未定義在多個查詢偏移

我現在可以輸出員工已登錄我想現在要做的日期和時間是使用的輸出。在TIMEDIFF FUNCTION的時間欄，以便我可以用它來計算該人的工資。事情是我不知道如何調試這個錯誤，非常感謝任何幫助。

下面的代碼：

<!DOCTYPE html> 
<html> 
<head> 
<style> 
table, th, td { 
border: 1px solid black; 
} 
</style> 
</head> 
<body> 

<?php 
$con=mysqli_connect("localhost","root","","september-system"); 


// Check connection 
if (mysqli_connect_errno()) 
{ 
echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
} 

$sql = "SELECT User_ID, MIN(TIME(Time)) as time, DATE(Time) as day FROM records GROUP BY User_ID, day ORDER BY User_ID, day;"; 
$sql .= "SELECT TIMEDIFF('08:00:00', '07:00:00');"; 

// Execute multi query 
if (mysqli_multi_query($con,$sql)) 
{ 
do 
{ 
// Store first result set 
if ($result=mysqli_store_result($con)) { 
    echo "<table><tr><th>USER ID</th><th>TIME</th><th>DATE</th></tr>"; 
// output data of each row 
    while ($row=mysqli_fetch_row($result)) 
    { 
    echo "<tr><td>" . $row[0]. "</td><td>" . $row[1]. 
    "</td><td>" . $row[2]. "</td></tr>"; 

    } 
    // Free result set 
    mysqli_free_result($result); 
    } 
} 
while(mysqli_more_results($con) && mysqli_next_result($con)); 
} 

mysqli_close($con); 
?>

的var_dump($row)

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '14:31:24' (length=8) 
    2 => string '2016-09-09' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '15:02:05' (length=8) 
    2 => string '2016-09-10' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '00:48:18' (length=8) 
    2 => string '2016-09-12' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '18:39:46' (length=8) 
    2 => string '2016-09-14' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '18:54:04' (length=8) 
    2 => string '2016-09-15' (length=10) 

C:\wamp64\www\test1.php:36: 
    array (size=3) 
    0 => string '1' (length=1) 
    1 => string '08:32:15' (length=8) 
    2 => string '2016-09-16' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '10:06:37' (length=8) 
    2 => string '2016-09-17' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '17:09:14' (length=8) 
    2 => string '2016-09-18' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '12:32:52' (length=8) 
    2 => string '2016-09-19' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '09:11:34' (length=8) 
    2 => string '2016-09-20' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '08:35:24' (length=8) 
    2 => string '2016-09-21' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '21:42:45' (length=8) 
    2 => string '2016-09-22' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '1' (length=1) 
    1 => string '10:08:21' (length=8) 
    2 => string '2016-09-23' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '2' (length=1) 
    1 => string '00:12:38' (length=8) 
    2 => string '2016-09-16' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '3' (length=1) 
    1 => string '23:52:06' (length=8) 
    2 => string '2016-09-15' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '4' (length=1) 
    1 => string '09:11:54' (length=8) 
    2 => string '2016-09-16' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=3) 
    0 => string '4' (length=1) 
    1 => string '12:22:07' (length=8) 
    2 => string '2016-09-21' (length=10) 

C:\wamp64\www\test1.php:36: 
array (size=1) 
    0 => string '01:00:00' (length=8)

來源

2016-09-23 Jopeth Deza

正確的結果，如果你對此有何評論這一部分，您的問題將不復存在。

$sql .= "SELECT TIMEDIFF('08:00:00', '07:00:00');";

這個查詢的輸出是一個簡單的數組是這樣的：

Array ([0] => 01:00:00)

來源

2016-09-23 06:33:26 vahob

我需要有日誌的時間和差異早上7點，我計算上的工資中扣除總是遲到的員工。有關如何做到這一點的任何建議？感謝您的迴應 –

未定義在多個查詢偏移

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