PHP - How to get the value of multiple checkbox along with an input type

Question

I wanted to create an error when a specific value of $_POST['MAG'] is selected and the input type next to it isn't given.

I've tried to use other methods like if, else, foreach, for, and I still can't seem to get the right coding. I need really need help.

Its my first time coding and i'm taking online classes so its a bit difficult to get help from classmates or teacher

 <form method="post" action="">

  Select which magazine and type qty of subscriptions:<br><br>

  <input type="checkbox" name="MAG[]" value="TREASURE"><b>Treasure Magazine</b> | Qty of Subscriptions: <input type="number" name="TNUMSUBS" size="5px">
  <br>

  <input type="checkbox" name="MAG[]" value="VESSEL"><b>Vessel Magazine</b> | Qty of Subscriptions: <input type="number" name="VNUMSUBS" size="5px">
  <br>

  <input type="checkbox" name="MAG[]" value="MECH"><b>MECH Magazine</b> | Qty of Subscriptions: <input type="number" name="MNUMSUBS" size="5px">
  <br><br>

  <p><input type="submit" name="submit"></p>

</form>


<?php
if (isset($_POST["submit"]))
{
$vNumSubs = $_POST['VNUMSUBS'];
$tNumSubs = $_POST['TNUMSUBS'];
$mNumSubs = $_POST['MNUMSUBS'];

    if(empty($_POST["MAG"]))
    {
        print "You didn't select a magazine";

        foreach($_POST['MAG'] as $magazine)
        {

            if($magazine == "TREASURE" && empty($tNumSubs))
            {
            print "type quantity";
            }

            if($magazine == "VESSEL" && empty($vNumSubs))
            {
                print "type quantity";
            }

            if($magazine == "MECH" && empty($mNumSubs))
            {
                print "type quantity";
            }
        }
    }


}

I tried using the empty() and i'm having a hard time makign it show. please help

make your life easy, specify the MAG array keys your self

user9487972
– user9487972

2018-05-14 23:41:26 +00:00
Commented May 14, 2018 at 23:41 — user9487972
– user9487972, Commented May 14, 2018 at 23:41
$_POST['MAG'] will get all data of name="MAG[]"

hungrykoala
– hungrykoala

2018-05-15 01:41:44 +00:00
Commented May 15, 2018 at 1:41 — hungrykoala
– hungrykoala, Commented May 15, 2018 at 1:41

Barmar · Accepted Answer · 2018-05-14 23:56:31Z

1

Your foreach is in the block that's executed when $_POST['MAG'] is empty, so there's nothing to loop over (it will actually get an error, since $_POST['MAG'] is undefined when none of the boxes are checked, and you can't use foreach on this).

It should be in the else block.

if(empty($_POST["MAG"])) {
    print "You didn't select a magazine";
} else {
    foreach($_POST['MAG'] as $magazine)
    {
        if($magazine == "TREASURE" && empty($tNumSubs))
        {
            print "type quantity";
        }

        if($magazine == "VESSEL" && empty($vNumSubs))
        {
            print "type quantity";
        }

        if($magazine == "MECH" && empty($mNumSubs))
        {
            print "type quantity";
        }
    }
}

But maybe you shouldn't bother with the checkboxes. Just let them fill in the quantity of each magazine, and use 0 to mean that they don't want that magazine.

edited May 14, 2018 at 23:56

answered May 14, 2018 at 23:49

Barmar

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1 Comment

Jamie Oh Over a year ago

Thank you soooo much. That really helped a lot! Still new at this so its always nice to get feedback!

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