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linux 全局安装 composer

将目录切换到/usr/local/bin/目录
    cd /usr/local/bin/
在 bin 目录中下载 composer
    curl -ss https://getcomposer.org/installer | php
通过 composer.phar -v 查看 composer
修改为中国镜像
    composer.phar config -g repo.packagist composer https://packagist.phpcomposer.com
最后我把composer.phar复制了一份，重命名为composer
以后可以直接用composer

mvc架构模式
控制器（controller）- 负责转发请求，对请求进行处理
视图（view） – 界面设计人员进行图形界面设计
模型（model） – 程序员编写程序应有的功能（实现算法等等）、数据库专家进行数据管理和数据库设计(可以实现具体的功能)

实现简易模板引擎：

composer.json

    {
      // 自动加载
      // 可以在composer.json的autoload字段找那个添加自己的autoloader
      "autoload": {
        "psr-4": {
          "app\\controllers\\": "controllers/",
          "app\\models\\": "models/",
          "tools\\": "tools/"
        }
      }
    }

models/users.php

    <?php
    // model层数据库操作演示
    namespace app\models;

    class users
    {
        // 数据存入数据库演示
        public function store()
        {
            echo 'store into database';
        }

        // 查询数据库演示
        public function getusername()
        {
            // 查询数据库
            return 'test-data';
        }
    }

controllers/usercontroller.php

    <?php
    namespace app\controllers;

    use tools\tpl;
    use app\models\users;

    class usercontroller extends tpl
    {
        public function create()
        {
            echo 'user create';
        }

        public function getuser()
        {
            // 通过model查询数据
            $usermodel = new users;
            $username = $usermodel->getusername();

            // 将$username显示在对应的一个html文件当中，并且显示出来
            // 表现层 user/user.html
            // 将变量发送给模板（html文件）
            $this->assign('username', $username);
            $this->assign('age', 20);
            // 显示模板
            $this->display('user/user.html');
        }
    }

views/user/user.html

    <!doctype html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <title>title</title>
    </head>
    <body>
        <h2>
            {$username}
        </h2>
        <h3>
            {$age}
        </h3>
    </body>
    </html>

tools/tpl.php

    <?php
    // 分配变量
    // 将变量发送给模板
    namespace tools;

    class tpl
    {
        protected $assign_vars = [];

        public function assign($tpl_var_name, $val)
        {
            $this->assign_vars[$tpl_var_name] = $val;
        }

        public function display($tpl_name)
        {
            // views/user/$tpl_name
            $classname = get_called_class(); // app\controllers\usercontroller
            $dirname = strtolower(substr(substr($classname, 16), 0, -10)); // user
            $dir = dirname(__dir__) . '/views/' . $dirname . '/' . $tpl_name;
            // file_get_contents
            $content = file_get_contents($dir);
            // preg_replace
            foreach ($this->assign_vars as $tpl_var_name => $val) {
                $content = preg_replace('/\{$' . $tpl_var_name . '\}/', '<?php echo $this->assign_vars["' . $tpl_var_name . '"]; ?>', $content);
            }
            // compile
            $compile = dirname(__dir__) . '/runtime/compile/' . md5($tpl_name) . '.php';
            file_put_contents($compile, $content);
            // include
            include $compile;
        }
    }

smarty模板引擎的使用

服务端开发部分演示
smarty引擎的安装
变量的分配和加载显示模板
以插件形式扩展smarty
缓存控制技术

smarty.php

    <?php
    /**
     * created by phpstorm.
     */
    session_start();
    require './libs/smarty.class.php';

    $smarty = new smarty();

    // 简单配置 初始化设置
    $smarty->settemplatedir('./views');
    $smarty->setcompiledir('./runtime/compile');
    $smarty->setconfigdir('./config');
    $smarty->addpluginsdir('./plugins');
    $smarty->setcachedir('./runtime/cache');

    $smarty->caching = 1;//开启缓存
    $smarty->setcachelifetime(60*60*24);
    $smarty->left_delimiter = '{';
    $smarty->right_delimiter = '}';

    // 缓存机制
    if (!$smarty->iscached('extends.html', $_server['request_uri'])) {

        // 数据库查询
        $data = [[]];

        // 使用 
        $smarty->assign([
            'username' => 'test-data',
            'age' => 20
        ]);

        // 数组
        $smarty->assign('arr1', [1, 2, 3]);
        $smarty->assign('arr2', ['id' => 1, 'username' => 'zhangsan', 'age' => 30]);
        $smarty->assign('users', [
            ['id' => 1, 'username' => 'zhangsan', 'age' => 30],
            ['id' => 2, 'username' => 'lisi', 'age' => 40]
        ]);

        $smarty->assign('hobby_ids', [1, 2, 3]);
        $smarty->assign('hobby_output', ['看书', '敲代码', '看视频']);
        $smarty->assign('options', [
            1 => '看书',
            2 => '敲代码',
            3 => '看视频'
        ]);

        // 注册function
        $smarty->registerplugin('function', 'font', function ($attributes) {
           $text = $attributes['text'];
           $color = $attributes['color'] ?? 'black';
           return '<span style="color: ' . $color . '">' . $text . '</span>';
        });

        // 注册变量修饰器
        $smarty->registerplugin('modifier', 'link', function ($text, $href, $iscapitalize = false) {
           $return = '<a href="' . $href . '">' . $text . '</a>';
           if ($iscapitalize) {
               return ucwords($return);
           }
           return $return;
        });
        
        // 注册块状函数
        $smarty->registerplugin('block', 'link', function ($attributes, $text) {
           $href = $attributes['href'];
           if (!is_null($text)) {
               return '<a href="' . $href . '">' . $text . '</a>';
           }
        });

        // 对象
        $smarty->assign('obj', $smarty);

        $smarty->assign('text', 'this is a paragraph!');

        $smarty->display('smarty.html');
        $smarty->display('loop.html');
        $smarty->display('single_tag_func.html');
        $smarty->display('modifier.html');
        $smarty->display('block_func.html');
        $smarty->display('plugins.html');
        $smarty->assign('users', $data);
    }
    $smarty->clearcache('extends.html', $_server['request_uri']);
    $smarty->clearallcache();
    $smarty->display('extends.html', $_server['request_uri']);

前端开发部分演示

注释和变量的使用smarty.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>title</title>
</head>
<body>
    <h2>
        <!-- 模板注释被*星号包围，而两边的星号又被定界符包围 -->
        {*$username*}
        {$username}
    </h2>
    <h3>
        <!-- 变量 -->
        {$age}
    </h3>
    <hr>
        <!-- 索引数组 -->
        arr1:
        {$arr1[1]}
    <hr>
        <!-- 关联数组 -->
        arr2:
        {$arr2['username']}
        {$arr2.username}
    <hr>
        <!-- 对象 -->
        object:
        {var_dump($obj->gettemplatedir())}
    <hr>
        <!-- 变量的运算 -->
        {$var = 100}
        {$var}
        {$foo = $var + 200}
        {$foo}
    <hr>
        {$foo}
    <hr>
        <!-- 保留变量的使用 -->
        $_get:
        {var_dump($smarty.get)}
    <hr>
        $_post:
        {var_dump($smarty.post)}
    <hr>
        $_request:
        {var_dump($smarty.request)}
    <hr>
        cookie:
        {var_dump($smarty.cookies)}
    <hr>
        session:
        {var_dump($smarty.session)}
    <hr>
        server:
        {var_dump($smarty.server)}
    <hr>
        env:
        {var_dump($smarty.env)}
    <hr>
        {time()}
        {$smarty.now}
    <hr>
        <!-- 加载配置文件后，配置文件中的变量需要用两个井号“#”包围或者是 smarty的保留变量$smarty.config.来调用 -->
        {config_load file='base.conf'}
        {#font_size#}
        {$smarty.config.font_color}
</body>
</html>

流程控制的使用loop.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>流程控制</title>
</head>
<body>
   <!--  使用{if}处理分支结构 -->
    {$number = 200}
    {if $number === 100}
        gt
    {else if $number == 200}
        this number is 200
    {else}
        this number is not 100
    {/if}

    {$bool = false}
    {if not $bool}
        not
    {/if}

    {if $number is not even}
        odd
    {/if}

    {if $number is not odd}
        even
    {/if}

    {if $number mod 2 == 0}
        even
    {/if}

    {if $number is not odd by 3}
        odd
    {/if}

    <!-- 使用{for}处理循环 -->
    {for $i = 5 to 4 step 2}
        {$i}
    {forelse}
        no loop
    {/for}

    <!-- 使用{while}处理循环 -->
    {while $number > 195}
        {$number--}
    {/while}

    <!-- 使用{foreach}遍历数组 -->
    {foreach $arr2 as $key => $val}
        {if $val@first}
            {*break*}
            {continue}
        {/if}
        {$key}:{$val}
        {$val@key}
        {$val@index}
        {$val@iteration}
        {$val@first}
        {$val@last}
        {$val@show}
        {$val@total}
    {foreachelse}
        data does not exist
    {/foreach}

    <!-- 使用{section}遍历数组 -->
    {section name=key loop=$arr1}
        {$arr1[key]}
    {/section}

    {section name=key loop=$users2 step=-1 max=2}
        id: {$users[key].id}
        username: {$users[key].username}
        age: {$users[key].age}
        {$smarty.section.key.index}
        {$smarty.section.key.iteration}
        {$smarty.section.key.rownum}
        {$smarty.section.key.index_prev}
        {$smarty.section.key.index_next}
    {sectionelse}
        no loop
    {/section}

</body>
</html>

常用标签函数的使用single_tag_func.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>常用标签函数的使用</title>
</head>
<body>
    {assign var="name" value="jason"}
    {assign "name" "jason lee"}
    {$name}

    {append var="arr1" value=4 index="3"}
    {var_dump($arr1)}

    {ldelim}$name{rdelim}

    {html_checkboxes name="hobby" values=$hobby_ids output=$hobby_output selected=$hobby_ids}
    {html_checkboxes name="hobby" options=$options selected=$hobby_ids}
    {html_image width="50" height="50" alt="google" href="http://www.google.com" file="https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png"}
    {html_options name="hobby" values=$hobby_ids output=$hobby_output selected=2}
    {html_options name="hobby" options=$options selected=2}
    {html_radios name="hobby" options=$options selected=2}
    {html_select_date}
    {html_select_time}
    {html_table loop=$arr1 cols=2 rows=3}
    {mailto address="86267659@qq.com" subject="test" text="给我发邮件" cc="123123@qq.com"}
    {math equation="x + y" x = 100 y = 200}
</body>
</html>

变量修饰器的使用modifier.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>变量修饰器的使用</title>
</head>
<body>
    {$str="123123\nthis is string."}
    <hr>
    {$str|capitalize:true:true}
    <hr>
    {$str|capitalize:true:true|cat:'.'}
    <hr>
    {$str|count_characters}
    <hr>
    {$str|count_paragraphs}
    <hr>
    {$str|count_sentences}
    <hr>
    {$str|count_words}
    <hr>
    {$str2|default:'not data yet'}
    <hr>
    {time()|date_format:'%y-%m-%d %h:%m:%s'}
    <hr>
    {$chinese = '中文'}
    {$chinese|from_charset:'utf-8'|to_charset:'gb2312'}
    <hr>
    {$str|indent:10:'---'}
    <hr>
    {$str|lower|upper}
    <hr>
    {$str2="this is p1.\nthis is p2."}
    {$str2|nl2br}
    <hr>
    {$str|regex_replace:'/\d+/':' '}
    <hr>
    {$str|replace:'123123':'000'}
    <hr>
    {$str|spacify:'-'}
    <hr>
    {$float='10.0020398475'}
    {$float|string_format:'%.2f'}
    <hr>
    {$str3='a     b     c'}
    {$str3|strip:'-'}
    <hr>
    {$tag='<b>font</b>'}
    {$tag|strip_tags}
    <hr>
    {$bigstr='123123123123123123ahjfdashfksdhfkjsdhjkfshfjkhsd'}
    {$bigstr|truncate:10:'---':true:true}
    <hr>
    {$tag|escape|unescape}
    <hr>
    {$bigstr|wordwrap:10:"\n":true}
</body>
</html>

块函数的使用block_func.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>块函数的使用</title>
</head>
<body>
    {textformat indent='4' indent_first='10' indent_char='-' wrap='10' wrap_char='<hr>' wrap_cut=true assign='var'}
    aaaaaaaaaaaaaaa
    aaaaaaaaaaaaaaa
    aaaaaaaaaaaaaaa
    aaaaaaaaaaaaaaa
    aaaaaaaaaaaaaaa
    aaaaaaaaaaaaaaa
    aaaaaaaaaaaaaaa
    {/textformat}

    {*$var*}

    {nocache}
        {time()}
    {/nocache}
    <hr>
    {time()}
</body>
</html>

插件的开发plugins.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>title</title>
</head>
<body>
    {font text=$text color='#123123'}
    {$text|link:'http://www.baidu.com'}
    {link href='http://www.baidu.com'}
        aaaaaaaaaaaaaaaaa
        aaaaaaaaaaaaaaaaa
        aaaaaaaaaaaaaaaaa
        aaaaaaaaaaaaaaaaa
        aaaaaaaaaaaaaaaaa
        aaaaaaaaaaaaaaaaa
        aaaaaaaaaaaaaaaaa
    {/link}
</body>
</html>

smarty模板引擎插件的开发：
1、使用registerplugin( )方法扩充插件格式

2、在smarty模板的libs/plugins/目录下创建函数插件文件

block.link.php

function smarty_block_link($attributes, $text)
{
    $href = $attributes['href'];
    if (!is_null($text)) {
        return '<a href="' . $href . '">' . $text . '</a>';
    }
}

function.font.php

function smarty_function_font($attributes)
{
    $text = $attributes['text'];
    $color = $attributes['color'] ?? 'black';
    return '<span style="color: ' . $color . '">' . $text . '</span>';
}

modifier.link.php

function smarty_modifier_link($text, $href, $iscapitalize = false)
{
    $return = '<a href="' . $href . '">' . $text . '</a>';
    if ($iscapitalize) {
        return ucwords($return);
    }
    return $return;
}

模板继承的使用
extends.html

!-- 使用{extends}函数实现模板继承
合并子模板和父模板的{block}标签内容 -->

{extends file="layout.html"}
{block name="title"}
    article {$smarty.block.parent}
{/block}

{block name="content"}
    article list
    {$smarty.get.page}
    {*nocache*}
        {time()}
    {*/nocache*}
    {time()|date_format:'%h:%m:%s' nocache}
{/block}

layout.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>{block name="title"} - imooc{/block}</title>
</head>
<body>
    <header>
        menu
    </header>
    {block name="content"}{/block}
    <footer>
        copyright
    </footer>
</body>
</html>

缓存机制
开启缓存
　　$smarty -> caching = 1|2|0;
　　$smarty -> setcachedir(“./cache”);
　　$smarty->setcachelifetime(300); // 5分钟，以秒为单位，-1永不过期
　　$smarty -> display(‘index.tpl’);
　　$smarty -> display(‘index.tpl’, $_server[‘request_uri’]);

相关函数
　　iscached()
　　clearcache()
　　clearallcache()

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