If you are running the script on IIS on windows based hosting then you may encounter URL re-writing error to avoide any windows re-writing errors please create file on your root folder with name ( WEB.CONFIG ) and paste the below provided code into newly created file :
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<handlers>
<remove name="CGI-exe" />
<add name="CGI-exe" path="*.exe" verb="*" modules="CgiModule" scriptProcessor="C:\php\php-cgi.exe" resourceType="File" requireAccess="Execute" allowPathInfo="true" />
</handlers>
<rewrite>
<rules>
<rule name="block favicon" stopProcessing="true">
<match url="favicon\.ico" />
<action type="CustomResponse" statusCode="404" subStatusCode="1"
statusReason="The requested file favicon.ico was not found"
statusDescription="The requested file favicon.ico was not found" />
</rule>
<rule name="Imported Rule 1" stopProcessing="true">
<match url="^(.*)$" ignoreCase="false" />
<conditions>
<add input="{HTTP_HOST}" pattern="^example\.com$" />
</conditions>
<action type="Redirect" redirectType="Permanent" url="http://www.example.com/{R:1}" />
</rule>
<rule name="Imported Rule 2" stopProcessing="true">
<match url="^(.*)$" ignoreCase="false" />
<conditions>
<add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />
<add input="{URL}" pattern="^/favicon.ico$" ignoreCase="false" negate="true" />
</conditions>
<action type="Rewrite" url="index.php?q={R:1}" appendQueryString="true" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>