[英]php isset() function not working on form validation
我已经进行了以下验证,但对它的工作方式感到困惑。 我正在对每个字段进行标准的isset()
检查,我想为未设置的每个字段打印一条错误消息。 但是由于某种原因,它对我来说根本不起作用。
<?php
if (isset($_POST["submit"])) {
//show hr on click
$error_design = "<hr> <p id='error_msg'>Please Fix Below Errors: <p>";
$user_name = $_POST["name"];
$user_email = $_POST["email"];
$user_age = $_POST["age"];
$validation_errors = " ";
$error_counter = null;
if (isset($_POST["name"])) {
$validation_errors .= "<li class='validation_errors'>Please input your name.</li>";
$error_counter++;
}
if (isset($user_email)) {
$validation_errors .= "<li class='validation_errors'>Please input your email.</li>";
$error_counter++;
}
if (isset($user_age)) {
$validation_errors .= "<li class='validation_errors'>Please input your age.</li>";
$error_counter++;
} elseif (intval($user_age) < 18) {
$validation_errors .= "<li class='validation_errors'>You must be over 18 years old.</li>";
$error_counter++;
}
if ($error_counter = null) {
$validation_errors = "<li class='validation_success'>Message successfully sent!</li>";
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>SandBox</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<link rel="stylesheet" href="css/animate.css">
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/script.js"></script>
</head>
<body>
<header>
</header>
<form action="" method="post">
<div class="input_group">
<label for="name">Name</label>
<input type="text" name="name">
</div>
<div class="input_group">
<label for="email">eMail</label>
<input type="email" name="email">
</div>
<div class="input_group">
<label for="age">Age</label>
<input type="text" name="age">
</div>
<input type="submit" value="Send" name="submit" id="submit">
<?php echo $error_design; ?>
<div>
<ul>
<?php echo $validation_errors; ?>
</ul>
</div>
</form>
<footer></footer>
</body>
</html>
在您的情况下,您尝试检查变量是否未设置,但是在代码中实际检查变量是否已设置,因此将每个isset()
替换为if(!isset())
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