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Editorial Team
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Asked: 2026-05-13T17:34:12+00:00

I try to update the data making use of checkboxes. But when one or

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I try to update the data making use of checkboxes. But when one or more of the checkboxes is not checked, a notice is returned:

Notice: Undefined index: stats2 in E:\wamp\www\HOSPITAL\update.php on line 12

Notice: Undefined index: stats3 in E:\wamp\www\HOSPITAL\update.php on line 12

Notice: Undefined index: stats5 in E:\wamp\www\HOSPITAL\update.php on line 12

<?php
    $con = mysql_connect("localhost","root","");
    if (!$con)
      {
      die('Could not connect: ' . mysql_error());
      }

    mysql_select_db("Hospital", $con);




       mysql_query("UPDATE t2 SET HOSPNUM ='$_POST[hnum]', ROOMNUM='$_POST[rnum]', ADDATE= '$_POST[ad8]', ADTIME='$_POST[adtym]', LASTNAME='$_POST[lname]', FIRSTNAME='$_POST[fname]', MIDNAME='$_POST[mname]', CSTAT='$_POST[cs]', AGE='$_POST[age]', BDAY='$_POST[bday]', ADDRESS='$_POST[ad]', SEX='$_POST[sex]', 
                                                                                                                                                                                                                                                                                                               STAT='$_POST[stats1]', STAT2='$_POST[stats2]', STAT3='$_POST[stats3]', STAT4='$_POST[stats4]', STAT5='$_POST[stats5]', STAT6='$_POST[stats6]', STAT7='$_POST[stats8]', STAT8='$_POST[stats8]', NURSE='$_POST[nurse]'              
        WHERE TELNUM ='$_POST[telnum]'");



    mysql_close($con)
    ?>

Could you help me, so that the notice would not show up?

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1 Answer

  1. Editorial Team

    This is the defined behavoir for checkboxes – only when set are they included in the form data.

    You should use isset() to determine if the checkbox is ticked.

    change it to

    STAT='".isset($_POST['stats1']).", 
STAT2='".isset($_POST['stats2']).", 
STAT3='".isset($_POST['stats3']).", 
STAT4='".isset($_POST['stats4']).",  
STAT5='".isset($_POST['stats5']).", 
STAT6='".isset($_POST['stats6']).", 
STAT7='".isset($_POST['stats8']).", 
STAT8='".isset($_POST['stats8'])."

    Another workaround which works is to add a hidden variable, with the same name, before the checkbox: e.g.

    <form action='t1.php' method='post'>
<input type='hidden' name="cb1" value="0">
<input type='checkbox' name="cb1" title='test'>
<input type='submit'  >
</form>
<?php 
print_r($_POST);
?>
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