The best PHP Forms - verification message and URL Tutorial In 2024, In this tutorial you can learn PHP - verify the name,PHP - verification message,PHP - validate the URL,PHP - verify the Name, E-mail, and URL,
This section will describe how to verify names (name), e-mails (spam), and URLs.
The following code will be a simple way to detect whether the field name contains letters and spaces, if the name field value is not legitimate, will output an error message:
$name = test_input($_POST["name"]); if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允许字母和空格"; }
preg_match - Perform a regular expression match. grammar: int preg_match (string $ pattern, string $ subject [, array $ matches [, int $ flags]]) Being subject string search pattern that matches the regular expression given content. If a matches, then the results of the search will be filled. $ Matches [0] will contain the text of the entire pattern matches, $ matches [1] will contain the first captured subpattern parentheses matched text, and so on. |
The following code will be a simple way to detect e-mail address is valid. If the e-mail address is not valid, will output an error message:
$email = test_input($_POST["email"]); if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "非法邮箱格式"; }
The following code will detect the URL is legitimate (following regular expression operation URL contains a dash: "-"), if the URL address is not valid, will output an error message:
$website = test_input($_POST["website"]); if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { $websiteErr = "非法的 URL 的地址"; }
Code as follows:
<?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"]); } } ?>