Extracting a parameter from a URL in WordPress

Question

I am trying to pass a parameter to a WordPress site using a URL - for instance   www fioriapts com  ppc 1 will be the URL     I am intending to write a function in the functions php file but the mechanics of how to extract a parameter in WordPress is beyond me   I am finding a lot of examples on how to add a parameter to a URL using the function add query arg   but have found nothing on how to extract a parameter   Thanks in advance for any help

User · Answer

You can try this function         Gets the request parameter         param      string   key      The query parameter     param      string   default  The default value to return if not found        return     string  The request parameter       function get request parameter   key   default                 If not request set     if     isset    REQUEST   key        empty    REQUEST   key                 return  default                Set so process it     return strip tags   string  wp unslash    REQUEST   key            Here is what is happening in the function   Here three things are happening    First we check if the request key is present or not  If not  then just return a default value  If it is set  then we first remove slashes by doing wp unslash  Read here why it is better than stripslashes deep  Then we sanitize the value by doing a simple strip tags  If you expect rich text from parameter  then run it through wp kses or similar functions    All of this information plus more info on the thinking behind the function can be found on this link https   www intechgrity com correct-way-get-url-parameter-values-wordpress

User · Answer

In the call back function  use the  request parameter   parameters    request- gt get params    echo  parameters  ppc

User · Answer

When passing parameters through the URL you re able to retrieve the values as GET parameters   Use this    variable     GET  param name       Or as you have it  ppc     GET  ppc      It is safer to check for the variable first though   if  isset   GET  ppc          ppc     GET  ppc      else       Handle the case where there is no parameter     Here s a bit of reading on GET POST params you should look at  http   php net manual en reserved variables get php  EDIT  I see this answer still gets a lot of traffic years after making it  Please read comments attached to this answer  especially input from  emc who details a WordPress function which accomplishes this goal securely

User · Answer

Why not just use the WordPress get query var   function  WordPress Code Reference    Test if the query exists at the URL if   get query var  ppc               If so echo the value     echo get query var  ppc        Since get query var can only access query parameters available to WP Query  in order to access a custom query var like  ppc   you will also need to register this query variable within your plugin or functions php by adding an action during initialization  add action  init   add get val    function add get val          global  wp        wp- gt add query var  ppc        Or by adding a hook to the query vars filter  function add query vars filter   vars       vars      quot ppc quot     return  vars    add filter   query vars    add query vars filter

[php] Extracting a parameter from a URL in WordPress

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