<?php

require("check_mu.php");

$file = file_get_contents("file.txt");

preg_match_all("#Username:(.*)Password:#",$file,$user);
preg_match_all("#Password:(.*)Username#",$file,$pass);

$i = 0;

while($user[1][$i] && $pass[1][$i]){
    if(check_mu($user[1][$i], $pass[1][$i])==1){
        //add dans ta sql.
    }
    $i++;
}
?>