Remove duplicate data in a text file with php

Question

I am in need to open a text file (file.txt) which contains data in the following format

ai
bt
bt
gh
ai
gh
lo
ki
ki
lo

ultimately I want to remo

Answer 1

This should do the trick:

$lines = file('file.txt');
$lines = array_unique($lines);

file() reads the file and puts every line in an array.

array_unique() removes duplicate elements from the array.

Also, to put everything back into the file:

file_put_contents('file.txt', implode($lines));