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老師我的代碼都是按照你視頻中的內容寫得。但執行的時候出現錯誤，不解：--Warning: mysql_fetch_assoc() expects parameter 1 to be resource, boolean given in D:\xampp\htdocs\test\listcate.php on line 9?Array ( )-------?

---代碼如下----請老師幫我看看哪里出現錯誤？

<?php

include('db.inc.php');

function getList($pid = 0,&$result=array(),$spac = 0)

{

$spac+=2;

$sql = "SELECT * FROM tb_cate WHERE pid = $pid";

$res = mysql_query($sql);

while($row = mysql_fetch_assoc($res))

{

$row['catename'] = str_repeat('&nbsp;',$spac).'|__'.$row['catename'];

$result[]=$row;

getList($row['id'],$result,$spac);

}

return $result;

}

$rs = getList();

print_r($rs);

?>