php - submit form only on button click not on page refresh -


below code, , working fine.. problem when refresh page , execute success query. 

<form action="" method="post"> <input type="submit" value="purchase" id="btn" name="link_credits"> </form>  if(isset($_request['link_credits']))  { echo "success"; //some codes here sql statements } else  {  echo " please try again tomorrow";  }  ?>

problem:

i don't want run query page refresh, should run code @ button click.

just add line unset($_request['link_credits']); in success loop 

if(isset($_request['link_credits']))      {     echo "success";     //some codes here sql statements      if($success){     $_session['msg']="data added successfully";     }     else{     $_session['msg']="data not added successfully.please check";     }     unset($_request['link_credits']);     header("location:--somepage.php--");         }     else      {      echo " please try again tomorrow";      }

then can show $_session['msg'] value in --somepage.php-- , after showing use unset($_session['msg']);


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