PHP新手问题：首次进页面select全部数据，点击条件后按条件select数据库数据

<?php$where="where 1=1";if(isset($_POST['seach'])){	if(!empty($_POST['name'])) $where.=" and name='$_POST[name]'";	if(!empty($_POST['age'])) $where.=" and age='$_POST[age]'";}$sql="select * from table {$where}";echo $sql;?><form action="" method="post"><input type="text" name="name" value="" /><input type="text" name="age" value="" /><input type="submit" name="seach" value="seach" /></form>

<?php$where="where 1=1";if(isset($_GET['seach'])){    if(!empty($_GET['name'])) $where.=" and name='$_GET[name]'";    if(!empty($_GET['age'])) $where.=" and age='$_GET[age]'";}$sql="select * from table {$where}";echo $sql;?><a href="?seach=1&name=asd&age=22">asdad</a>