wordpress plugin to redirect defined url to another url option page showing

[Mr.pc.online]

i was working on a plugin that can find some special url in wordpress page contents and then if matching URL found then change that url automatically to another url like without giving backlink benfit to that site.

for example :
if i have defined a site that start with www.site2.com
and i wants to redirect this to another site www.site3.com

now pluging will convert url fount www.site.com on page to www.site.com/og.php=www.site2.com now if user clicks this url this will be redirected to www.site3.com

after inslalling and activating plugin found urls are converting but when i clicks them getting error "/og.php" file not found

And when i have tried to open option page to add more url or changing some settings on page
it's giving me error "you do not have permission to access this page"

below you can check my codes for both pages

[Mr.pc.online]

  <?php
    /*
    Author: Tasleem
    Author URI: http://www.alitips.in
    Description: Admin options for Automatic Affiliate Links on the fly
    */

    $location = get_option('siteurl') . '/wp-admin/st_auto_affiliate_links_options.php'; // Form Action URI


    // Set a few defaults to get people started and use as examples
    add_option('st_aal_before', 'http://www.hammacher.com
    http://www.thinkgeek.com
    http://www.blogrush.com');

    add_option('st_aal_after', 'http://www.dpbolvw.net/j6117p-85-7NPVWPRURNPORVORWO?url=%ENCODED_TARGET%&cm_ven=CJ&cm_cat=1511450&cm_pla=1781363&cm_ite=Hammacher+Schlemmer&sid=%TARGET%
    http://www.anrdoezrs.net/se121lnwtnvACIJCEHEACBEGHEDF?url=%ENCODED_TARGET%&sid=cg-%TARGET%
    http://www.blogrush.com/r58661417');;

    /*check form submission and update options*/
    if ('process' == $_POST['stage'])
    {
        update_option('st_aal_before', $_POST['st_aal_before']);
        update_option('st_aal_after', $_POST['st_aal_after']);
    }

    /* Get options for form fields */
    $st_aal_before = get_option('st_aal_before');
    $st_aal_after = get_option('st_aal_after');

    ?>


    <div class="wrap"> 
      <h2><?php _e('Automatic Affiliate Links Options', 'st_ts_') ?></h2> 
      <form name="form1" method="post" action="<?php echo $location ?>&amp;updated=true">
        <input type="hidden" name="stage" value="process" />
        <table width="100%" cellspacing="2" cellpadding="5" class="editform">
        <tr>
            <td width="50%" valign="top"><strong>URLs that start with</strong></td>
            <td><strong>Replace with</strong></td>
        </tr>
        <tr>
            <td valign="top"><textarea name="st_aal_before" id="st_aal_before" style="width: 95%;" rows="15" cols="50"><?php echo $st_aal_before; ?></textarea></td>
            <td valign="top"><textarea name="st_aal_after" id="st_aal_after" style="width: 95%;" rows="15" cols="50"><?php echo $st_aal_after; ?></textarea>
            <strong>Tokens:</strong><br>
            <i>%TARGET%</i> - original URL<br>
            <i>%ENCODED_TARGET%</i> - original URL encoded to be html friendly
            </td>
        </tr>
        </table>
            <p class="submit">
          <input type="submit" name="Submit" value="<?php _e('Update Options', 'st_ts_') ?> &raquo;" />
        </p>
          </form>
    </div>

[Mr.pc.online]

    <?php
    /*
    Plugin Name: Automatic Affiliate Links
    Plugin URI: http://www.alitips.in
    Author: Tasleem
    Author URI: http://www.alitips.in
    Description: Changes Affiliate URLs to local URL which will then be forwarded by the local script
    Date: September 18th, 2007
    Version: 1.1
    History:
    18/09/2007  1.0.0   Initial Version
    19/9/2007   1.0.01  Modifed (hacked) to cope with multiple ?s and &s in the initial URL

    */


    $OutGoingURL =   "/og.php";

    function ConvertURLs($aText)
    {
        global $OutGoingURL;

        $st_aal_before = get_option('st_aal_before');
        $searchfor = explode("\r\n", trim($st_aal_before));

        for($i = 0; $i < count($searchfor); $i++)
        {
            $searchfor[$i] = "|href=['\"](" . $searchfor[$i] . ".*)/?['\"]|Ui";
        }

        get_option('siteurl');
        $aText = preg_replace($searchfor, "href='" . get_option('siteurl'). "$OutGoingURL?url=$1" ."'", $aText);    
        return $aText;
    }


    if(strstr( $_SERVER['REQUEST_URI'], $OutGoingURL))
    {
        $st_aal_after = get_option('st_aal_after');
        $replacewith = explode("\r\n", trim($st_aal_after));

        $st_aal_before = get_option('st_aal_before');
        $searchfor = explode("\r\n", trim($st_aal_before));
        for($i = 0; $i < count($searchfor); $i++)
        {
            $searchfor[$i] = "|(" . $searchfor[$i] . ").*|Ui";
        }

        $lURL = $_SERVER['QUERY_STRING'];
        // Bit of a hack, the query string may have multiple ? and & so just knock the url= bit off the querystring
        $lURL = substr($lURL, 4, strlen($lURL));
        $lNewURL = preg_replace($searchfor, $replacewith, $lURL);   
        $lNewURL = str_replace("%TARGET%", $lURL, $lNewURL);;
        $lNewURL = str_replace("%ENCODED_TARGET%", urlencode($lURL), $lNewURL);;

        header("location: $lNewURL"); 
        exit;
    }


    function st_affiliate_links_options_page()
    {
        add_options_page('Automatic Affiliate Links Options', 'Automatic Affiliate Links', 9, 'st_auto_affiliate_links_options.php');
    }


    if (function_exists('add_action') && function_exists('add_filter')) 
    {
        add_action('admin_head', 'st_affiliate_links_options_page');
        add_filter('the_content', 'ConvertURLs', 1);
    }
    ?>

[LastMitch]

it's giving me error "you do not have permission to access this page"

The error means you don't have permission from the admin side.

Another words there's nothing wrong with the code it's means that you didn't configure plugin permission in the beginning for this plugin to function/work.

[Mr.pc.online]

how to resolve the permission issue....?

[LastMitch]

how to resolve the permission issue....?

I didn't expect you to say that because it's on the WordPress platform. I can't believe you are creating a plugin and not know where to set the permission?

Here is the link:

http://codex.wordpress.org/Changing_File_Permissions

[Mr.pc.online]

on Local host

Fatal error: Call to undefined function get_option() in D:\wordpress\InstantWP_4.1\iwpserver\htdocs\wordpress\wp-admin\st_auto_affiliate_links_options.php on line 8

on online hosted site getting

http://tech2day.asia/wp-admin/options-general.php?page=st_auto_affiliate_links_options.php
You do not have sufficient permissions to access this page.

you can check my test site: http://tech2day.asia/wp-admin
username Admin
password PdIQ18Lky0