Ci 3 $_POST not accepting spaces?

You will need to put your options in a quoted string. Or generate slugs that change spaces into hyphens (-).

PHP Code:

<input name="options['<?= $row ?>']" value ="1" type="checkbox"> 


I tried this, but it doenst work either. 
it returns :

array(1) { [0]=> string(1) "1" }, even for the keys that have no spaces in them like the word "ABS"

the only thing that seems to work is 

PHP Code:

<input name="options[<?= $row ?>]" value ="1" type="checkbox"> 


and this only works if there is no space in the key.