Question

我无法使用

的循环变量$counter

$HA_Row = mysql_fetch_array($HA_Res);

表示我将获得哪一行数据。基本上，我不知道一起使用$counter和$HA_Res。

我想它可以显示不同的行＆＃39;我的数据库的数据。

例如，像

echo "$HA_Row[Check_In_Date]"

我试过了

echo "$HA_Row[$counter][Check_In_Date]"

和

echo "$HA_Row[Check_In_Date][$counter]", echo "[$counter]$HA_Row[Check_In_Date]"

但它们都不起作用。

非常感谢你！感谢你的时间。

<?php

session_start();
include_once 'dbconnect.php';

if(!isset($_SESSION['Hotel_User_ID']))
{
    header("Location: index.php");
}

    $res = mysql_query("SELECT * FROM Hotel_Info WHERE Hotel_ID =".$_SESSION['Hotel_User_ID']);
    $userRow = mysql_fetch_array($res);

    $HA_Res = mysql_query("SELECT * FROM Hotel_Account WHERE Hotel_ID =".$_SESSION['Hotel_User_ID']);
    $HA_Row = mysql_fetch_array($HA_Res);
    $HA_Count = mysql_num_rows($HA_Res);

    // echo "$HA_Count". "<br>";
    // echo "$HA_Row[Check_In_Date]";

?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Hello - <?php echo $userRow['Hotel_Email']; ?></title>
<link rel="stylesheet" href="style.css" type="text/css" />
</head>
<body>

<div id="header">
    <div id="left">
    <label>Welcome <?php echo $userRow['Hotel_Uname']; ?> </label>
    </div>
    <div id="right">
        <div id="content">
            <a href="logout.php?logout">Sign Out</a>
        </div>
    </div>
</div>

<div id="menu">
    <a href="manage.php"> Manage </a> <br>
    <a href="home.php"> Update </a>

</div>
<div id="body">
    <center>
    <div id="Hotel-InfoForm">
        <form method="post" enctype="multipart/form-data">

<!--            <table.ver2 align="center" width="60%" border="0"> -->
            <table align="center" width="85%" border = "1">
                <tr>
                <th>Check In Data</th>
                <th>Check Out Data</th> 
                <th>Theme</th>  
                <th>Bed Size</th>       
                <th>First Name</th>
                <th>Last Name</th>
                <th>Gender</th>
                <th>Age</th>
                <th>Phone Number</th>
                <th>Email</th>
                </tr>

                <?php
                for($counter = 0; $counter < $HA_Count; $counter = $counter + 1)
                {       

                    // using $counter for $HA_Row[....]

                    echo "<tr>";

                    echo "<td>";
                    echo "$HA_Row[Check_In_Date]";
                    echo "</td>";

                    echo "<td>";
                    echo "$HA_Row[Check_Out_Date]";
                    echo "</td>";

                    $Theme_Res = mysql_query("SELECT * FROM Theme WHERE Theme_ID = ".$HA_Row[Theme_ID]);
                    $Theme_Row = mysql_fetch_array($Theme_Res);

                    echo "<td>";
                    echo "$Theme_Row[Theme_Name]";
                    echo "</td>";

                    echo "<td>";
                    echo "$Theme_Row[Bed_Size]";
                    echo "</td>";

                    $Guest_Res = mysql_query("SELECT * FROM Guest_Info WHERE Guest_ID = ".$HA_Row[Guest_ID]);
                    $Guest_Row = mysql_fetch_array($Guest_Res);

                    echo "<td>";
                    echo "$Guest_Row[First_Name]";
                    echo "</td>";

                    echo "<td>";
                    echo "$Guest_Row[Last_Name]";
                    echo "</td>";

                    echo "<td>";
                    echo "$Guest_Row[Gender]";
                    echo "</td>";

                    function ageCalculator($dob)
                    {
                        if(!empty($dob))
                        {
                            $birthdate = new DateTime($dob);
                            $today   = new DateTime('today');
                            $age = $birthdate->diff($today)->y;
                            return $age;
                        }
                        else
                        {
                            return 0;
                        }
                    }

                    echo "<td>";
                    echo ageCalculator($Guest_Row[Birth_Day]);
                    echo "</td>";

                    echo "<td>";
                    echo "$Guest_Row[Phone_Num]";
                    echo "</td>";

                    echo "<td>";
                    echo "$Guest_Row[Email]";
                    echo "</td>";

                    echo "</tr>\n";

                }
                ?>
            </table>
        </form>
    </div>
    </center>
</div>
</body>
</html>

Answer 1

您可以使用mysql_fetch_assoc和while循环，如下所示：

while($HA_Row = mysql_fetch_assoc($HA_Res)){
    echo $HA_Row[Check_In_Date]."<br>";
};

这会在每个实例中循环！

Answer 2

您通常不会使用计数器来控制fetch，特别是如果您只是想按顺序处理记录。每次调用fetch都会返回结果集中的 next 行，而无需您采取进一步操作。

首先，将所有mysql_*次来电替换为mysqli_*次来电。然后替换你的行

for($counter = 0; $counter < $HA_Count; $counter = $counter + 1)

与

while ($HA_Row = mysqli_fetch_array($HA_Res))

在每个循环中，mysqli_fetch_array返回 next 行，在阅读完最后一行后，下一个调用将返回 false ，退出循环。

切换为mysqli_*或PDO也可以获得准备好的陈述，这有助于防范SQL injection以及众多其他好处。

PHP如何使用mysql_fetch_array的循环变量来指示获取数据的行？

2 个答案: