粘性选择选项

Question

I have the following PHP code:

<?php

echo '<select name="transact_day" id="transact_day">';

echo"<option value=''>Select Day</option>";

for($i= 1; $i<=31; $i++){
    echo "<option value=". $i ." ";

      if(isset($day) == "$i"){
                echo 'selected = "selected" ';
      }

   echo ">$i</option>
";
}
echo '</select>';

?>

I want it to be sticky but when a date is selected (e.g 10) and the form is submitted it's only the value 31 that is sticky (irrespective of the selected date). I have tried different options, searched through similar questions but I couldn't figure out what was wrong with the above code. Any suggestion? Thank

Answer 1

isset($day) returns a boolean value, so comparing this to $i is incorrect. Check if $day is set, then compare $day with $i:

echo '<select name="transact_day" id="transact_day">';

         echo"<option value=''>Select Day</option>";

           for($i= 1; $i<=31; $i++){
            echo "<option value=". $i ." ";

            if(isset($day) && ($day == "$i")){
                echo 'selected = "selected" ';
            }

            echo ">$i</option>
";
         }
         echo '</select>';