PHP 使用正则表达式进行表单验证
[英]PHP form validation using regex
问题描述
在使用正则表达式的 PHP 表单验证方面需要一些帮助。 如果他们的输入无效，则应将用户重定向回 html 表单。 我的正则表达式语句在输入（ https://regex101.com/ ）时结帐，但无论输入如何，程序都会重定向到 html 表单。 这是我到目前为止的工作：
<?php
$data = $_POST;
if (trim($data['username'] == '') ||
empty($data['password']) ||
empty($data['verify_password']) ||
empty($data['email'])) {
echo "Please fill all required fields!";
header("Location:index.html");
exit;
}
if($data['password'] !== $data['verify_password']) {
echo "Passwords do not match!";
header("Location:index.html");
exit;
}
// username must be at least 8 characters long, start with a letter, end in a number, and have no special symbols.
if (!preg_match('^(?=.*[A-Za-z])[A-Za-z\d]{8,}?[0-9]+$', $username)) {
header("Location:index.html");
exit;
}
// password must be at least 8 characters long, contain at least one lower case letter, one upper case letter,
// one number, and at least one special character ( . , / ? * ! ).
if (!preg_match('^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[.,\/?*!])[A-Za-z\d.,\/?*!]{8,}$', $password)) {
header("Location:index.html");
exit;
}
// email must be at least 15 characters long, contain only one ( @ ) symbol, be a domain of gmail.com or bcit.ca,
// user portion must start with a letter, can end in a number or letter, can contain a ( . ) or ( + ), not feature any
// other special characters, and is case-insensitive.
if (!preg_match('^[a-zA-Z0-9_.+-]+@(?:(?:[a-zA-Z0-9-]+\.)?[a-zA-Z0-9]+\.)?(gmail|bcit)\.(com|ca)$', $email)) {
header("Location:index.html");
exit;
}
?>
<html>
<div>
<span>Welcome, </span><span><?php echo $data['username']; ?></span>
</div>
</html>
3 个解决方案
解决方案1
0 2022-02-03 03:56:30
您有语法错误。 if (trim($data['username'] == '')缺少右括号，应该if (trim($data['username']) == '')
我看到的第一个错误。 可能还有更多。 在您的 php.ini 中打开错误报告，您应该会看到错误正在向前发展。
解决方案2
0 2022-02-03 04:02:04
如果没有缓冲，您不应该在发送 header 之前回显任何内容。
这将不起作用：
echo "Something";
header("Location:index.html");
相反，你应该这样做：
header("Location:index.html");
echo "Something";
解决方案3
0 2022-02-03 05:14:38
第一个 $username,$email,$password 在您使用它们时未定义。 其次，您的正则表达式必须像一开始一样具有结束参数（^）。 查看完整的解决方案。
<?php
$data = $_POST;
$username = $data['username'];
$password = $data['password'];
$email = $data['email'];
if (trim($data['username'] == '') ||
empty($data['password']) ||
empty($data['verify_password']) ||
empty($data['email'])) {
echo "Please fill all required fields!";
header("Location:index.html");
exit;
}
if($data['password'] !== $data['verify_password']) {
echo "Passwords do not match!";
header("Location:index.html");
exit;
}
// username must be at least 8 characters long, start with a letter, end in a
number, and have no special symbols.
if (!preg_match('^(?=.*[A-Za-z])[A-Za-z\d]{8,}?[0-9]+$^', $username)) {
header("Location:index.html");
exit;
}
// password must be at least 8 characters long, contain at least one lower case
letter, one upper case letter,
// one number, and at least one special character ( . , / ? * ! ).
if (!preg_match('^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[.,\/?*!])[A-Za-z\d.,\/?
*!] {8,}$^', $password)) {
header("Location:index.html");
exit;
}
// email must be at least 15 characters long, contain only one ( @ ) symbol, be
a domain of gmail.com or bcit.ca,
// user portion must start with a letter, can end in a number or letter, can
contain a ( . ) or ( + ), not feature any
// other special characters, and is case-insensitive.
if (!preg_match('^[a-zA-Z0-9_.+-]+@(?:(?:[a-zA-Z0-9-]+\.)?[a-zA-Z0-9]+\.)?
(gmail|bcit)\.(com|ca)$^', $email)) {
header("Location:index.html");
exit;
}
?>
<html>
<div>
<span>Welcome, </span><span><?php echo $data['username']; ?></span>
</div>
</html>
不使用正则表达式的 PHP 验证表单
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