Composer

Composer

Composer是PHP中用来管理程序包的工具。（后端库管理工具）

官方网站 https://getcomposer.org/

浏览全部程序包 https://packagist.org/

比如 https://packagist.org/packages/yiisoft/yii2-app-advanced

composer create-project --prefer-dist yiisoft/yii2-app-advanced advanced

对照composer.json

"require": {
    "php": ">=5.4.0",
    "yiisoft/yii2": ">=2.0.6",
    "yiisoft/yii2-bootstrap": "*",
    "yiisoft/yii2-swiftmailer": "*"
},
"require-dev": {
    "yiisoft/yii2-codeception": "*",
    "yiisoft/yii2-debug": "*",
    "yiisoft/yii2-gii": "*",
    "yiisoft/yii2-faker": "*"
}

安装示例

一个有关DateTime的库 https://packagist.org/packages/nesbot/carbon

composer require nesbot/carbon

# 卸载
composer remove nesbot/carbon

安装后注意vendor目录和composer.json文件的变化

frontendcontrollersSiteController.php

use CarbonCarbon;

public function actionAbout()
{
    $myTime = Carbon::now()->addDay(-2)->toDateTimeString();
    return $this->render("about", ["model" => $model, "myTime" => $myTime]);
}

frontendviewssiteabout.php

/* @var $myTime string */

<p>我的时间：<?= $myTime ?></p>

框架和库

什么是框架（Framework）？
什么是库（Library）？