php网站开发

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前后台交互(无ajax等框架)

add.html

<!DOCTYPE html><html><head lang="en"><meta charset="UTF-8"><title>相加</title></head><body><!--GET是从服务器上获取数据（地址栏显示参数，不安全）。 --><!--POST是向服务器传送数据(地址栏不显示参数，更安全)。--><form action="add.php" method="post">    a:<input type="text" name="a"><br>    b:<input type="text" name="b"><br>    <input type="submit" value="提交"></form></body></html>

add.php

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>相加</title></head><body><?phpif($_POST['a']&&$_POST['b']){    echo $_POST['a']+$_POST['b'];}else{    echo "提交错误";//含有中文故需html头}?></body></html>

hello.html

<!DOCTYPE html><html><head lang="en"><meta charset="UTF-8"><title>欢迎</title></head><body><form action="hello.php" method="get">    <input name="name" type="">    <input type="submit" value="提交"></form></body></html>

hello.php

<!DOCTYPE html> <html><head><meta charset="UTF-8"><title>document</title></head><body><?phpif(isset($_GET['name'])&&$_GET['name']){    echo 'hello'.$_GET['name'];}else{    echo '请输入名字';}?></body></html>

文件上传

upload.html

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title></head><body><!--enctype="multipart/form-data"可设置接受二进制文件上传  --><form action="upload.php" method="post" enctype="multipart/form-data"><input type="file" name="file"><input type="submit" value="提交"></form></body></html>

upload.php

<!DOCTYPE html><html><head>    <meta charset="UTF-8">    <title>上传文件</title></head><body><?php$file = $_FILES['file'];$filename = $file['name'];move_uploaded_file($file['tmp_name'], $filename);echo "<img src='$filename'>";?></body></html>

与数据库交互

添加用户

adduser.html

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>添加用户</title></head><body>    <form action="adduser.php" method="post">        <div>用户名字：<input type="text" name="name"></div>         <div>用户年龄：<input type="text" name="age"></div>        <input type="submit" value="提交">    </form></body></html>

adduser.php

<?php$name = $_POST['name'];$age = $_POST['age'];if(!isset($name)){    die('user name not define');}if(!isset($age)){    die('user age not define');}if(empty($name)){    die('user name is empty');}if(empty($age)){    die('user age is empty');}require_once 'functions.php';$conn = connectp1();$age = intval($age);//非字符串必须强制转化，防止错误数据放入数据库mysql_query("INSERT INTO users(name,age) VALUES ('$name',$age)");//字符串必须引起来，防止错误数据放入数据库if(mysql_errno()){//如果出现错误    echo mysql_error();}else{    header("Location:p1.php");//界面跳转到p1.php}

config.php

<?phpdefine('MYSQL_HOST', 'localhost');define('MYSQL_USER', 'root');define('MYSQL_PWD','');?>

functions.php

<?phprequire_once 'config.php';//与config.php文件相关联function connectp1(){    $conn = mysql_connect(MYSQL_HOST,MYSQL_USER,MYSQL_PWD);//连接数据库    if(!$conn){        die('can not connect db');//输出错误信息并运行中断    }    mysql_select_db('myapp');//选择数据表    return $conn;}?>

修改用户

edituser.php

<!DOCTYPE html><html><head>    <meta charset=" UTF-8">    <title>编辑用户</title></head><body><?php// if(isset($_GET['id'])&&!empty($_GET['id'])){//id在集合中或者id为空// }require_once 'functions.php';if(!empty($_GET['id'])){    connectp1();//functions.php中连接到数据库的函数    $id = intval($_GET['id']);    $result = mysql_query("SELECT * FROM users WHERE id = $id");//应用sql语句    if(mysql_errno()){        die('can not connect db');    }    $arr = mysql_fetch_assoc($result);//  print_r($arr);}else{    die('id not define');}?><form action="edituser_server.php" method="post">    <div>用户ID        <input type="text" name="id" value="<?php echo $arr['id'];?>">    </div>    <div>用户名字        <input type="text" name="name" value="<?php echo $arr['name'];?>">    </div>    <div>用户年龄        <input type="text" name="age" value="<?php echo $arr['age'];?>">    </div>    <input type="submit" value="提交修改"></form></body></html>

edituser_server.php

<?phprequire_once 'functions.php';if(empty($_POST['id'])){    die('id is empty');}if(empty($_POST['name'])){    die('name is empty');}if(empty($_POST['age'])){    die('age is empty');}$id = intval($_POST['id']);$name = $_POST['name'];$age = intval($_POST['age']);connectp1();mysql_query("UPDATE users SET name='$name',age=$age WHERE id=$id");//字符串需加单引号if(mysql_errno()){    echo mysql_error();}else{    header("Location:p1.php");//跳转页面}

p1.php

<?php     require_once 'functions.php';?><!DOCTYPE html><html><head>    <meta charset="UTF-8">    <title>用户的添加</title></head><body><a href="adduser.html">添加用户</a><table style='text-align:left' border='1'>        <tr><th>id</th><th>名字</th><th>年龄</th><th>修改</th></tr>    <?php     $conn = connectp1();//引用文件functions.php内的connectp1函数    $result = mysql_query("SELECT * FROM users ORDER BY id DESC",$conn);//从数据库表users中倒序导入所有信息    $datacount = mysql_num_rows($result);//记录表中的数据的条数//  echo $datacount.'<br>';//输出数据条数//  for($i=0;$i<$datacount;$i++){//循环输出每条数据//      $result_arr = mysql_fetch_assoc($result);//      print_r($result_arr);//      echo '<br>';//  }    for($i=0;$i<$datacount;$i++){//循环输出每条数据        $result_arr = mysql_fetch_assoc($result);        $id = $result_arr['id'];//允许字符下标        $name = $result_arr['name'];        $age = $result_arr['age'];        echo "<tr><td>$id</td><td>$name</td><td>$age</td><td><a href='edituser.php?id=$id'>修改</a></td></tr>";    }    ?></table></body></html>

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