text-shadow ： none | <length> none | [<shadow>, ] * <shadow> 或none | <color> [, <color> ]*

UPDATE 表名 SET
指定字段 = replace(指定字段, ’要替换的字符串’, ’想要的字符串’) 
WHERE 条件;

UPDATE `qlj_joke` SET content = replace(content,' ','') ;

/**  
 *  将一个字串中含有全角的数字字符、字母、空格或'%+-()'字符转换为相应半角字符  
 *  
 * @access  public  
 * @param   string       $str         待转换字串  
 *  
 * @return  string       $str         处理后字串  
 */  
function make_semiangle($str)   
{   
    $arr = array('０' => '0', '１' => '1', '２' => '2', '３' => '3', '４' => '4',   
                 '５' => '5', '６' => '6', '７' => '7', '８' => '8', '９' => '9',   
                 'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D', 'Ｅ' => 'E',   
                 'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I', 'Ｊ' => 'J',   
                 'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N', 'Ｏ' => 'O',   
                 'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S', 'Ｔ' => 'T',   
                 'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X', 'Ｙ' => 'Y',   
                 'Ｚ' => 'Z', 'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd',   
                 'ｅ' => 'e', 'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i',   
                 'ｊ' => 'j', 'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n',   
                 'ｏ' => 'o', 'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's',   
                 'ｔ' => 't', 'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x',   
                 'ｙ' => 'y', 'ｚ' => 'z',   
                 '（' => '(', '）' => ')', '〔' => '[', '〕' => ']', '【' => '[',   
                 '】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']',   
                 '‘' => '[', '’' => ']', '｛' => '{', '｝' => '}', '《' => '<',   
                 '》' => '>',   
                 '％' => '%', '＋' => '+', '—' => '-', '－' => '-', '～' => '-',   
                 '：' => ':', '。' => '.', '、' => ',', '，' => '.', '、' => '.',   
                 '；' => ',', '？' => '?', '！' => '!', '…' => '-', '‖' => '|',   
                 '”' => '"', '’' => '`', '‘' => '`', '｜' => '|', '〃' => '"',   
                 '　' => ' ');   
 
    return strtr($str, $arr);   
}

function &StrToDBC($str,$Encode='GBK'){
 if($Encode!='UTF8')$str=mb_convert_encoding($str,'UTF-8',$Encode);
 $ret='';
 for($i=0;$s1=$str[$i],$i<strlen($str);$i++){
  if(($c=ord($s1))&0x80){
   $s2=$str[++$i];
   $s3=$str[++$i];
   $c=(($c&0xF)<<12)|((ord($s2)&0x3F)<<6)|(ord($s3)&0x3F);
   if($c==12288){
    $ret.=' ';
   }elseif($c>65280&&$c<65375){
    $c-=65248;
    $ret.=chr($c);
   }else{
    $ret.=$s1.$s2.$s3;
   }
  }else{
   $ret.=$str[$i];
  }
 }