PHP中条件失败时返回值
如果查询失败,我需要返回false。。。我应该把它放在哪里PHP中条件失败时返回值,php,Php,如果查询失败,我需要返回false。。。我应该把它放在哪里 function asas($username,$password){ $qry = "SELECT * FROM members WHERE login='$username' AND passwd='".md5($password)."'"; $result = mysql_query($qry); while($row = mysql_fetch_ar
function asas($username,$password){
$qry = "SELECT *
FROM members
WHERE login='$username' AND passwd='".md5($password)."'";
$result = mysql_query($qry);
while($row = mysql_fetch_array($result))
{
return(array($row['userlevel'], $row['email']));
}
//return 'Invalid username / password ';
}
这是我通常认为它是这样写的。您甚至可以简单地返回false代码>直接在while循环之后。试试看,看看什么有效
这是我通常认为它是这样写的。您甚至可以简单地返回false代码>直接在while循环之后。试试看,看看什么有用。
失败时返回false,就像。因此,您的代码应该如下所示:
function asas($username,$password) {
$qry="SELECT *
FROM members
WHERE login='$username' AND passwd='".md5($password)."'";
$result=mysql_query($qry);
// if fail is intended the failure of the mysql connection
if (!$result) return false;
$row = mysql_fetch_array($result);
if ($row) return array($row['userlevel'],$row['email']);
// if fail is intended as username and password didn't match
return false;
}
您会注意到该函数有几个退出点。如果是家庭作业,你应该把它们集中在一个作业上。
function asas($username,$password){
$qry="SELECT * FROM members
WHERE login='$username' AND passwd='".md5($password)."'";
$result=mysql_query($qry);
if (!$result) {
/* Something went wrong with the query */
return false;
}
while($row = mysql_fetch_array($result))
{
return(array($row['userlevel'],$row['email']));
}
/* if the query found any rows then the code above would or returned it */
return false;
//return 'Invalid username / password ';
}
失败时返回false,就像。因此,您的代码应该如下所示:
function asas($username,$password) {
$qry="SELECT *
FROM members
WHERE login='$username' AND passwd='".md5($password)."'";
$result=mysql_query($qry);
// if fail is intended the failure of the mysql connection
if (!$result) return false;
$row = mysql_fetch_array($result);
if ($row) return array($row['userlevel'],$row['email']);
// if fail is intended as username and password didn't match
return false;
}
您会注意到该函数有几个退出点。如果是家庭作业,你应该把它们集中在一个答案中。我编辑了你的答案,因为代码没有缩进,因此在显示时没有格式化。您可以使用编辑器中的“代码格式”按钮来执行此操作(上面有二进制数字的按钮)。欢迎使用堆栈溢出:)我编辑了您的答案,因为代码没有缩进,因此在显示时没有格式化。您可以使用编辑器中的“代码格式”按钮来执行此操作(上面有二进制数字的按钮)。欢迎使用堆栈溢出:)
function asas($username,$password){
$qry="SELECT * FROM members
WHERE login='$username' AND passwd='".md5($password)."'";
$result=mysql_query($qry);
if (!$result) {
/* Something went wrong with the query */
return false;
}
while($row = mysql_fetch_array($result))
{
return(array($row['userlevel'],$row['email']));
}
/* if the query found any rows then the code above would or returned it */
return false;
//return 'Invalid username / password ';
}