in reply to showing the error ,Can't modify concatenation (.) or string in scalar assignment
On the left hand side of your assignment
my $check_.$usr = $cgi->param("$chck_.$usr");
you do not have an item that something can be assigned to as it is the concatenation of two strings. You need to define a new variable for that purpose, eg
my $check_usr = $cgi->param("$chck_.$usr");
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