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Asked: 2026-06-18T06:58:34+00:00

I have a php code where data from my database are fetched in an

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I have a php code where data from my database are fetched in an array with checkbox corresponding each data . I already have the codes enabling updates to my table (for each data checked):

<?php
include("connect.php");
$user=$_SESSION['username'];
$updated = FALSE;
$submit=FALSE;
if(count($_POST) > 0){

$library = $_POST['library'];
array_map('intval',$library);
$library = implode(',',$library);
mysql_query("UPDATE ES_Students SET library=0") or trigger_error(mysql_error

(),E_USER_ERROR);
mysql_query("UPDATE ES_Students SET library=1 WHERE StudentNO IN ($library)") or        trigger_error

(mysql_error(),E_USER_ERROR);
$submit=TRUE;
$updated=TRUE;
}
?>

My problem is, whenever no checkbox is checked, an error will occur that the library index is undefined and all. I know it’s got something to do with the $count($_POST)>0 but I don’t actually know how to fix this. I tried putting an else-clause to redirect it to another page but it will result to same error. Can anyone tell me what to do??

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1 Answer

  1. Editorial Team

    Use an isset around your post. PHP link

    if( isset($_POST) && count($_POST) > 0){
  ....

    If any data is sent at all, even a blank form, isset($_POST) will return true, but with a count($_POST) of 0. So, you could also test for the exact items of the array you’re looking for to be sure it is infact in the $_POST :

    if( isset($_POST) && count($_POST) > 0 && isset($_POST['library'])){
 ....
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