PHP 使用 preg_match 和正则表达式进行表单验证
[英]PHP Form Validation with preg_match and regular expressions
问题描述
Hello everyone I am currently trying to validate user input in a form.
大家好，我目前正在尝试验证表单中的用户输入。 I am using regular expressions and the php preg_match function.我正在使用正则表达式和 php preg_match function。 I am trying to do this with the email, phone number, and zip code.我正在尝试使用 email、电话号码和 zip 代码来执行此操作。 However, when the user enters an email, phone number, or zip code that doesn't fit the regular expression, nothing happens, the user is supposed to get an error message when this happens.但是，当用户输入不符合正则表达式的 email、电话号码或 zip 代码时，什么也没有发生，用户应该在发生这种情况时收到错误消息。 So I believe my regular expression is not being read and I have no idea why.所以我相信我的正则表达式没有被读取，我不知道为什么。 Thank you for any help.感谢您的任何帮助。
Here is my code:这是我的代码：
<?php
if(isset($_POST['order'])){
$fname = trim(htmlspecialchars($_POST['first_name']));
echo $fname;
$address = trim(htmlspecialchars($_POST['address']));
echo $address;
$city = trim(htmlspecialchars($_POST['city']));
echo $city;
$zipcode = trim(htmlspecialchars($_POST['zip_code']));
echo $zipcode;
$email = trim(htmlspecialchars($_POST['email']));
echo $email;
$validzip = "/^\d{5}$|^\d{5}-\d{4}$/";
$validemail = "/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/";
$state = $_POST['states'];
echo $state;
$lname = trim(htmlspecialchars($_POST['last_name']));
echo $lname;
$phonenumber = trim(htmlspecialchars($_POST['phone_number']));
echo $phonenumber;
$vaildpn = "/^[0-9]{3}-[0-9]{4}-[0-9]{4}$/";
if(isset($_POST['first_name']) && $fname!= "" && isset($_POST['address'])&& $address !="" && isset($_POST['city']) && $city != "" && isset($_POST['zip_code']) && $zipcode != ""&& isset($_POST['email']) && $email != "" && isset($_POST['last_name']) && $lname != "" && isset($_POST['phone_number']) && $phonenumber != "" && isset($_POST['card_Number']) && $cardnumber != "" && isset($_POST['exp_date']) && $expdate != "" && isset($_POST['cvc']) && $cvc != "" && preg_match($validzip, $zipcode) && preg_match($validemail, $email)){
header("Location: orderplaced.php");
}
} }
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Confrimation</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="shortcut icon" href="images/favicon.ico">
<link rel="stylesheet" href="css/normalize.css">
<link rel="stylesheet" href="css/confirm.css">
</head>
<body>
<header>
<h1>Order Confrimation</h1>
</header>
<main>
<nav>
<ul>
<form action="cart.php">
<li><button type="submit" name="back" value="Back to Cart">Back to Cart</button></li>
</form>
<form action="index.php">
<li><button type="submit" action="index.php" name="shopping">Return to Shopping</button></li>
</form>
</ul>
</nav>
<form method="post" name="shipping" action="confirm.php">
<h2>Please enter your shipping information:</h2>
<label for="fname">First Name:</label>
<input type="text" id="fname" name="first_name"
<?php
if(isset($_POST['first_name'])&& $fname==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['fname'])){
echo "value=$fname>";
}
else{
echo"><span>*</span>";
}
?>
<input type="hidden" name="fname2" value="<?php echo "$fname2"; ?>" />
<br>
<label for="lname">Last Name:</label>
<input type="text" id="lname" name="last_name"
<?php
if(isset($_POST['last_name'])&& $lname==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['lname'])){
echo "value=$lname>";
}
else{
echo"><span>*</span>";
}
?>
<br>
<label for="email">Email:</label>
<input type="text" id="email" name="email"
<?php
if(isset($_POST['email'])&& $email==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['email'])){
echo "value=$email>";
}
else if(isset($_POST['email']) && !preg_match($validemail, $email)){
echo "value=$email>";
echo "<span>Please enter a vaild email</span>";
}
else{
echo"><span>*</span>";
}
?>
<br>
<label for="address">Address:</label>
<input type="text" id="address" name="address"
<?php
if(isset($_POST['address'])&& $address==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['address'])){
echo "value=$address>";
}
else{
echo"><span>*</span>";
}
?><br>
<label for ="state">State</label>
<select name="states">
<option value="AL"<?php echo (isset($_POST['states']) && $_POST['states'] == 'AL') ? 'selected="selected"' : ''; ?>>Alabama</option>
<option value="AK"<?php echo (isset($_POST['states']) && $_POST['states'] == 'AK') ? 'selected="selected"' : ''; ?>>Alaska</option>
<option value="AZ"<?php echo (isset($_POST['states']) && $_POST['states'] == 'AZ') ? 'selected="selected"' : ''; ?>>Arizona</option>
<option value="AR"<?php echo (isset($_POST['states']) && $_POST['states'] == 'AR') ? 'selected="selected"' : ''; ?>>Arkansas</option>
<option value="CA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'CA') ? 'selected="selected"' : ''; ?>>California</option>
<option value="CO"<?php echo (isset($_POST['states']) && $_POST['states'] == 'CO') ? 'selected="selected"' : ''; ?>>Colorado</option>
<option value="CT"<?php echo (isset($_POST['states']) && $_POST['states'] == 'CT') ? 'selected="selected"' : ''; ?>>Connecticut</option>
<option value="DE"<?php echo (isset($_POST['states']) && $_POST['states'] == 'DE') ? 'selected="selected"' : ''; ?>>Delaware</option>
<option value="FL"<?php echo (isset($_POST['states']) && $_POST['states'] == 'FL') ? 'selected="selected"' : ''; ?>>Florida</option>
<option value="GA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'GA') ? 'selected="selected"' : ''; ?>>Georgia</option>
<option value="HI"<?php echo (isset($_POST['states']) && $_POST['states'] == 'HI') ? 'selected="selected"' : ''; ?>>Hawaii</option>
<option value="ID"<?php echo (isset($_POST['states']) && $_POST['states'] == 'ID') ? 'selected="selected"' : ''; ?>>Idaho</option>
<option value="IL"<?php echo (isset($_POST['states']) && $_POST['states'] == 'IL') ? 'selected="selected"' : ''; ?>>Illinois</option>
<option value="IN"<?php echo (isset($_POST['states']) && $_POST['states'] == 'IN') ? 'selected="selected"' : ''; ?>>Indiana</option>
<option value="IA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'IA') ? 'selected="selected"' : ''; ?>>Iowa</option>
<option value="KS"<?php echo (isset($_POST['states']) && $_POST['states'] == 'KS') ? 'selected="selected"' : ''; ?>>Kansas</option>
<option value="KY"<?php echo (isset($_POST['states']) && $_POST['states'] == 'KY') ? 'selected="selected"' : ''; ?>>Kentucky</option>
<option value="LA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'LA') ? 'selected="selected"' : ''; ?>>Louisiana</option>
<option value="ME"<?php echo (isset($_POST['states']) && $_POST['states'] == 'ME') ? 'selected="selected"' : ''; ?>>Maine</option>
<option value="MD"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MD') ? 'selected="selected"' : ''; ?>>Maryland</option>
<option value="MA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MA') ? 'selected="selected"' : ''; ?>>Massachusetts</option>
<option value="MI"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MI') ? 'selected="selected"' : ''; ?>>Michigan</option>
<option value="MN"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MN') ? 'selected="selected"' : ''; ?>>Minnesota</option>
<option value="MS"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MS') ? 'selected="selected"' : ''; ?>>Mississippi</option>
<option value="MO"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MO') ? 'selected="selected"' : ''; ?>>Missouri</option>
<option value="MT"<?php echo (isset($_POST['states']) && $_POST['states'] == 'MT') ? 'selected="selected"' : ''; ?>>Montana</option>
<option value="NE"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NE') ? 'selected="selected"' : ''; ?>>Nebraska</option>
<option value="NV"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NV') ? 'selected="selected"' : ''; ?>>Nevada</option>
<option value="NH"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NH') ? 'selected="selected"' : ''; ?>>New Hampshire</option>
<option value="NJ"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NJ') ? 'selected="selected"' : ''; ?>>New Jersey</option>
<option value="NM"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NM') ? 'selected="selected"' : ''; ?>>New Mexico</option>
<option value="NY"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NY') ? 'selected="selected"' : ''; ?>>New York</option>
<option value="NC"<?php echo (isset($_POST['states']) && $_POST['states'] == 'NC') ? 'selected="selected"' : ''; ?>>North Carolina</option>
<option value="ND"<?php echo (isset($_POST['states']) && $_POST['states'] == 'ND') ? 'selected="selected"' : ''; ?>>North Dakota</option>
<option value="OH"<?php echo (isset($_POST['states']) && $_POST['states'] == 'OH') ? 'selected="selected"' : ''; ?>>Ohio</option>
<option value="OK"<?php echo (isset($_POST['states']) && $_POST['states'] == 'OK') ? 'selected="selected"' : ''; ?>>Oklahoma</option>
<option value="OR"<?php echo (isset($_POST['states']) && $_POST['states'] == 'OR') ? 'selected="selected"' : ''; ?>>Oregon</option>
<option value="PA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'PA') ? 'selected="selected"' : ''; ?>>Pennsylvania</option>
<option value="RI"<?php echo (isset($_POST['states']) && $_POST['states'] == 'RI') ? 'selected="selected"' : ''; ?>>Rhode Island</option>
<option value="SC"<?php echo (isset($_POST['states']) && $_POST['states'] == 'SC') ? 'selected="selected"' : ''; ?>>South Carolina</option>
<option value="SD"<?php echo (isset($_POST['states']) && $_POST['states'] == 'SD') ? 'selected="selected"' : ''; ?>>South Dakota</option>
<option value="TN"<?php echo (isset($_POST['states']) && $_POST['states'] == 'TN') ? 'selected="selected"' : ''; ?>>Tennessee</option>
<option value="TX"<?php echo (isset($_POST['states']) && $_POST['states'] == 'TX') ? 'selected="selected"' : ''; ?>>Texas</option>
<option value="UT"<?php echo (isset($_POST['states']) && $_POST['states'] == 'UT') ? 'selected="selected"' : ''; ?>>Utah</option>
<option value="VT"<?php echo (isset($_POST['states']) && $_POST['states'] == 'VT') ? 'selected="selected"' : ''; ?>>Vermont</option>
<option value="VA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'VA') ? 'selected="selected"' : ''; ?>>Virginia</option>
<option value="WA"<?php echo (isset($_POST['states']) && $_POST['states'] == 'WA') ? 'selected="selected"' : ''; ?>>Washington</option>
<option value="WV"<?php echo (isset($_POST['states']) && $_POST['states'] == 'WV') ? 'selected="selected"' : ''; ?>>West Virginia</option>
<option value="WI"<?php echo (isset($_POST['states']) && $_POST['states'] == 'WI') ? 'selected="selected"' : ''; ?>>Wisconsin</option>
<option value="WY"<?php echo (isset($_POST['states']) && $_POST['states'] == 'WY') ? 'selected="selected"' : ''; ?>>Wyoming</option>
</select>
<label for ="city">City:</label>
<input type="text" id="city" name="city"
<?php
if(isset($_POST['city'])&& $city==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['city'])){
echo "value=$city>";
}
else{
echo"><span>*</span>";
}
?>
<br>
<label for ="zipcode">Zip Code:</label>
<input type="text" id="zipcode" name="zip_code"
<?php
if(isset($_POST['zip_code'])&& $zipcode==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['zip_code'])){
echo "value=$zipcode>";
}
else if(isset($_POST['zip_code'])&& !preg_match($validzip, $zipcode) ){
echo "value=$zipcode>";
echo "<span>Please enter a vaild zip-code</span>";
}
else{
echo"><span>*</span>";
}
?>
<br>
<label for ="phonenumber">Phone Number:</label>
<input type="text" id="phonenumber" name="phone_number"
<?php
if(isset($_POST['phone_number'])&& $phonenumber==""){
echo"><span>This field is required</span>";
}
else if(isset($_POST['phone_number'])){
echo "value=$phonenumber>";
}
else if(isset($_POST['phone_number'])&& !preg_match($vaildpn, $phonenumber)){
echo "value=$phonenumber>";
echo "<span>Invaild Phone Number, please enter between 7-10 digts</span>";
}
else{
echo"><span>*</span>";
}
?>
<button type="submit" name="order" id="order" value="Checkout">Checkout</button>
</form>
</main>
<footer>
Sierra Sprungl – CS3800 Final Project - Spring 2020
</footer>
1 个解决方案
解决方案1
0 已采纳 2020-04-07 03:33:58
There is no $_POST['order'] being submitted.没有提交$_POST['order'] 。 Try adding this to your form:尝试将此添加到您的表单中：
<input type="hidden" value="1" name="order">
I would also advise you to use better validation methods like filter_var我还建议您使用更好的验证方法，例如filter_var
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