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PHP 表单 – 验证邮件和URL

以下代码将通过简单的方式来检测 name 字段是否包含字母和空格,如果 name 字段值不合法,将输出错误信息:

$name = test_input($_POST[“name”]);
if (!preg_match(“/^[a-zA-Z ]*$/”,$name))
{
$nameErr = “只允许字母及空格”;
}

 

Note preg_match — 进行正则表达式匹配。

语法:
int preg_match ( string $pattern , string $subject [, array $matches [, int $flags ]] )
在 subject 字符串中搜索与 pattern 给出的正则表达式相匹配的内容。如果提供了 matches ,则其会被搜索的结果所填充。$matches[0] 将包含与整个模式匹配的文本,$matches[1] 将包含与第一个捕获的括号中的子模式所匹配的文本,以此类推。

 


PHP – 验证邮件

以下代码将通过简单的方式来检测 e-mail 地址是否合法。如果  e-mail 地址不合法,将输出错误信息:

$email = test_input($_POST[“email”]);
if (!preg_match(“/([\w\-]+\@[\w\-]+\.[\w\-]+)/”,$email))
{
$emailErr = “非法邮件地址”;
}

 


PHP – 验证 URL

以下代码将检测URL地址是否合法 (以下正则表达式运行URL中含有破折号:”-“), 如果 URL 地址不合法,将输出错误信息:

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

 


PHP – 验证 Name, E-mail, 和 URL

代码如下所示:

实例

<?php
// 定义变量并设为空值
$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”]);
// check if name only contains letters and whitespace
if (!preg_match(“/^[a-zA-Z ]*$/”,$name))
{
$nameErr = “Only letters and white space allowed”;
}
}

if (empty($_POST[“email”]))
{$emailErr = “Email is required”;}
else
{
$email = test_input($_POST[“email”]);
// check if e-mail address syntax is valid
if (!preg_match(“/([\w\-]+\@[\w\-]+\.[\w\-]+)/”,$email))
{
$emailErr = “Invalid email format”;
}
}

if (empty($_POST[“website”]))
{$website = “”;}
else
{
$website = test_input($_POST[“website”]);
// check if URL address syntax is valid (this regular expression also allows dashes in the URL)
if (!preg_match(“/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i”,$website))
{
$websiteErr = “Invalid URL”;
}
}

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

if (empty($_POST[“gender”]))
{$genderErr = “Gender is required”;}
else
{$gender = test_input($_POST[“gender”]);}
}
?>


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