How to automatically organize employee attendance data in PHP?

How to automatically organize employee attendance data in PHP?

Background introduction:
In a business or organization, employee attendance data is a key management information. In order to facilitate the management and statistics of employee attendance, we can use the PHP programming language to automatically organize employee attendance data. This article will introduce how to use PHP to write code to achieve this function, and give specific code examples.

Step 1: Create database and data table
First, we need to create a database and corresponding data table to store employee attendance data. You can use MySQL or other database management systems to create a database and create a data table named "attendance" in it. The structure of the data table can be designed in the following format:

CREATE TABLE attendance (
id INT(11) NOT NULL AUTO_INCREMENT,
employee_id INT(11) NOT NULL,
date DATE NOT NULL,
time_in TIME NOT NULL,
time_out TIME DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

The data table contains the following fields:

• id: The unique identifier of the attendance record, generated by auto-increment;
• employee_id: The unique identifier of the employee;
• date: The attendance date;
• time_in : Working time;
• time_out: Off-duty time.

Step 2: Connect to the database
In the PHP code, we need to connect to the database and select the database to use. You can use the following code to connect to the database:

$host = "localhost";
$db_username = "root";
$db_password = "";
$db_name = "attendance";

$conn = mysqli_connect($host, $db_username, $db_password, $db_name);

// Check whether the connection is successful
if ( !$conn) {

die("连接数据库失败：" . mysqli_connect_error());

}
?>

Step 3: Query attendance data
Next, we need to query the attendance data in the database and sort it by employee and Group by date. You can use the following code to achieve this:

$sql = "SELECT employee_id, date, time_in, time_out FROM attendance GROUP BY employee_id, date";
$result = mysqli_query($ conn, $sql);

if (mysqli_num_rows($result) > 0) {

// 输出每一条考勤记录
while ($row = mysqli_fetch_assoc($result)) {
    $employee_id = $row['employee_id'];
    $date = $row['date'];
    $time_in = $row['time_in'];
    $time_out = $row['time_out'];

    // 在这里进行考勤记录的处理，例如计算工作时长、判断是否迟到早退等
    // ...

    // 输出处理后的考勤记录
    echo "员工ID：" . $employee_id . "，日期：" . $date . "，上班时间：" . $time_in . "，下班时间：" . $time_out . "<br>";
}

} else {

echo "没有找到任何考勤记录";

}

// Close the database connection
mysqli_close($conn);
?>

Step 4: Process attendance data
In the comment part of the above code, we can perform specific attendance data processing, For example, calculate working hours, determine whether you are late and leave early, etc. This is customized based on specific business needs. The following is a simple example:

// Calculate working hours
function calculateWorkHours($time_in, $time_out)
{

// 将时间转换为时间戳
$time_in_timestamp = strtotime($time_in);
$time_out_timestamp = strtotime($time_out);

// 计算时长（分钟）
$work_hours = ($time_out_timestamp - $time_in_timestamp) / 60;

return $work_hours;

}

// Determine whether you are late or leave early
function checkLateOrEarly($time_in, $time_out)
{

$late_or_early = "";

$time_in_timestamp = strtotime($time_in);
$time_out_timestamp = strtotime($time_out);

$standard_time_in = strtotime("09:00:00");
$standard_time_out = strtotime("17:00:00");

if ($time_in_timestamp > $standard_time_in) {
    $late_or_early .= "迟到";
}

if ($time_out_timestamp < $standard_time_out) {
    $late_or_early .= "早退";
}

return $late_or_early;

}
?>

Step 5: Organize and output attendance data
After querying the attendance records and performing related processing, we can organize the processed attendance data into the required format and output it to the page or save it to other files.

You can use the following code to organize and output attendance data:

if (mysqli_num_rows($result) > 0) {

$attendance_data = array();

while ($row = mysqli_fetch_assoc($result)) {
    $employee_id = $row['employee_id'];
    $date = $row['date'];
    $time_in = $row['time_in'];
    $time_out = $row['time_out'];

    $work_hours = calculateWorkHours($time_in, $time_out);
    $late_or_early = checkLateOrEarly($time_in, $time_out);

    $attendance_data[$employee_id][$date] = array(
        'time_in' => $time_in,
        'time_out' => $time_out,
        'work_hours' => $work_hours,
        'late_or_early' => $late_or_early
    );
}

// 输出整理后的考勤数据
foreach ($attendance_data as $employee_id => $attendance) {
    echo "员工ID：" . $employee_id . "<br>";

    foreach ($attendance as $date => $data) {
        echo "日期：" . $date . "<br>";
        echo "上班时间：" . $data['time_in'] . "<br>";
        echo "下班时间：" . $data['time_out'] . "<br>";
        echo "工作时长：" . $data['work_hours'] . "分钟<br>";
        echo "迟到或早退：" . $data['late_or_early'] . "<br>";
        echo "<br>";
    }
}

} else {

echo "没有找到任何考勤记录";

}
?>

Summary:
Through the above steps, we can use the PHP programming language to automatically organize employee attendance data. By connecting to the database, querying attendance data, processing attendance data, and finally sorting out the output, employees' attendance status can be easily managed and counted. Of course, the above is just a simple example, and the specific implementation can be adjusted and customized according to the actual situation.

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