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2014-04-22 06:35
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PHP MySQL警告:mysqli_fetch_array()期望参数1为mysqli_result [duplicate]

This is my PHP code :

<html>
    <head>  
        <title>SQL DB Management</title>
    </head>
    <body>
        <h1>MySqlAdmin</h1>
        <table>
            <tr>
                <th><!--Heading 1--></th>
                <th><!--Heading 2--></th>
                <th><!--Leave it blank--></th>
            </tr>
        <?php
            $db_host = "mysql.freehostingnoads.net";
            $db_username = "";
            $db_password = "";
            $db_name = "";
            $db_table = "";
            $db = mysqli_connect($db_host, $db_username, $db_password, $db_name);
            if (mysqli_connect_errno()){die("Failed to connect to MySQL: " . mysql_connect_error());}
            $content = mysqli_query($db,"SELECT * FROM " . $db_table);

            while($line = mysqli_fetch_array( $content )){
                echo("<tr>");
                echo("<td>" . $line['c1'] . "</td>");
                echo("<td>" . $line['c2'] . "</td>");
                #delete button
                echo("<td><form action='del.php' method='GET'><input type='text' name='c1' value='" . $line['c1'] . "' /><input type='text' name='c2' value='" . $line['c2'] . "' /><input type='button' value='DEL' /></form></td>");
                echo("</tr>");
            }
        ?>
    </body>
</html>

And simply skip reading the <head>, this is the warning I received:

Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in /home/u273577101/public_html/index.php on line 23

I have searched but cannot find the answer. What's the problem here?
There is no connection error, I guess. It doesn't seem to give me any error message about connecting.

</div>
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