php - Updating from Null to something and vice versa through IF/ELSEIF/ELSE? -

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i making php script use if/elseif/else statement. have table column null(empty) field , trying store column when user decides not click submit button , clear column field when user submits. $field storing specific column.

if($field == null) {     $sql = mysqli_query("update table set = 'something' id='1'");         if(isset($_post["x"])) {              $sql = mysqli_query("update table set = null id='1'");         } else {             echo "null1 error";         } } elseif (!empty($field)) {     if(isset($_post["x"])) {          $sql = mysqli_query($db_conx, "update table set = null id='1'");     } else {         echo "null2 error";     }     } else {     echo 'error'; }

the problem while want @ end $_post happens elseif statement , if don't refresh page(to test) , hit submit button $_post comes if statement. doing wrong here? ps: more specific on doing user gets form/details needs submit. don't want him bypass without submission storing database until submits info. if refresh page or visit page after month same form until submit info.


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