PHP初級練習實戰之留言板
阿新 • • 發佈：2018-07-12
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初學者做的東西，有的地方寫的不好，哈哈哈！
一.知識重點
1.三目運算 $page= empty($_GET[‘p‘]) ? 1: $_GET[‘p‘];
2.數據庫的操作mysqli的方法
3.html css js
4.字符串的拼接
5.制作分頁頁碼
6.完整驗證碼的制作
7.類的運用
8.session傳遞驗證碼的方法
初學者做的東西，有的地方寫的不好，哈哈哈！
一.知識重點
1.三目運算 $page= empty($_GET[‘p‘]) ? 1: $_GET[‘p‘];
2.數據庫的操作mysqli的方法
3.html css js
4.字符串的拼接
5.制作分頁頁碼
6.完整驗證碼的制作
7.類的運用
8.session傳遞驗證碼的方法
二 .代碼
代碼分為6個文件，liuyanbook.php為主頁
1.liuyanbook.php主界面
<?php //日期 $weekday = ["日","一","二","三","四","五","六"]; date_default_timezone_set(‘Asia/Shanghai‘); $now = getdate(time()); $week=$now[‘wday‘]; $date = date("Y年m月d日 星期$weekday[$week]"); //echo $date; //設置頁碼變量 //默認首頁p=1 $page= empty($_GET[‘p‘]) ? 1: $_GET[‘p‘]; //頁碼 $showPage = 3; //計算偏移量 $pageoffset = ($showPage-1)/2; //連接數據庫，取數據 $host = "127.0.0.1"; $dbuser = "root"; $password = ""; $dbname = "php10"; $db = new mysqli($host, $dbuser, $password, $dbname); if ($db->connect_errno != 0) { echo "連接失敗:"; echo $db->connect_error; exit; } //分頁 $db->query("set names utf8"); $limit = ($page-1) * 5; $sql = "select * from msg order by id desc limit {$limit},5"; $mysqli_result = $db->query($sql); if ($mysqli_result == false) { echo "SQL錯誤！"; exit; } //var_dump($mysqli_result); //總頁數 $total_sql = "select count(*) from msg"; $total_result = $db->query($total_sql); $total_array = mysqli_fetch_array($total_result,MYSQLI_ASSOC); $total = $total_array["count(*)"]; //echo $total; //計算頁數 $total_pages = ceil($total/5); //echo $total_pages; ?> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"/> <title>三態電子商務有限公司</title> <link rel="stylesheet" type="text/css" href="style.css"/> <script type="text/javascript"></script> </head> <body> <div class="contentout"> <div class="date"><?php echo $date;?></div> <div class="h"> <h1>三態電子商務有限公司</h1> <h2>留言板</h2> </div> <div class="all"> <div class="add"> <form action="liuyan.php" method="post"> <textarea name="content" class="content" cols="60" rows="8"></textarea><br> 留言人：<input style="padding:6px 8px"; name="user" class="user" type="text"/> <p>驗證碼圖片：<img id="captcha_img" border="1" src="str.php?r=<?php echo rand();?>" width="100px" height="30"</p> <a href="javascript:void(0)" onclick="document.getElementById(‘captcha_img‘).src=‘str.php?r=‘+Math.random()">換一個？</a> 請輸入圖片中的內容：<input style="padding:6px 8px"; type="text" name="authcode" value="" /> <input class="btn" type="submit" value="提交留言"/> </div> </form> <!--留言內容--> <?php while($row = mysqli_fetch_array($mysqli_result,MYSQLI_ASSOC)) { ?> <div class="msg"> <div class="info"> <span class="user"><?php echo $row["user"];?></span> <span class="num"><?php echo " ".$row["id"]."樓";?></span> <span class="time"><?php echo date("Y-m-d H:i:s",$row["intime"]);?></span> </div> <div class="content"> <?php echo $row["content"];?> </div> </div> <?php } ?> </div> //頁碼部分 <div class="page"> <?php $page_banner = ""; if ($page > 1) { $page_banner = "<a href=‘liuyanbook.php?p=1‘>首頁</a>"; $page_banner.= " "."<a href=‘liuyanbook.php?p=".($page-1)."‘>上一頁</a>"; } //初始化前面頁碼數據 $start = 1; $end = $total_pages; if ($total_pages > $showPage) { if($page > $pageoffset + 1) { $page_banner.="..."; } if ($page > $pageoffset) { $start = $page - $pageoffset; $end = $total_pages > $page + $pageoffset ? $page + $pageoffset : $total_pages; } else { $start = 1; $end = $total_pages > $showPage ? $showPage : $total_pages; } if ($page + $pageoffset > $total_pages) { $start = $start - ($page + $pageoffset - $total_pages); } } //顯示前面的頁碼 for($i=$start;$i<$end;$i++) { $page_banner.= " "."<a href=‘".$_SERVER[‘PHP_SELF‘]."?p=".$i."‘>{$i}</a>"; } //顯示尾部省略 if ($total_pages > $showPage && $total_pages > $page + $pageoffset) { $page_banner.="..."; } if ($page < $total_pages) { $page_banner.= " "."<a href=‘".$_SERVER[‘PHP_SELF‘]."?p=".($page+1)."‘>下一頁</a>"; $page_banner.= " "."<a href=‘liuyanbook.php?p=".$total_pages."‘>尾頁</a>"; } //頁碼部分字符拼接 $page_banner.= " "."共".$total_pages."頁"; $page_banner.= " "."共".$total."條留言"; $page_banner.= "<form action=‘liuyanbook.php‘ method=‘get‘ style= display:inline>"; $page_banner.= " "."跳轉到第<input type=‘text‘ size=‘1‘ name=‘p‘>頁"; $page_banner.= "<input type=‘submit‘ value=‘確定‘>"; $page_banner.= "</form>"; echo $page_banner; ?> </div> </div> </body> </html>
2.liuyan.php後端驗證，插入數據
<?php include(‘class_input.php‘); include(‘dbcontent.php‘); //include(‘str.php‘); $content = $_POST["content"]; $user = $_POST["user"]; $authcode = $_POST["authcode"]; //不能為空 /*if ($content == "") { die("留言內容不能為空！"); } if ($user == "") { die("請輸入留言人的姓名！"); }*/ //對輸入的內容和留言人進行檢測，不能含有李星和王瑤兩個名字 $input = new input(); //檢測顯示的結果 $is = $input->post($content); if ($is == false) { die("留言內容不能為空或者存在禁止關鍵字!"); } $is = $input->post($user); if ($is == false) { die("留言人不能為空或者存在禁止關鍵字！"); } //檢測驗證碼 $codeinput = new codeinput(); $iscode = $codeinput->check($authcode); if ($iscode == false) { die("請輸入正確的驗證碼！"); } //var_dump($content,$user); //將留言內容寫入數據庫 $time = time(); $sql = "insert into msg (content, user, intime) values (‘{$content}‘,‘{$user}‘,‘{$time}‘)"; //echo $sql; $is = $db->query($sql); //var_dump($is); header("location:liuyanbook.php");//跳回主頁 ?>
3.class_input.php兩個類，驗證關鍵字和驗證碼的類
<?php class input { function post($word) { if ($word == "") { return false; } //定義禁止使用的用戶 $name = ["李星","王瑤"]; //循環禁止使用的關鍵字，user一一與它對比 foreach ($name as $key => $value) { if ($word == $value) { return false; } } return true; } } class codeinput { function check($code) { if ($code == "") { return false; } //判斷輸入驗證碼是否正確 if (isset($code)) { session_start(); if (strtolower($code) == $_SESSION["authcode"]) { return true; } else { return false; } exit(); } } } ?>
4.dbcontent.php數據庫連接
<?php
$host = "127.0.0.1";
$dbuser = "root";
$password = "";
$dbname = "php10";
$db = new mysqli($host, $dbuser, $password, $dbname);
if ($db->connect_errno != 0) {
die("連接數據庫失敗！");
}
$db->query("set names UTF8");
?>5.str.php生成驗證碼
<?php
session_start();
header("content-type: image/png");
//生成白色底圖
$image = imagecreatetruecolor(100, 30);
$bgcolor = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $bgcolor);
//在白色底圖上生成4個彩色隨機字符
/*1.生成4個數字
for($i=0;$i<4;$i++) {
$fontsize = 6;
$fontcolor = imagecolorallocate($image, rand(0, 120), rand(0, 120), rand(0, 120));
$fontcontent = rand(0, 9);
$x = ($i*100/4) + rand(5, 10);
$y = rand(5, 10);
imagestring($image, $fontsize, $x, $y, $fontcontent, $fontcolor);
}*/
//2.生成隨機字母數字
$captch_code = "";//將生成的驗證碼存入該變量中
for($i=0;$i<4;$i++) {
$fontsize = 6;
$fontcolor = imagecolorallocate($image, rand(0, 120), rand(0, 120), rand(0, 120));
//隨機截取字母數字
$data = "abcdefghijkmnopqrstuvwxyz23456789";
$fontcontent = substr($data,rand(0,strlen($data)),1);
$captch_code.= $fontcontent;//追加到驗證碼存放
$x = ($i*100/4) + rand(5, 10);
$y = rand(5, 10);
imagestring($image, $fontsize, $x, $y, $fontcontent, $fontcolor);
}
$_SESSION["authcode"] = $captch_code;//保存到session中
//在白色底圖上生成隨機點(幹擾元素)
for($i=0;$i<200;$i++) {
$pointcolor = imagecolorallocate($image, rand(50, 200), rand(50, 200), rand(50, 200));
imagesetpixel($image, rand(1, 29), rand(1, 29), $pointcolor);
}
//在白色底圖上生成隨機線(幹擾元素)
for($i=0;$i<3;$i++) {
$linecolor = imagecolorallocate($image, rand(80, 220), rand(80, 220), rand(80, 220));
imageline($image, rand(1, 99), rand(1, 29), rand(1, 99), rand(1, 29), $linecolor);
}
imagepng($image);
imagedestroy($image);
?>6.style.css界面樣式
.all {
width: 800px;
margin: 0px auto;
}
.contentout {
width: 1000px;
margin: 0 auto;
}
.date {
text-align:right;
}
.h {
text-align:center;
}
.add {overflow: hidden;}
.add .content {
width: 98%;
padding: 6px;
margin: 0px;
font-size:20px;
}
.add .btn {
float: right;
width: 100px;
height: 40px;
font-size: 20px;
}
.msg {
margin: 10px 0px;
background: #ccc;
padding: 10px;
font-size: 18px;
}
.msg .info{overflow: hidden;}
.msg .user {
float: left;
color: blue;
}
.msg .num {
font-style: italic;
font-size: 16px;
color: red;
}
.msg .time {
float: right;
color: #999;
}
.msg .content {
width: 100%;
}
.page {
text-align:center;
font-size: 18px;
}`
`.all {
width: 800px;
margin: 0px auto;
}
.contentout {
width: 1000px;
margin: 0 auto;
}
.date {
text-align:right;
}
.h {
text-align:center;
}
.add {overflow: hidden;}
.add .content {
width: 98%;
padding: 6px;
margin: 0px;
font-size:20px;
}
.add .btn {
float: right;
width: 100px;
height: 40px;
font-size: 20px;
}
.msg {
margin: 10px 0px;
background: #ccc;
padding: 10px;
font-size: 18px;
}
.msg .info{overflow: hidden;}
.msg .user {
float: left;
color: blue;
}
.msg .num {
font-style: italic;
font-size: 16px;
color: red;
}
.msg .time {
float: right;
color: #999;
}
.msg .content {
width: 100%;
}
.page {
text-align:center;
font-size: 18px;
}三.數據庫
表格式
四.截圖界面
PHP初級練習實戰之留言板