp\htdocs\prj\change.php on line 21
</code></pre>
