去掉字符串中的中文    

$a = "<a>河蟹社会afeowahgieawhjozf候蛇fawgwea维稳aghoiawghowi我日</a>";  $result = preg_replace('/([\x80-\xff]*)/i','',$a);  var_dump($result);

[PHP]代码    

<?php  try  {      $hostname = "localhost";      $dbname = "xxxx";      $username = "root";      $pw = "xxxx";      $pdo = new PDO ("mysql:host=$hostname;dbname=$dbname", "$username", "$pw");      $db->query("set names utf-8");  }   catch (PDOException $e)  {      echo "Failed to get DB handle: " . $e -> getMessage() . "\n";      exit;  }   $query = $pdo -> prepare("select id,store_image FROM store");  $query -> execute();    for($i = 0; $row = $query -> fetch(); $i++)  {      $new_file = preg_replace('/([\x80-\xff]*)/i', '',$row['store_image']);      $id=$row['id'];      $sql="update store set store_image='$new_file' where id=$id";      $pdo->exec($sql);      }     /*  $it = new RecursiveDirectoryIterator("./avatar");  foreach(new RecursiveIteratorIterator($it) as $file)  {      echo $file . "\n";      $new_file = preg_replace('/([\x80-\xff]*)/i', '', $file);      rename($file, $new_file);  }   */