1>Internet Development
Internet: Traditional Internet, Mobile Internet
Internet development: front-end development (front-end), back-end development (back-end, server)
Front-end development: visual display (user interface), user interaction, collecting input information
Backend development: manage and process data, develop interfaces to clients, control output
2> Client server mode (C/S)
Client: actively initiate communication (initiate request), such as browsers, mobile clients, etc.
Server: passively waiting for communication (responding to requests), such as: web server, FTP server, mail server, etc.
3> Web Server Development
Web Server: In a network environment, it provides response services to clients that initiate requests, mainly processing HTTP requests.
1> Environment setup
Apache: Web server software, supports most computer operating systems, and is one of the most popular Web server software. Mac system comes with Apache.
PHP: A scripting language suitable for Webserver development, cross-platform, supporting most databases and operating systems, mixed with C and Java language syntax, open source code.
MySQL: Relational database management system, small in size and fast, widely used in small and medium-sized websites.
2> XAMPP and Coda
Coda: a web programming tool for Mac computers with multi-language support (HTML, PHP, JavaScript, CSS, etc.)
3> Web Server Workflow
1> Principle
2> Local server path
3> Access server files
URL format: protocol://domain name/path/query
http://127.0.0.1
Access the root directory of the local web server and load the index file content by default
http://127.0.0.1/File path (including file name and suffix)
Access a file in the root directory of the local web server, such as pictures, php, html
1> PHP tag
<?<span>php </span><span>echo</span>("hello lanou");<span>//</span><span> 输出函数</span> "<br/>" <span>//</span><span> 换行</span> <span>echo</span> "iOS"; <span>//</span><span> 输出函数,可以不带括号 </span> ?>
Reference learning website: http://www.runoob.com/php/php-tutorial.html
2> Variables
Variable definition
Variables start with $, followed by the variable name
Variables are composed of letters, numbers, and underscores, and do not start with numbers
Variable names are case-sensitive
Define automatic type variables
<span> $int_value</span> = 10<span>; </span><span>$float_value</span> = 1.5<span>; </span><span>$name</span> = "hello lanou";
Get the variable type and return string
<span> gettype</span>(<span>$name</span>);
3> String
Connection string
<span>$name</span> = 'iPhone'<span>; </span><span>$str</span> = '5'<span>; </span><span>$name</span> = <span>$name</span>.<span>$str</span><span>; </span><span>echo</span>(<span>$name</span>);
4> if branch
<span>//</span><span>比较两个变量,输出最大值</span> <span>$a</span> = 3;<span>$b</span> = 5<span>; </span><span>if</span>(<span>$a</span>><span>$b</span><span>){ </span><span>echo</span>(<span>$a</span><span>); }</span><span>else</span><span>{ </span><span>echo</span>(<span>$b</span><span>); }</span>
5> for loop
<span>//</span><span>输出1~10之间所有的数</span> <span>for</span>(<span>$i</span> = 1;<span>$i</span><=10;<span>$i</span>++<span>){ </span><span>echo</span>(<span>$i</span>.'<br>'<span>); }</span>
6> Random number
Generate a random number between a~b rand(a, b)
<span>//</span><span> 生成20~50之间的随机数,并输出</span> <span>$num</span> = <span>rand</span>(20, 50<span>); </span><span>echo</span> <span>$num</span>;
7> Array
In PHP, use the array() function to create an array
In PHP, there are three types of arrays:
Numeric array - array with numeric ID keys (similar to NSArray)
Associative array - an array with specified keys, each key is associated with a value (similar to NSDictionary)
Multidimensional array - an array containing one or more arrays
<span>$array1</span> = <span>array</span>(); <span>//</span><span> 空数组</span> <span>$array2</span> = <span>array</span>(99, 98, 97); <span>//</span><span> 数值数组 </span> <span>$array3</span> = <span>array</span>("name"=>"lishuai", "age"<span>=>40); // 关联数组,键=>值 print_r(</span><span>$array3</span>); // 输出数组内容
8> Numeric array
The count() function is used to return the number of array elements
<span>$count</span> = <span>count</span>(<span>$array</span><span>); </span><span>echo</span> <span>$count</span>;
Add array elements
<span>$array</span>[] = 96; <span>//</span><span> 数组中最后一个元素</span>
Access array elements
$array[numeric ID key]
Traverse the numerical array
foreach(array as $value){
echo($value."076402276aae5dbec7f672f8f4e5cc81");
}
<span>$array</span> = <span>array</span>(12, 13, 14, 15<span>); </span><span>foreach</span>(<span>$array</span> <span>as</span> <span>$value</span><span>){ </span><span>echo</span>(<span>$value</span>."<br/>"<span>); }</span>
9> Associative array
<span>$person</span> = <span>array</span>("name"=>"yihuiyun", “age"=>"18"<span>) print_r(</span><span>$person</span>); // 输出
Output result Array ( [name] => yihuiyun [age] => 18 )
<span>$person</span> = <span>array</span>("name"=>"yihuiyun", “age"=>"18"<span>) // count()函数用于返回数组元素的数量 </span><span>$count</span> = count(<span>$person</span><span>); echo </span><span>$count</span><span>; //添加键值对 </span><span>$person</span>["sex"] = "female"<span>; //根据键获取值 //</span><span>$person</span>[键]
Traverse associative array
foreach(数组 as $key=>$value){
echo($key.":".$value."076402276aae5dbec7f672f8f4e5cc81");
}
<span>$person</span> = <span>array</span>("name"=>"yihuiyun", “age”=>”18"<span>); foreach(</span><span>$person</span> as <span>$key</span>=><span>$value</span><span>){ echo(</span><span>$key</span>.":".<span>$value</span>."<br/>"<span>); }</span>
10> json转换
<span>//</span><span> 数组转json字符串</span> <span>$json</span> = json_encode(<span>$array</span><span>); </span><span>//</span><span> json字符串转PHP对象</span> <span>$array</span> = json_decode(<span>$json</span>);
1> 概述
在 PHP 中,预定义的 $_GET 变量用于收集来自 method="get" 的表单中的值。
从带有 GET 方法的表单发送的信息,对任何人都是可见的(会显示在浏览器的地址栏),并且对发送信息的量也有限制。
GET 传值的一个 URL:http://127.0.0.1/get.php?username=lanou&password=123
解析:http://127.0.0.1/get.php?参数名1=值1&参数名2=值2
参数名通常由后台规定,前端根据接口文档填写
PHP文件接收数据代码:
<span>//</span><span> 获取数据 key必须与参数名保持一致</span> <span>$name</span> = <span>$_GET</span>["username"<span>]; </span><span>$password</span> = <span>$_GET</span>["password"];
2> iOS网络编程
代码:
1> 概述
预定义的 $_POST 变量用于收集来自 method="post" 的表单中的值。
从带有 POST 方法的表单发送的信息,对任何人都是不可见的(不会显示在浏览器的地址栏),并且对发送信息的量也没有限制
http://127.0.0.1/post.php
URL中不需要携带参数,通过body上传参数
PHP文件接收数据代码:
<span>//</span><span> 获取数据 key必须与参数名保持一致</span> <span>$name</span> = <span>$_POST</span>["username"<span>]; </span><span>$password</span> = <span>$_POST</span>["password"];