Getting Started with PHP - Verification Email and URL

PHP - Validate Name

#The following code will detect in a simple way whether the name field contains letters and spaces, if the name field value does not Legal, error message will be output

$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/ ",$name)) {
$nameErr = "Only letters and spaces allowed";
}

PHP - Verification Email

The following code will check whether the e-mail address is legal in a simple way. If the e-mail address is illegal, an error message will be output:

$email = test_input($_POST["email"]);
if (!preg_match("/([\w\-] +\@[\w\-]+\.[\w\-]+)/",$email)) {
$emailErr = "Illegal email format";
}

PHP - Verify URL

The following code will check whether the URL address is legal (the following regular expression runs in the URL containing dashes: "-"), if The URL address is illegal and an error message will be output:

$website = test_input($_POST["website"]);
if (!preg_match("/\b(?:(?:https? |ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@# \/%=~_|]/i",$website)) {
$websiteErr = "Illegal URL address";
}

PHP - Verify Name, E-mail, and URL

<?php
// 定义变量并默认设置为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
   if (empty($_POST["name"])) {
      $nameErr = "Name is required";
      } else {
         $name = test_input($_POST["name"]);
         // 检测名字是否只包含字母跟空格
         if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
         $nameErr = "只允许字母和空格"; 
         }
     }
   
   if (empty($_POST["email"])) {
      $emailErr = "Email is required";
   } else {
      $email = test_input($_POST["email"]);
      // 检测邮箱是否合法
      if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
         $emailErr = "非法邮箱格式"; 
      }
   }
     
   if (empty($_POST["website"])) {
      $website = "";
   } else {
      $website = test_input($_POST["website"]);
      // 检测 URL 地址是否合法
     if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
         $websiteErr = "非法的 URL 的地址"; 
      }
   }

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

   if (empty($_POST["gender"])) {
      $genderErr = "性别是必需的";
   } else {
      $gender = test_input($_POST["gender"]);
   }
}
?>