Question

我正在接受以下php代码中的问题。我在第146行（echo $ newrecord）变量中收到了一个未知的变量错误。我不确定这个变量有什么问题，我已经在IF语句中定义了它，如果成功的话我只是回声。我最初在脚本的顶部有代码段（后面），但它导致了必须显示正确的字段错误消息的问题。任何帮助表示赞赏！

<!DOCTYPE HTML>  
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>  

<?php
// define variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = $subErr = "";
$name = $email = $gender = $comment = $website = $sub = $newrecord = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["Name"])) {
    $nameErr = "Name is required";
  } else {
    $name = test_input($_POST["Name"]);
    // check if name only contains letters and whitespace
    if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
      $nameErr = "Only letters and white space allowed"; 
    }
  }

  if (empty($_POST["Email"])) {
    $emailErr = "Email is required";
  } else {
    $email = test_input($_POST["Email"]);
    // check if e-mail address is well-formed
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
      $emailErr = "Invalid email format"; 
    }
  }

  if (empty($_POST["Website"])) {
    $website = "";
  } else {
    $website = test_input($_POST["Website"]);
    // check if URL address syntax is valid (this regular expression also allows dashes in the URL)
    if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
      $websiteErr = "Invalid URL"; 
    }
  }

  if (empty($_POST["Comment"])) {
    $comment = "";
  } else {
    $comment = test_input($_POST["Comment"]);
  }

  if (empty($_POST["gender"])) {
    $genderErr = "Gender is required";
  } else {
    $gender = test_input($_POST["gender"]);
  }

if (empty($_POST["Subscription"])) {
    $subErr = "Subscription is required"; }
 else {
    $sub = test_input($_POST["Subscription"]);
    }
}

function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>

<h2>Southern Tier Daily News</h2>
<form method="post" action="Newspaper3.php">
<input type="hidden" name="submitted" value="true"/>

<img src="https://bloximages.newyork1.vip.townnews.com/dnews.com/content/tncms/custom/image/5eec4204-483e-11e6-93c8-97ef236dc6c5.jpg?_dc=1468334339" alt="HTML5 Icon" style="width:128px;height:128px;">
    <p><span class="error">* required field.</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<fieldset>
 <legend>Newspaper Subscription Request</legend>  
  Name: <input type="text" name="Name" value="<?php echo $name;?>">
  <span class="error">* <?php echo $nameErr;?></span>
  <br><br>
  E-mail: <input type="text" name="Email" value="<?php echo $email;?>">
  <span class="error">* <?php echo $emailErr;?></span>
  <br><br>
  Website: <input type="text" name="Website" value="<?php echo $website;?>">
  <span class="error"><?php echo $websiteErr;?></span>
  <br><br>
  Comment: <textarea name="Comment" rows="5" cols="40"><?php echo $comment;?></textarea>
  <br><br>
  Gender:
  <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female
  <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">Male
  <span class="error">* <?php echo $genderErr;?></span>
    <br><br>
  Subscription:
   <select name="Subscription">
       <option value=""></option>
   <option value="Daily">Daily</option>
   <option value="Evening">Evening</option>
   <option value="Weekly">Weekly</option>
   <option value="Monthly">Monthly</option>
</select> 
  <span class="error">* <?php echo $subErr;?></span>

  <br><br>
  <input type="submit" name="submit" value="Submit"> 
<br><br>
<a href="https://www.google.com/">Visit Admin Page</a>
 </fieldset>
</form>

<?php
echo "<h2>Your Input:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
echo "<br>";
echo $sub;
?>

<?php

if (isset($_POST['submitted'])) {

include('connect-mysql.php');

$fname = $_POST['Name'];
$femail = $_POST['Email'];
$fcomment = $_POST['Comment'];
$fsubsciption = $_POST['Subscription'];
$sqlinsert = "INSERT INTO newspaper (Name, Email, Comment, Subscription) VALUES ('$fname',
'$femail', '$fcomment', '$fsubsciption')";

      if (!mysqli_query($dbcon, $sqlinsert))  {
           die('error inserting new record');       

  }     // end of nested if statement

        $newrecord = "1 record added to the database";

}  // end of main if statement

?>

<?php

echo $newrecord

?>



</body>
</html>

Answer 1

.card { background-color: yellow; } .card-status-true { background-color: #00FF44; } .card-status-false { background-color: #C4C4CC; } .card.card-active { background-color: #fff !important; border-color: yellow; } .card.card-active.card-status-true { background-color: #fff !important; border-color: #00FF44; } .card.card-active.card-status-false { background-color: #fff !important; border-color: gray; }已在newrecord语句中定义和初始化，因此，如果您的代码选择了其他内容，则会跳过if并且您的if变量不会存在。

Answer 2

$newrecord在if语句中定义，当if未执行时，变量不可用。您可以在启动if之前默认添加$newrecord = '';来定义它。

PHP脚本中的Defined Variable具有未定义的变量错误

2 个答案: