<?php
$new = array("12", "11", "10", "9", "8", "7", "6", "5", "4");
$old = array("10", "9", "8", "7", "6", "5", "4", "3", "2", "1");
$result = array_diff($new, $old);
print_r($result);
?>
The result is
Array ( [0] => 12 [1] => 11 )so12 and 11According to this example how to use array_diff for (.txt) files in PHP?
Here are (.txt) examples:
New (.txt) file
Something here12
Something here11
Something here10
Something here9
Something here8
Something here7
Something here6
Something here5
Something here4
Something here3
Old (.txt) file
Something here10
Something here9
Something here8
Something here7
Something here6
Something here5
Something here4
Something here3
Something here2
Something here1
Output (.txt) file
Something here12
Something here11
You just need to reproduce your arrays from the text files :
<?php
$new = explode(PHP_EOL, file_get_contents('new.txt').PHP_EOL);
$old = explode(PHP_EOL, file_get_contents('old.txt').PHP_EOL);
$result = array_diff($new, $old);
$output= fopen("Output.txt", "w") or die("Unable to open file!");
foreach($result as $value){
fwrite($output, $value.PHP_EOL);
}
?>
I am not sure if you wanted the strip the "Something here" but in your exemple output.txt it seems like not.