- or download this
if($str_check = undef){do stuff};{return ('0');}else{return($str_check
+);}
- or download this
if($str_check = undef) ...
- or download this
if (! defined $str_check) ...
- or download this
if($str_check = undef){do_stuff()};
- or download this
return $str_check if defined $str_check;
return '0';