复制文件并在规定行插入数据

/*public function copyfile($str,$pre){
    copy('test.php','array.php');
    $arrInsert = insertfile("array.php", $str, 3, 0);
    unlink("array.php");
    foreach($arrInsert as $value)
    {
        file_put_contents($pre.".php", $value, FILE_APPEND);
    }

}
public function insertfile($source, $s, $iLine, $index) {
    $file_handle = fopen($source, "r");
    $i = 0;
    $arr = array();
    while (!feof($file_handle)) {
        $line = fgets($file_handle);
        ++$i;
        if ($i == $iLine) {
            if($index == strlen($line)-1)
                $arr[] = substr($line, 0, strlen($line)-1) . $s . "n";
            else
                $arr[] = substr($line, 0, $index) . $s . substr($line, $index);
        }else {
            $arr[] = $line;
        }
    }
    fclose($file_handle);
    return $arr;
}*/