先安装composer: brew install composer
通过composer安装laravel: composer global require "laravel/installer"

然后编辑.bashrc: 

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vim ~/.bash_profile
export PATH="~/.composer/vendor/bin:$PATH"           
source ~/.bash_profile

PhpStorm代码提示laravel

composer require barryvdh/laravel-ide-helper
然后到找到 config/app.php 里面的providers最下面写如Barryvdh\LaravelIdeHelper\IdeHelperServiceProvider::class,
最后执行php artisan ide-helper:generate

composer国内加速

在composer.json添加以下代码

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{
     "repositories": [
            {"type": "composer", "url": "http://packagist.phpcomposer.com"},
            {"packagist": false}
        ]
}

global composer 更新

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cd /Users/username/.composer
composer update