$handle = @foPEn("55.txt","r");
if ($handle) {
    while (($buffer = fgets($handle,4096)) !== false) {      
        $d = explode(" ",$buffer);
        foreach($d as $val) { 
            echo '<br>'.trim($val,'.');  //why not work 
        }   
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
    }   
    fclose($handle);
}

trim()不会修剪’.’.