使用PHP生成随机数据

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我正在开发一个应用程序，它有一个问题库，通过它我想随机生成问题论文。我正在使用PHP和HTML。我使用html作为我的前端和后端PHP。我已开发的代码，但是有一个问题，它，它产生4 textarea的2个问题，我无法调试它使用PHP生成随机数据

<?php 
$servername = "localhost"; 
$username = "root"; 
$password = "root"; 
$dbname = "rgpv"; 

$conn = new mysqli($servername, $username, $password, $dbname); 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 

$sql = "SELECT ques FROM bank WHERE sub='$_POST[sub]' ORDER BY RAND() LIMIT 2"; 
$result = $conn->query($sql); 


$result = $conn->query($sql); 

    // output data of each row 
    while($row = $result->fetch_assoc()) { 


     ?> 

<!DOCTYPE html> 
<html > 
    <head> 
    <meta charset="UTF-8"> 
    <title>Login Form</title> 

     <!-- Calling CSS --> 
     <link rel="stylesheet" href="css/reset.css"> 
     <link rel='stylesheet prefetch' href='http://fonts.googleapis.com/css?family=Roboto:400,100,300,500,700,900|RobotoDraft:400,100,300,500,700,900'> 

     <!--File for fonts--> 
     <link rel='stylesheet prefetch' href='css/bootstrap.css'> 
     <link rel='stylesheet prefetch' href='css/font-awesome.min.css'> 
     <link rel="stylesheet" href="css/style.css"> 
    </head> <!-- end Head --> 

    <body background="images/journal.jpg"> 
    <!-- Mixins--> 
     <!-- Form Title--> 
    <div class="pen-title"> 
     <h1>University Institute of Technology- RGPV</h1><h2>Random Question Paper Generator Portal</h2> 
</div> 


     <fieldset class="form-group"> 
    <label for="exampleTextarea">Question 1</label> 
    <textarea class="form-control txt" id="name" rows="3" value="" disabled><?php echo $row["ques"]; ?></textarea> 
    </fieldset> 


     <fieldset class="form-group"> 
    <label for="exampleTextarea">Question 2</label> 
    <textarea class="form-control txt" id="name" rows="3" value="" disabled><?php echo $row["ques"]; ?></textarea> 
    </fieldset> 


    </body> 
</html> 

<?php 

} 

?>

来源

2016-05-14 Kushagra Varade

你可以从mysql中随机获取数据。如果你想随机使用PHP，那么试试rand函数。 –

您想让我们为您写信还是猜测？ –

呃..Buddy你想要一些像现成的面包，为你的早餐？ –

使用功能，像你的数据库这个&拉数据：

当过你怎么称呼它，如：UniqueRandomNumbersWithinRange(0,25,5)

你会得到混乱的数字$min之间的阵列$quantity到$max。

从后端只需按照数组顺序提取问题。

来源

2016-05-14 15:34:56

<?php 

function get_question() 
{ 

    // Connect to your database storing your questions 
    $connection = new mysqli("hostname", "username", "password", "database"); 

    if($connection->connect_errno) 
    { 
    die("Error connecting to database."); 
    } 

    // Load all your questions from your database into an array 
    $query = "SELECT * FROM questions"; 
    $result = $connection->query($query); 
    $questions = $result->fetch_all(); 

    // Randomly select a question from your array to output 
    $number = rand(0, count($questions) - 1); 
    return $questions[$number]; 
} 

$question = get_question(); 

// Use var_dump() to view the raw output from your database 
// You can now output your question and format it however you'd like 
var_dump($question); 

// You can call this function as many times as you'd like using a loop 
for($i = 0; $i < 10; $i++) 
{ 
    $question = get_question(); 
    // Output your question properly formatted here 
} 
?>

来源

2016-05-14 16:00:47 aylnon

使用PHP生成随机数据

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