Windows 10: Undefined variable error in array (PHP)

Discus and support Undefined variable error in array (PHP) in Windows 10 Software and Apps to solve the problem; I have a collection of check boxes all with the name c[] but different values. From php8 the code below works but gives me an 'Undefined variable... Discussion in 'Windows 10 Software and Apps' started by Perantine, Apr 26, 2021.

  1. PERANTINE
    Perantine Win User

    Undefined variable error in array (PHP)


    I have a collection of check boxes all with the name c[] but different values. From php8 the code below works but gives me an 'Undefined variable $sql_c’ warning (perhaps this error was just suppressed in earlier versions?). I was given the code years back and have now updated it with numerous 'if isset()' functions, but if I do that to the $sql_c function, I get no results. Any help would be appreciated.

    if (isset($_POST['submit']) && isset($_POST['c'])) {

    $sql="stuno,fname,lname"...

    Read more
     
    Perantine, Apr 26, 2021
    #1
  2. AQUINUS
    Aquinus Win User

    PHP - Setting session variables from database records?

    I typically use PostgteSQL and I have a web framework I've been developing which is soon to be used in production where I work. It simplifies a lot of things, such as not having to worry about connecting to the database or handling errors, because the database abstraction layer handles that. I don't know about MySQLi, but PostgreSQL will tell you what a query has returned.

    So in what I've written (using postgresql,) it would look like this:

    Code: class SomeNewController { public function index() { $db = \Plum\DB::get_conn(); $rec = $db->select('users', array('email' => \Plum\HTTP::input('email')), 1); // Or: $rec = $db->select_sql('SELECT * FROM {users} WHERE email = ?', array(\Plum\HTTP::input('email')), 1); if(!empty($rec)) { \Plum\Session::set('email', $rec->email); } } }[/quote] I would have used php tags, but for some reason wrapping php code with namespacing in PHP tags strips the backslashes out, which are needed to determine namespace scope.


    No, but it returns a type that PHP interprets as a false, but that isn't what I was talking about. mysql_fetch_assoc says this in php.net's doc.
    Just because a query returns no rows doesn't mean it threw an error.
     
    Aquinus, Apr 26, 2021
    #2
  3. CALEB
    caleb Win User
    PHP - Setting session variables from database records?

    PS. I see they are suggesting to move out to PDO from regular query stuff nowdays. I'd go with their suggestions as they move PHP development very quickly.
     
    caleb, Apr 26, 2021
    #3
  4. W1ZZARD
    W1zzard Win User

    Undefined variable error in array (PHP)

    PHP dynamic page + return results into a dynamic table

    you probably want to turn on error reporting in php.ini. that will give much better error messages

    also i suggest to separate code and design more. put the php code at the start, save data into php variables and then use a minimum of php code in the html section, basically just echo and foreach. that also saves you from having all those echos around.

    something like that
    Code: <?php $foo='bar'; ?> <html><body><?php echo $foo; ?></body></html>[/quote]
     
    W1zzard, Apr 26, 2021
    #4
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Undefined variable error in array (PHP)

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