使用$ _POST验证html/PHP字段中的重复条目

Question

paper_add.php是一种用于将值发布到名为paper_entry.php的另一个php页面的html表单。

我想使用验证不允许重复的条目进入数据库，而是会给他们错误信息，其中一些值是重复的。

我试过比较字符串，但它只适用于有2个变量，我也试过使用in_array()，但没有奏效。我发布了两个页面，以便任何人都可以指引我走向正确的方向，我会非常高兴并继续我的项目。

我想确保q1q1是不一样的Q1Q2等之前，我允许它被插入到数据库

<?php include 'header.php'; ?> 
<div class="container"> 
    <table class="table table-bordered"> 
     <thead> 
      <tr> 
       <th colspan='2'><u>Add Paper</u></th> 
      </tr> 
     </thead> 
     <tbody> 
      <form method="post" action="paper_entry.php"> 
      <tr> 
       <td>Examination </td> 
       <td><input type="text" required="required" class="form-control" name="examination"></td> 
      </tr> 
      <tr> 
       <td>Subject </td> 
       <td><input type="text" required="required" class="form-control" name="subject"></td> 
      </tr> 
      <tr> 
       <td>Subject Code </td> 
       <td><input type="text" required="required" class="form-control" name="subject_code"></td> 
      </tr> 
      <tr> 
       <td>Category</td> 
       <td><input type="text" required="required" class="form-control" name="category"></td> 
      </tr> 
      <tr> 
       <td>Month & Year:</td> 
       <td><input type="text" required="required" class="form-control" name="month_year"></td> 
      </tr> 
      <input type="hidden" required="required" class="form-control" name="created_by" value="<?php echo $_SESSION ['user'] ?>"> 
      <tr> 
       <td>Question 1 (1) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q1"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (2) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q2"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (3) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q3"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (4) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q4"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (5) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q5"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (6) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q6"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (7) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q7"></td> 
      </tr> 
      <tr> 
       <td>Question 1 (8) :</td> 
       <td><input type="text" required="required" class="form-control" name="q1q8"></td> 
      </tr> 
      <tr> 
       <td>Question 2 (A) :</td> 
       <td><input type="text" required="required" class="form-control" name="q2qa"></td> 
      </tr> 
      <tr> 
       <td>Question 2 (B) :</td> 
       <td><input type="text" required="required" class="form-control" name="q2qb"></td> 
      </tr> 
      <tr> 
       <td>Question 2 (Or A) :</td> 
       <td><input type="text" required="required" class="form-control" name="q2qoa"></td> 
      </tr> 
      <tr> 
       <td>Question 2 (Or B) :</td> 
       <td><input type="text" required="required" class="form-control" name="q2qob"></td> 
      </tr> 
      <tr> 
       <td>Question 3 (A) :</td> 
       <td><input type="text" required="required" class="form-control" name="q3qa"></td> 
      </tr> 
      <tr> 
       <td>Question 3 (B) :</td> 
       <td><input type="text" required="required" class="form-control" name="q3qb"></td> 
      </tr> 
      <tr> 
       <td>Question 3 (Or B) :</td> 
       <td><input type="text" required="required" class="form-control" name="q3qob"></td> 
      </tr> 
      <tr> 
       <td>Question 4 (A) :</td> 
       <td><input type="text" required="required" class="form-control" name="q4qa"></td> 
      </tr> 
      <tr> 
       <td>Question 4 (B) :</td> 
       <td><input type="text" required="required" class="form-control" name="q4qb"></td> 
      </tr> 
      <tr> 
       <td>Question 5 (1) :</td> 
       <td><input type="text" required="required" class="form-control" name="q5q1"></td> 
      </tr> 
      <tr> 
       <td>Question 5 (2) :</td> 
       <td><input type="text" required="required" class="form-control" name="q5q2"></td> 
      </tr> 
      <tr> 
       <td>Question 5 (3) :</td> 
       <td><input type="text" required="required" class="form-control" name="q5q3"></td> 
      </tr> 
      <tr> 
       <td>Submit : </td> 
       <td><input type="submit" name="submit"></td> 
      </tr> 
     </tbody> 
    </table> 
</div> 

paper_entry.php

<?php 
include 'header1.php'; 
$examination = $_POST["examination"]; 
$subject  = $_POST["subject"]; 
$subject_code = $_POST["subject_code"]; 
$category  = $_POST["category"]; 
$month_year = $_POST["month_year"]; 
$created_by = $_POST["created_by"]; 

$q1q1 = $_POST["q1q1"]; 
$q1q2 = $_POST["q1q2"]; 
$q1q3 = $_POST["q1q3"]; 
$q1q4 = $_POST["q1q4"]; 
$q1q5 = $_POST["q1q5"]; 
$q1q6 = $_POST["q1q6"]; 
$q1q7 = $_POST["q1q7"]; 
$q1q8 = $_POST["q1q8"]; 
$q2qa = $_POST["q2qa"]; 
$q2qb = $_POST["q2qb"]; 
$q2qoa = $_POST["q2qoa"]; 
$q2qob = $_POST["q2qob"]; 
$q3qa = $_POST["q3qa"]; 
$q3qb = $_POST["q3qb"]; 
$q3qob = $_POST["q3qob"]; 
$q4qa = $_POST["q4qa"]; 
$q4qb = $_POST["q4qb"]; 
$q5q1 = $_POST["q5q1"]; 
$q5q2 = $_POST["q5q2"]; 
$q5q3 = $_POST["q5q3"]; 

include 'dbconnect.php'; 

$sql = "INSERT INTO paper (id , examination, subject,subject_code,category,month_year,created_by,q1q1,q1q2,q1q3,q1q4,q1q5,q1q6,q1q7,q1q8,q2qa,q2qb,q2qoa,q2qob,q3qa,q3qb,q3qob,q4qa,q4qb,q5q1,q5q2,q5q3) 
      VALUES ('','$examination','$subject','$subject_code','$category','$month_year','$created_by','$q1q1','$q1q2','$q1q3','$q1q4','$q1q5','$q1q6','$q1q7','$q1q8','$q2qa','$q2qb','$q2qoa','$q2qob','$q3qa','$q3qb','$q3qob','$q4qa','$q4qb','$q5q1','$q5q2','$q5q3')"; 

if (mysqli_query($conn, $sql)) { 
    echo "<center> <h2><a href='paper_list.php'> Paper Added, Click Here For List. </h2> </center></a>"; 
} else { 
    echo "Error: " . $sql . "<br>" . mysqli_error($conn); 
} 

include 'footer.php'; 
?> 

Answer 1

你可以做类似：

$post_array = [ 
     'q1q1' => 'test ', 
     'q1q2' => 'testing', 
     'q1q3' => 'test', 
     'q2qa' => 'tester', 
     'q2qoa' => 'test2', 
     'q3qob' => 'tests' 
    ]; 

$keys = array_keys($post_array); 

foreach ($keys as $key) { 
    foreach ($post_array as $k => $v) { 
     if ($key != $k) { 
      if (trim(strtolower($v)) == trim(strtolower($post_array[$key]))) { 
       echo "The value '{$v}' in {$key} matches the value in {$k}<br />"; 
      } 
     } else { 
      continue; 
     } 
    } 
} 

我有一个肠道f eeling array_reduce会更好，但是这应该可以工作，你需要修改它以适应你的post数组，我刚刚在这里添加了默认值作为例子。你也可以用Javascript做类似的方法来做它的客户端。

它所做的就是循环你的文章数组的关键字，然后检查其他项目的值，以跳过它所比较的​​项目。这意味着你会得到每个重复的结果，但我想你会想要在所有比赛中添加警告？

无论如何，希望它有助于让您更接近解决方案。