从php中的文本文件中删除匹配项

Question

Consider a txt file of a list of items

qqqqqq

eeeeee

dddddd

hhhhhh

dddddd

hhhhhh

999999

And some of the items in the list are duplicates. how do I output a using php a text file where anything that is duplicated is removed.

the result:

qqqqqq

eeeeee

999999

Answer 1

<?php

$file = file_get_contents('file.txt'); //get file to string
$row_array = explode("
",$file); //cut string to rows by new line
$row_array = array_count_values(array_filter($row_array));

foreach ($row_array as $key=>$counts) {
    if ($counts==1)
        $no_duplicates[] = $key; 
}

//do what You want
echo '<pre>';
print_r($no_duplicates);

file_put_contents('no_duplicates.txt',$no_duplicates); //write to file. If file don't exist. Create it.