PHP program for batch generating random usernames

/* Extract random values ​​from dictionary file*/
$file1 = "./Words.dic";
$file2 = "./common_pass_mini.dic";
$file3 = "./Sys_Month_Date.Dic";
$rfile = "./5.dic";
$n = 2000;
//Extract dictionary
$basef = file( $file1);
$extf = file($file2);
$extf2 = file($file3);
$bf_sum = (count($basef)-1);
$ef_sum = (count($extf)-1 );
$ef2_sum =(count($extf2)-1);
//Get a random username
for ($i=0; $i<$n; $i++)
 {
$bn = crand(0, $bf_sum);
$en = crand(0, $ef_sum);
$en2 = crand(0, $ef2_sum);
$name = $basef[$bn]."_ ".$extf[$en];
$name = str_replace("/r/n", "", $name);
$all_name[] = $name;
}
 //Write file
$result = implode("/r/n", $all_name);
$fp = fopen($rfile, "a+") or die('Open $rfile failed');
if (fwrite ($fp, $result)) {
echo 'Write user succeed!';
} else {
echo 'Write user failed';
}
//Generate random number function
function crand($start, $end)
{
return mt_rand($start, $end);
}
?>

2. Merge the several files generated above result

/* Merge all generated results jbxue.com*/
$result_file = "./result.dic";< /p>
$fp = fopen($result_file, "a+") or die("Open $result_file failed");
//Merge 1.dic ~ 5. dic
for ($i=1; $i<=5; $i++)
{
$cur_file = file_get_contents($i.".dic");
fwrite($fp, $cur_file);
}
//Merge 10.dic ~ 11.dic
for ($i=10; $i<=11; $i++)
{
$cur_file = file_get_contents($i.".dic") ;
fwrite($fp, $cur_file);
}
fclose($fp);
echo 'Write Succeed';
?>

3. Filter duplicate values and values ​​that do not fall between 6 and 16, and generate final usable data

/* Generate final result*/
$file = "./result.dic";
$target = ". /target.dic";
//Remove duplicate values ​​
$files = file($file);
$files = array_unique($files);
$sum = count($files);
for ($i=0; $i<$sum; $i++)
{
if (strlen($files[ $i])>=6 && strlen($files[$i])<=16) {
$rs[] = $files[$i];
} else {
continue;
}
}< /p>
//Write the target file
$result = implode("", $rs);
$fp = fopen($target, "a+") or die("Open $target failed") ;
fwrite($fp, $result);
echo 'Write succeed';
?>