Isset addr()

From Hak5

Isset_address() is a function that checks the URI for bar-set variables. It either detects any variable or one specified by the coder.

Instructions

For any variable: Use the "*" flag. Do not forget the quotation marks. For a specific variable: Use the variable name, omitting the $ sign. Right now, you can not check for many specific variables in one call of the function. Although an array may work, it has not been tested.

Code

<?PHP
/**********************************************/
/*Adresse-set variable Checker                */
/*By Maxime Rousseau aka Max302               */
/*http://www.maximerousseau.com/              */
/*--------------------------------------------*/
/*Checks the addresse bar of the              */
/*current page for your choice of             */
/*a variable of your choice or any            */
/*var at all.                                 */
/*Liscensed under BeerWare.                   */
/*----http://en.wikipedia.org/wiki/Beerware---*/
/**********************************************/
 
function isset_addr($vartocheck)
 {
  $addr = $_SERVER['REQUEST_URI'];
  if ($vartocheck == "*")               //Checks any addresse set variable.
   {
    $check = stripos($addr,"?");          //Checks adresse for the php addresse line declaration character.
    if ($check >= 1)
     {
      return(1);
     } 
    else
     {
      return(0);
     }
   }
  else if ($vartocheck != 0 && $vartocheck != "*")     //Checks if the var to check is set, then proceeds to processing check
   {
    $vartocheckwq = "?".$vartocheck;               //Adds "?" for check Ex.: "/page.php?var=foo" returns 1 because "?var" is found
    $vartocheckwa = "&".$vartocheck;               //Adds "&" for check Ex.: "/page.php?var=foo&bar=some" returns 1 because 
    $checkwq = stripos($addr,$vartocheckwq);          //Checks adresse for the php addresse line declaration character.
    $checkws = stripos($addr,$vartocheckwa);          
    if ($checkwq >= 1 || $checkwa >= 1)               //If any of the stripos() checks are positive.   
     {
      return(1);
     } 
    else
     {
      return(0);
     }
   }
  else
   {
    echo "<b>PHP Error:</b> Not enough variables supplied for function <b>ISSET_ADDR()</b>";     //Error message if no var-check flag is declared
   }
 }
?>

Usage

For any of your open source work, please leave the header intact. This is licensed under beerware.