废话不多说，直接上代码

<?phpset_time_limit(0);$con = mysql_connect("localhost", "root", "root");$dbname = "db";if ($con) { if (mysql_select_db($dbname, $con)) { $sql = "show tables like 'pre_tb_%'"; $ret = mysql_query($sql); while($row = mysql_fetch_assoc($ret)){ $info1[] = $row; } foreach ($info1 as $v) { $chidarr1[] = substr($v['Tables_in_multiopen (pre_tb_%)'],7);//获取标记号 } foreach ($chidarr1 as $val) { $tabname = 'stat_adclick_'.$val; $sql = "alter table $tabname add column c2 int default 0 after p"; mysql_query($sql); $sql = "alter table $tabname DROP PRIMARY KEY"; mysql_query($sql); $sql = "alter table $tabname add primary key(c2,p)"; mysql_query($sql); $sql = "alter table $tabname drop index old_index"; mysql_query($sql); $sql = "create index idx_newincex on $tabname (c2,p)"; mysql_query($sql); } }}mysql_close($con);?>

以上这篇php批量修改表结构实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。