PHP 'copy' not working

Can anybody tell me why this function isn't copying the file at all?

$pluginfile = get_bloginfo('template_url') . '/wp-content/plugi开发者_JAVA百科ns/supersqueeze/supersqueeze.php';

$urlparts = get_bloginfo('template_url');
$homeurl = home_url();
$urlstrip = str_replace($homeurl, '..', $urlparts);
$urldest = $urlstrip . '/supersqueeze.php';

function copyemz(){ 
global $pluginfile; global $urldest;
if(!@copy($pluginfile,$urldest)) {
        $errors= error_get_last();

    }
}

This file is run from /public_html/wp-admin/plugins.php

I need it to copy the file at ($pluginfile) /public_html/wp-content/plugins/supersqueeze/supersqueeze.php

to ($urldest) /public_html/wp-content/themes/[active wordpress theme] - of course replacing [active wordpress theme] with the directory of the theme.

You need to ensure that you have write permissions to /public_html/wp-content/themes/[active wordpress theme] as well as any other files you may be overwriting.

So, the second parameter to copy() must be a local file. Make sure it is also a writable destination (chmod) like webbiedave said.

$desturl = "./supersqueeze.php";

The reason is two-fold. PHPs http stream wrappers don't support POSTing or PUTing files, which a write-to action would require. Second, your webserver probably wouldn't support HTTP PUT either. (Though a small requesthandler script could handle such.)