所以我问了一个类似的问题，但是在评论中，有人告诉我一个可能的答案，但是它没有用，所以我要发布另一个。情况略有不同，所以我不知道是否要编辑和更新另一个或新建一个。
无论如何，我有一个表单和一个PHP脚本，该脚本应该在用户提交时验证表单数据，现在（测试目的）如果未通过验证，则应打印带有字符串的数组。
在我继续之前，这里是html：
<form method="post" action="mail3.php" class="col-12" id="form-book">
<div class="row">
<div class=" form-group col-12">
<p>Fill out the form below to tell me about your problem. <strong>Any problems to do with technology, all the solutions.</strong> Just tell me what you can, however the more info you give the better.</p>
</div>
<div class="form-group col-6">
<label></label>
<input id="name" name="name" placeholder="Name" type="text" required="required" class="form-control here bottom"> <span class="error">
</div>
<div class="form-group col-6">
<label></label>
<input id="phone" name="phone" placeholder="Phone#" type="text" required="required" class="form-control here bottom"> <span class="error">
</div>
<div class="form-group col-12">
<label></label>
<input id="email" name="email" placeholder="Email (Optional)" type="text" class="form-control here bottom"> <span class="error">
</div>
<div class="form-group col-6">
<input data-provide="datepicker" id="date" name="date" placeholder="Pick a date" required="required" class="form-control here bottom">
</div>
<div class="form-group col-6">
<input type="text" id="time" name="time" placeholder="Choose the best time" required="required" class="form-control here bottom timepicker">
</div>
<div class="form-group col-12">
<label></label>
<textarea id="message" name="message" cols="40" rows="5" class="form-control" required="required" aria-describedby="messageHelpBlock"></textarea>
<span id="messageHelpBlock" class="form-text text-muted">Tell me a little about whats going on or what you need help with.</span>
</div>
<div class="form-group col-12">
<button name="submit" type="submit" class="btn btn-primary">Send your message</button>
</div>
</div>
<!--row-->
</form>
PHP：
<?php
date_default_timezone_set("Pacific/Honolulu"); //set the DateTimeZone
function test_input($data) { //test input func that checks data
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
if (isset($_POST['submit'])) {
$name = $_POST['name'];
$phone = $_POST['phone'];
$email = $_POST['email'];
$date = $_POST['date'];
$time = $_POST['time'];
$message = $_POST['message'];
$subject = "Appointment Booked";
$email = filter_var($email, FILTER_SANITIZE_EMAIL); //clean email
$mailTo = "itguy@johnpuaoi.com";
$dateTested = test_input($date);
$timeTested = test_input($time);
$errors = []; //set errors arrray
//funcs will check each input and if an error is detected it will add a string to errors array
//if no errors are found the input is then passed into xTested variable
function validateName($input) {
if (empty($input)) { //check if empty
return $errors[] = "Your name is required."; //if empty add string to errors array
} elseif (is_int($input)) { //check if input is an interger
return $errors[] = "That is not a valid name."; //if is interger add string to errors array
} else {
return $nameTested = test_input($input); //return tested input variable
}
}
function validatePhone($input) {
if (empty($input)) { //check if empty
return $errors[] = "Your phone number is required."; //add string to array if empty
} elseif (!preg_match("/^[0-9]{3}-[0-9]{4}-[0-9]{4}$/", $input)) { //check if input does not match
return $errors[] = "That is not a valid name."; //add string to array if no match
} else {
return $phoneTested = test_input($input); //return tested input variable
}
}
function validateEmail($input) {
if (empty($input)) { //check if empty
return $errors[] = "Your email is required.";//add string to array if empty
} elseif (filter_var($email, FILTER_VALIDATE_EMAIL)) {
return $errors[] = "That is not a valid email.";
} else {
return $emailTested = test_input($input); //return tested input variable
}
}
function validateMessage($input) {
if (empty($input)) { //check if empty
return $errors[] = "Your message can't be empty.";//add string to array if empty
} else {
return $messageTested = test_input($input); //return tested input variable
}
}
validateName($name); //call validate funcs
validatePhone($phone);
validateEmail($email);
validateMessage($message);
$headers = "From: ".$emailTested;
$txt = "An appointment was booked by ".$nameTested.".\n\n".$dateTested." @".$timeTested.".\n\n".$messageTested;
if ($errors == null) { //if errors array is empty
mail($mailTo, $subject, $txt, $headers); //mail data
header("Location: index.php?mailsend"); //redirect to home
} else {
print $errors; //print errors to test if validate funcs work
}
}
?>
现在，我已经为一组数据类型（名称，电子邮件，电话和消息）创建了验证功能。它检查输入，如果发生错误，则将字符串添加到错误数组。如果未发现错误，则将输入传递给变量，以告诉php它已经过错误测试。
重要：在我问的最后一个问题中，有人指出，即使数据没有通过验证，我也没有阻止邮件功能的任何措施。因此，为了解决此问题，我在底部添加了一个if语句，该语句检查errors数组是否为空。如果是，则调用邮件函数；如果不是，则出于测试目的，将打印错误数组。
我通过有意输入无效数据来测试脚本，但是无论如何都提交了表单。是什么让脚本仍然可以邮寄表单数据？
现在，如果您还不能告诉我，我是php的新手，所以请原谅我，如果我说的很简单。如果我应该只编辑第一个问题，我也表示歉意。