2

我只需要一些帮助，用这段代码创建一个 php 函数，或者换句话说，只是将这个代码包装在一个 php 函数中：

if (isset($_GET['id'])){

    $username = mysql_real_escape_string($_GET['id']);

    if(ctype_alnum($username)){

        $check = mysql_query("SELECT username,first_name FROM users WHERE username='$username'");
        if(mysql_num_rows($check)===1){

            $get = mysql_fetch_assoc($check);
            $username = $get['username'];
            $firstname = $get['first_name'];

            echo '<div id="mini_profile">This is '.$username.'\'s profile.</div>';

            }else{

            header("Location: index.php");
            exit();


            }
        }
    }

谢谢。

4

4 回答 4

4

真的很容易:)

function yourFunc() {
if (isset($_GET['id'])){

$username = mysql_real_escape_string($_GET['id']);

if(ctype_alnum($username)){

    $check = mysql_query("SELECT username,first_name FROM users WHERE username='$username'");
    if(mysql_num_rows($check)===1){

        $get = mysql_fetch_assoc($check);
        $username = $get['username'];
        $firstname = $get['first_name'];

        echo '<div id="mini_profile">This is '.$username.'\'s profile.</div>';

        }else{

        header("Location: index.php");
        exit();


        }
    }
}
}
于 2012-10-08T22:56:29.240 回答
2 
function getMyDivElement($name) {
    $username = mysql_real_escape_string($name);

    if(ctype_alnum($username)) {
        $check = mysql_query("SELECT username,first_name FROM users WHERE username='{$username}'");
        if(is_resource($check) && ($get = mysql_fetch_assoc($check))) {
            $username = $get['username'];
            $firstname = $get['first_name']; //You need this?

            return '<div id="mini_profile">This is '.$username.'\'s profile.</div>';
        }
    }

    return null;
}

//usage
if (isset($_GET['id'])) {
    $div = getMyDivElement($_GET['id']);
    if($div) {
        echo $div;
    } else {
        header("Location: index.php");
        exit();
    }
}
于 2012-10-08T23:10:07.830 回答
1

另一种方法是将 echo 语句作为字符串返回。

于 2012-10-08T23:02:29.540 回答
0

创建函数的想法是提供可重用的代码。这意味着您正在封装逻辑，允许您更改代码的内部工作而不影响函数的实际使用并避免繁琐的重复。

在您的示例中，您应该考虑属于此类别的区域。我个人可以看到这里可以实现的几个功能。

示例，不运行，但应该给你一些想法。

<?php

  function getUser($username)
  {
    if (is_string($username) && strlen($username)) {
      $query  = "
        SELECT 
          username, firstname 
        FROM 
          users 
        WHERE 
          username = :username
      ";  
      $result = executeQuery($query, array("username" => $username));
      return $result->fetch();
    }
  }

  function getDatabase($host, $db, $user, $password)
  { 
    return new PDO("mysql:host=$host;dbname=$dbname, $user, $pass");
  }

  function executeQuery($sql, array $params = array())
  {
    $db   = getDatabase();
    $conn = $db->prepare($sql);

    return $conn->execute($params);
  }

  function validateInput($input)
  {
    return ctype_alnum($input);
  }

  function advanceTo($page, $params) 
  {
    header("Location: $page.php");
    exit();
  }


if (isset($_GET["username"])){
  if (validateInput($_GET["username"])) {
    $user = getUser($_GET["username"]);
    if (! empty($user)) {
      // authUserAndSetSessionForUser($user);
      /** This page is then directed to and welcome message shown **/
      advanceTo("user-home-page", array($user));
    } else {
      advanceTo("index");
    }
  }
}

?>
于 2012-10-08T23:03:14.240 回答