php - How to check which radio button a user checked if not in a form -

i have textfile information using create quiz. displaying 1 quiz question @ time however. generating radio buttons based on number of questions , have submit button after loop generates radio buttons. can't figure out how radio button user selected in $_post array when click submit. initial thought use form tag , have loop run don't know if works or how make work syntactically.

textfile (the last number index of right answer):

what charmander evolve to?#charmeleon:charizard:squirtle#0 main character in pokemon?#misty:ash:obama#1 

script:

<?php          $indextemp = intval($_session["index"]);          if($_session["numquestions"] == $indextemp){             echo "your results are: ";             echo "<form action=\"process.php\" method=\"post\"> main screen: <input type=\"submit\"><br \> </form>";             exit();         }          $filename = $_session["quizoftheday"];          $quizstuff = file($filename);         $ctr =1;           $questioninfo = $quizstuff[$indextemp];          $questionparse = explode("#", $questioninfo);         $_session["correctans"] = $questionparse[2];         echo $_session["correctans"]." line 55 <br />";         $answerchoices = explode(":",$questionparse[1]);          echo "$questionparse[0] ? <br />";         #this radio buttons being generated         foreach ($answerchoices $answerchoice) {                 echo "<input type='radio' name='ans$ctr' id='q1' value='$ctr'> <label for='q1'> $answerchoice </label> <br />";                 $ctr +=1;             }         $_session["index"] = $indextemp +1;         echo "<form action=\"questions.php\" method=\"post\"> <input type=\"submit\"><br \> </form>";       ?> 

obtaining data radio buttons , checkboxes can little tricky, due lack of understanding of how radio buttons , checkboxes work.

it important remember 2 facts:

1. checkbox "names" must unique each checkbox
2. radio button "names" must identical each group of buttons

update foreach since must have same name radio buttons different values.

<?php foreach ($answerchoices $answerchoice) { echo "<input type='radio' name='ans' id='q1' value=".$ctr."> <label for='q1'>".$answerchoice."</label> <br />"; $ctr +=1; } ?> 

now for-each concatenation looks wrong , have updated , since concatenation wrong value not displayed in radio button. radio button value count of increment variable.