php实现简单表单代码

$message_name=$message_email="";

$m_name=$m_email=true;

$name=$email="";

if($_SERVER["REQUEST_METHOD"]=="POST")

{

if(empty($_POST["name"])){

$message_name="姓名是必填的";

$m_name=false;

}else{

$name=text_input($_POST["name"]);

if(!preg_match("/^[0-9a-zA-Z]*$/",$name))

{

$message_name="姓名只能是数字和字母";

$m_name=false;

}

}

if(empty($_POST["name"])){

$message_email="电子邮箱是必填的";

$m_email=false;

}else{

$email=text_input($_POST["email"]);

if(!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))

{

$message_email="电子邮箱格式不正确";

$m_email=false;

}

}

}

function text_input($data){

$data=trim($data);

$data=stripcslashes($data);

$data=htmlspecialchars($data);

return $data;

}

?>

">

if(isset($_POST["submit"])&&$m_name&&$m_email){

echo '

echo '

}

?>

附：

// 模式定界符后面的 "i" 表示不区分大小写字母的搜索 

if (preg_match ("/hi/i", "Welcome to hi-docs.com.")) { 

  echo "A match was found."; 

 } else { 

  echo "A match was not found."; 

 } 

 ?>