HOW check if exist some page slug ???

[angelo]

To check page exist you can use global $pagesArray variable, it contains cached page data:

Code:

global $pagesArray;
if(isset($pagesArray[$slug])) echo 'Page exist';
else echo 'Page does not exist';

Another, quicker option would be to check it manually with native file_exist() PHP method, for example:

Code:

if(file_exists(GSDATAPAGESPATH.$slug.'.xml')) echo 'Page exist';
else echo 'Page does not exist';

PS. Do not forget to sanitize the user input!

Nice solution  
I use this for my template functions.php  
Thank you.