Form verification email and URL
In this chapter we will introduce how to verify names, e-mails, and URLs.
PHP - Verify name
The following code will detect whether the name field contains letters and spaces in a simple way. If the name field value is illegal, an error message will be output:
$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "只允许字母和空格";
} | ##preg_match — Perform regular expression matching. Syntax: int preg_match ( string $pattern , string $subject [, array $matches [, int $flags ]] ) at Search the subject string for content that matches the regular expression given by pattern. If matches is provided, it will be populated with the results of the search. $matches[0] will contain text that matches the entire pattern, $matches[1] will contain text that matches the first captured subpattern in parentheses, and so on. |
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PHP - Verification EmailThe following code will check whether the e-mail address is legitimate 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 = "非法邮箱格式";
}The following code will detect the URL Whether the address is legal (the following regular expression operation URL contains dashes: "-"). If the URL address is illegal, 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 = "非法的 URL 的地址";
}PHP - Verify Name, E-mail, and URL
The code is 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"]);
}
}
?>Running example»
