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这个不知道错哪了7,8行报错

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Release: 2016-06-13 13:40:20
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这个不知道哪里错了7,8行报错

include("includes/config.php");
//第 7,8 行报错
lei(0);
$ii=0;
function lei($belongs_id){
$sql=mysql_query("select * from pro_type where belongs_id='".$belongs_id."'",$conn);
while($rs_info=mysql_fetch_array($sql)){
//大类
if($belongs_id==0){
echo "大类";
}else{
echo "小类";
}
$ii=$ii+1;
lei($rs_info["id"]);
$ii=$ii-1;
}
}
?>

------解决方案--------------------
发现是变量作用域的问题。函数里的变量是局部变量,$conn要想使用全局变量,就得声明为global
------解决方案--------------------

PHP code

include("includes/config.php");
//第 7,8 行报错
lei(0);
$ii=0;
function lei($belongs_id){

// 解决方法1, 不填$conn
$sql=mysql_query("select * from pro_type where belongs_id='".$belongs_id."'");
// 解决方法2, 以参数传递,或声明为全局
// global $conn;
// $sql=mysql_query("select * from pro_type where belongs_id='".$belongs_id."'", $conn);


while($rs_info=mysql_fetch_array($sql)){
//大类
if($belongs_id==0){
echo "大类";
}else{
echo "小类";
}
$ii=$ii+1;
lei($rs_info["id"]);
$ii=$ii-1;
}
}
?>
<br><font color="#e78608">------解决方案--------------------</font><br>难道要<br>global $conn ;<br>$sql=mysql_query("select * from pro_type where belongs_id='".$belongs_id."'",$conn);<br> <div class="clear">
                 
              
              
        
            </div>
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