$temp2 ='十年';
mysql_query("SET NAMES GBK");
$res = mysql_query("select songer_name from song_tab where song_name ='十年'");
可以查询出结果
但是
$temp2 ='十年';
mysql_query("SET NAMES GBK");
$res = mysql_query("select songer_name from song_tab where song_name =$temp2");
就不行了
$res = mysql_query("select songer_name from song_tab where song_name ='$temp2'");
或 ‘{$temp2'}’都可以