Variable to = specific parts of array - php

Question

I have 36 check boxes... I call them with this.
Labeled like this.
<input type='checkbox' value='1' name='ck[]'>
Called like this
$checks = $_POST['ck']
$vars = array(
'ck1' => 'Demo',
'ck2' => 'Demo2',
'ck3' => 'Demo3',
'ck4' => 'Demo4',
'ck5' => 'Demo5',
'ck6' => 'Demo6',
'ck7' => 'Demo7',
'ck8' => 'Demo8',
'ck9' => 'Demo9',
'ck10' => 'Demo10',
);
foreach($vars as $key=>$default) {
$checks[$key] = !empty($checks[$key]) ? $default : '';
}
How can I now make it where 2 new variables = specifics from that post.
For instance,
$CH1 = checks[1] - checks[6];
$ch2 = checks[6] - checks[10];
And then,
How can I make it where if there are numbers in $CH1 it will list and break.. like this
$checks[1] . '<br>' . $checks[2] and so on....
UPDATE***
$vars = array(
'1' => 'Desktop',
'2' => 'Laptop Only',
'3' => 'Laptop / Dock',
'4' => 'Laptop Case',
'5' => 'Desk Phone',
'6' => 'Monitor',
'7' => 'Printer Access',
'8' => 'Printer - Personal',
'9' => 'Email(phone)',
'10' => 'Office 365',
'11' => 'Sharepoint',
'12' => 'Fax Fwd',
'13' => 'Adobe DC',
'14' => 'Apacheta',
'15' => 'Brightree',
'16' => 'TeamDME',
'17' => 'DirectView',
'18' => 'RingCentral',
'19' => 'Faxage',
'20' => 'Google Docs',
'21' => 'Badge Access',
'22' => 'Title Plate',
'23' => 'Bis Cards',
'24' => 'Travel',
'25' => 'Exp Reports',
'26' => 'Order Pads',
'27' => 'Demo Trilogy',
'28' => 'Stickers',
'29' => 'APS',
'30' => 'CBSS',
'31' => 'Conexis',
'32' => 'Evenfy',
'33' => 'Inventory',
'34' => 'AMEX',
'35' => 'Fuel Card',
'36' => 'Vehicle'
);
foreach($vars as $key=>$default) {
$checks[$key] = !empty($checks[$key]) ? $default : '';
}
When I echo $checks, it just says array.. does not show any numbers names that were checked.

Answer 1

If you are trying to dinamically read the values, you can construct the key value with the name you already have:
$num_a = 1;
$num_b = 6;
$CH1 = checks['ck' . $num_a] - checks['ck' . $num_b];

Answer 2

You might want to use array_slice:
$CH1 = array_slice($checks, 0, 6);
Now $CH1 will be an array with the first 6 checks only. To get the next 10 (for instance):
$CH2 = array_slice($checks, 6, 10);
...etc.
Then you can loop through them just like you would do with another array:
foreach($CH1 as $chk) {
//
}
If you want to check if any of those is numeric, use is_numeric:
foreach($CH1 as $chk) {
if (is_numeric($chk)) echo $chk . "<br>";
}
You can also filter an array based on a condition. Let's say you want to eliminate the empty elements from the $checks array:
$filtered = array_filter($checks, function ($chk) { return !empty($chk); });
... and now output that filtered array with each entry on a separate line:
echo implode('<br>', $filtered);
Finally, you can use array_intersect_key to get out of your $vars array only those elements that have been checked, as follows:
$result = array_intersect_key($vars, array_flip($_POST['ck']));
So, if the user had selected checkboxes with value 1, 5 and 10, the $results array will look like this:
array (
1 => 'Desktop',
5 => 'Desk Phone',
20 => 'Google Docs',
)
See it on eval.in.
I hope these ideas will all be helpful and of use to you.