indexing - PHP undefined index submitting textboxes -


i have huge table of textboxes , i'm submitting them all, , named number of row "-" number of column (ex: 1 - 1; 1 - 2; 1 - 3; 1 - 4; 1 - 5; 2 - 1;...), , i'm trying when button named 'sub' clicked, it'll go 1 one , echo content of textbox, reason php error notification this: 

notice: undefined index: 1 - 1 in c:\xampp\htdocs\a11096\2tabelas.php on line 474  notice: undefined index: 1 - 2 in c:\xampp\htdocs\a11096\2tabelas.php on line 474  notice: undefined index: 1 - 3 in c:\xampp\htdocs\a11096\2tabelas.php on line 474  notice: undefined index: 1 - 4 in c:\xampp\htdocs\a11096\2tabelas.php on line 474  notice: undefined index: 1 - 5 in c:\xampp\htdocs\a11096\2tabelas.php on line 474

and on...

my code this:

 if(isset($_post['sub'])){       ($i=1;$i<=20;$i++){         ($k=1;$k<=5;$k++){             $tst= $i .' - '. $k;             $txt[$k]=$_post[$tst];             echo $txt[$k];          }     }  }

update

after time noticed using id field, not name, , post method uses name, switched name field , same error still persists.

you adding spaces around constant string in line 

$tst= $i .' - '. $k;

which means code looks elements "1 - 1" instead of "1-1".

change 

$tst= $i .'-'. $k;

to desired effect.


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