php 后端开发学习

 

hello.php:

  1 <?php
  2 //设置cookies
  3 setcookie("user", "runoob", time()+3600);
  4 ?>
  5 <?php
  6 session_start();
  7 // 存储 session 数据
  8 $_SESSION['views']=1;
  9 ?>
 10 
 11 <html>
 12  <head>
 13   <title>PHP 测试</title>
 14  <meta charset="UTF-8">
 15  </head>
 16  <body style="text-align:center">
 17 
 18 <!-- 输出-->
 19 
 20 <?php echo '<p>Hello World</p>' ; ?>
 21 
 22 
 23 <!-- for 循环-->
 24 <?php
 25 $x=array("one","two","three");
 26 foreach ($x as $value)
 27 {
 28 echo $value . "<br>";
 29 }
 30 ?>
 31 
 32 <!--if  判断-->
 33 <?php
 34 if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE) {
 35 ?>
 36 <h3>strpos() 肯定没有返回假 (FALSE)</h3>
 37 <p>正在使用 Internet Explorer</p>
 38 <?php
 39 } else {
 40 ?>
 41 <h3>strpos() 肯定返回假 (FALSE)</h3>
 42 <center><b>没有使用 Internet Explorer</b></center>
 43 <?php
 44 }
 45 ?>
 46 
 47 <!--函数定义-->
 48 <?php
 49 function add($x,$y)
 50 {
 51 $total=$x+$y;
 52 return $total;
 53 }
 54 
 55 echo "1 + 16 = " . add(1,16);
 56 ?>
 57 <br/>
 58 
 59 
 60 
 61 <!-- 面向对象-->
 62  <?php
 63 class Site {
 64   /* 成员变量 */
 65   var $url;
 66   var $title;
 67   
 68   /* 成员函数 */
 69   function setUrl($par){
 70      $this->url = $par;
 71   }
 72   
 73   function getUrl(){
 74      echo $this->url . PHP_EOL;
 75   }
 76   
 77   function setTitle($par){
 78      $this->title = $par;
 79   }
 80   
 81   function getTitle(){
 82      echo $this->title . PHP_EOL;
 83   }
 84 }
 85 
 86 $runoob = new Site;
 87 $taobao = new Site;
 88 $google = new Site;
 89 
 90 // 调用成员函数，设置标题和URL
 91 $runoob->setTitle( "菜鸟教程" );
 92 $taobao->setTitle( "淘宝" );
 93 $google->setTitle( "Google 搜索" );
 94 
 95 $runoob->setUrl( 'www.runoob.com' );
 96 $taobao->setUrl( 'www.taobao.com' );
 97 $google->setUrl( 'www.google.com' );
 98 
 99 // 调用成员函数，获取标题和URL
100 $runoob->getTitle();
101 $taobao->getTitle();
102 $google->getTitle();
103 
104 $runoob->getUrl();
105 $taobao->getUrl();
106 $google->getUrl();
107 ?> 
108 
109 
110 <!--form表单 , post  方法 -->
111 <form action="hello.php" method="post">
112  <p>姓名: <input type="text" name="name" /></p>
113  <p>年龄: <input type="text" name="age" /></p>
114  <p><input type="submit" /></p>
115 </form>
116 
117 你好<?php echo htmlspecialchars($_POST['name']); ?>,
118 你 <?php echo (int)$_POST['age']; ?> 岁了。
119 
120 
121 <!-- form表单,get 方法-->
122 <form action="hello.php" method="get">
123 Name: <input type="text" name="name" /><br/>
124 Age: <input type="text" name="age" /><br/>
125 <input type="submit" />
126 </form>
127 
128 Welcome <?php echo $_GET["name"]; ?>.<br />
129 You are <?php echo $_GET["age"]; ?> years old!
130 
131 <br></br>
132 
133 
134 <!--文件上传-->
135 <form action="upload_file.php" method="post"
136 enctype="multipart/form-data">
137 <label for="file">Filename:</label>
138 <input type="file" name="file" id="file" /> 
139 <br />
140 <input type="submit" name="submit" value="Submit" />
141 </form>
142 
143 <!-- cookie -->
144 <?php
145 if (isset($_COOKIE["user"]))
146     echo "欢迎 " . $_COOKIE["user"] . "!<br>";
147 else
148     echo "普通访客!<br>";
149 ?>
150 
151 
152 <!--session-->
153 <?php echo "浏览量：". $_SESSION['views']; ?>
154 
155 
156 <br/>
157 <!--创建数据库-->
158 <?php
159 $servername = "localhost";
160 $username = "root";
161 $password = "root";
162 
163 // 创建连接
164 $conn = new mysqli($servername, $username, $password);
165 // 检测连接
166 if ($conn->connect_error) {
167     die("连接失败: " . $conn->connect_error);
168 }
169 
170 // 创建数据库
171 $sql = "CREATE DATABASE myDB";
172 if ($conn->query($sql) === TRUE) {
173     echo "数据库创建成功";
174 } else {
175     echo "Error creating database: " . $conn->error;
176 }
177 
178 $conn->close();
179 ?> 
180 <br/>
181 <!--创建数据表-->
182 <?php
183 $servername = "localhost";
184 $username = "root";
185 $password = "root";
186 $dbname = "myDB";
187 
188 // 创建连接
189 $conn = new mysqli($servername, $username, $password, $dbname);
190 // 检测连接
191 if ($conn->connect_error) {
192     die("连接失败: " . $conn->connect_error);
193 }
194 
195 // 使用 sql 创建数据表
196 $sql = "CREATE TABLE MyGuests (
197 id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
198 firstname VARCHAR(30) NOT NULL,
199 lastname VARCHAR(30) NOT NULL,
200 email VARCHAR(50),
201 reg_date TIMESTAMP
202 )";
203 
204 if ($conn->query($sql) === TRUE) {
205     echo "Table MyGuests created successfully";
206 } else {
207     echo "创建数据表错误: " . $conn->error;
208 }
209 
210 $conn->close();
211 ?> 
212 <br/>
213 <!--向数据库中添加新的记录-->
214 <?php
215 $servername = "localhost";
216 $username = "root";
217 $password = "root";
218 $dbname = "myDB";
219 
220 // 创建连接
221 $conn = new mysqli($servername, $username, $password, $dbname);
222 // 检测连接
223 if ($conn->connect_error) {
224     die("连接失败: " . $conn->connect_error);
225 }
226 
227 $sql = "INSERT INTO MyGuests (firstname, lastname, email)
228 VALUES ('John', 'Doe', 'john@example.com')";
229 
230 if ($conn->query($sql) === TRUE) {
231     echo "新记录插入成功";
232 } else {
233     echo "Error: " . $sql . "<br>" . $conn->error;
234 }
235 
236 $conn->close();
237 ?>
238  </body>
239 </html>

uploada_file.php:

 1 <?php
 2 // 允许上传的图片后缀
 3  header("Content-type: text/html; charset=utf-8");
 4 $allowedExts = array("gif", "jpeg", "jpg", "png");
 5 $temp = explode(".", $_FILES["file"]["name"]);
 6 echo $_FILES["file"]["size"];
 7 $extension = end($temp);     // 获取文件后缀名
 8 if ((($_FILES["file"]["type"] == "image/gif")
 9 || ($_FILES["file"]["type"] == "image/jpeg")
10 || ($_FILES["file"]["type"] == "image/jpg")
11 || ($_FILES["file"]["type"] == "image/pjpeg")
12 || ($_FILES["file"]["type"] == "image/x-png")
13 || ($_FILES["file"]["type"] == "image/png"))
14 && ($_FILES["file"]["size"] < 204800)   // 小于 200 kb
15 && in_array($extension, $allowedExts))
16 {
17     if ($_FILES["file"]["error"] > 0)
18     {
19         echo "错误：: " . $_FILES["file"]["error"] . "<br>";
20     }
21     else
22     {
23         echo "上传文件名: " . $_FILES["file"]["name"] . "<br>";
24         echo "文件类型: " . $_FILES["file"]["type"] . "<br>";
25         echo "文件大小: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
26         echo "文件临时存储的位置: " . $_FILES["file"]["tmp_name"] . "<br>";
27         
28         // 判断当期目录下的 upload 目录是否存在该文件
29         // 如果没有 upload 目录，你需要创建它，upload 目录权限为 777
30         if (file_exists("upload/" . $_FILES["file"]["name"]))
31         {
32             echo $_FILES["file"]["name"] . " 文件已经存在。 ";
33         }
34         else
35         {
36             // 如果 upload 目录不存在该文件则将文件上传到 upload 目录下
37             move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]);
38             echo "文件存储在: " . "upload/" . $_FILES["file"]["name"];
39         }
40     }
41 }
42 else
43 {
44     echo "非法的文件格式";
45 }
46 ?>

 访问结果:

posted @ 2016-12-25 13:45  阿夏z  阅读(909)  评论(0)  编辑  收藏  举报