php - How to write data into .txt file in codeigniter -

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i have folder in assets name login.my doubt how set path.

$data=$id.'~'.$expense_type.'~'.$amount.'~'.$exp_date.'<br>';  $todate= date('y-m-d'); echo $todate; if ( ! write_file('.../assets/login/log_'.$todate.'.txt', $data)) { echo 'unable write file'; } else {  echo 'file written!'; }

no problem data path wrong set

my path 'localhost/project/pro/application/assets/login/(specific .txt file)'

output unable write file

use apppath. path application folder

if ( ! write_file(apppath."assets/login/log_$todate.txt", $data))

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