ubuntu 16.04 下安装composer

（本文灵感来自https://blog.csdn.net/hxh5801050/article/details/78241215， Code_星华）

其实我主要是想搞那个phpsipder，没想到却搞了一通这。。。（这个跟 Code_星华 的原因是一样的，结果也一样。。。无语）

正题：直接上码

下载：

curl -O https://getcomposer.org/composer.phar

我在这里前，到home文件夹新建了文件夹a，composr.phar就在a里面了。

燃后，重命名：

mv composer.phar composer

之后搬家：

mv composer /usr/local/bin/

到此为止，我不知道别人怎么搞，反正我是无法看到任何composer的信息，不论怎样调试，始终显示

“The program 'composer' is currently not installed. You can install it by typing:
apt install composer”

搬家后，显示为：

“bash: /usr/local/bin/composer: Permission denied”

只有下一步，才能实现那些个参数等，

最后，授权：

chmod +x /usr/local/bin/composer

这个完了以后，composer，就可以看到

Do not run Composer as root/super user! See https://getcomposer.org/root for details
   ______
  / ____/___  ____ ___  ____  ____  ________  _____
 / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                    /_/
Composer version 1.8-dev (af677553cce0967bf7c364d64a9a169152c33fcd) 2018-09-13 07:28:04

Usage:
  command [options] [arguments]

Options:
  -h, --help                     Display this help message
  -q, --quiet                    Do not output any message
  -V, --version                  Display this application version
      --ansi                     Force ANSI output
      --no-ansi                  Disable ANSI output
  -n, --no-interaction           Do not ask any interactive question
      --profile                  Display timing and memory usage information
      --no-plugins               Whether to disable plugins.
  -d, --working-dir=WORKING-DIR  If specified, use the given directory as working directory.
  -v|vv|vvv, --verbose           Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Available commands:
  about                Shows the short information about Composer.
  archive              Creates an archive of this composer package.
  browse               Opens the package's repository URL or homepage in your browser.
  check-platform-reqs  Check that platform requirements are satisfied.
  clear-cache          Clears composer's internal package cache.
  clearcache           Clears composer's internal package cache.
  config               Sets config options.
  create-project       Creates new project from a package into given directory.
  depends              Shows which packages cause the given package to be installed.
  diagnose             Diagnoses the system to identify common errors.
  dump-autoload        Dumps the autoloader.
  dumpautoload         Dumps the autoloader.
  exec                 Executes a vendored binary/script.
  global               Allows running commands in the global composer dir ($COMPOSER_HOME).
  help                 Displays help for a command
  home                 Opens the package's repository URL or homepage in your browser.
  i                    Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json.
  info                 Shows information about packages.
  init                 Creates a basic composer.json file in current directory.
  install              Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json.
  licenses             Shows information about licenses of dependencies.
  list                 Lists commands
  outdated             Shows a list of installed packages that have updates available, including their latest version.
  prohibits            Shows which packages prevent the given package from being installed.
  remove               Removes a package from the require or require-dev.
  require              Adds required packages to your composer.json and installs them.
  run-script           Runs the scripts defined in composer.json.
  search               Searches for packages.
  self-update          Updates composer.phar to the latest version.
  selfupdate           Updates composer.phar to the latest version.
  show                 Shows information about packages.
  status               Shows a list of locally modified packages, for packages installed from source.
  suggests             Shows package suggestions.
  u                    Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file.
  update               Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file.
  upgrade              Upgrades your dependencies to the latest version according to composer.json, and updates the composer.lock file.
  validate             Validates a composer.json and composer.lock.
  why                  Shows which packages cause the given package to be installed.
  why-not              Shows which packages prevent the given package from being installed.

希望帮到你。

下面是记录ThinkCMF的用法：

系统端：

cd到cmf根目录，在运行一遍composer

composer require jaeger/querylist

会有一大段黄色的Warning，不管他，主要说的是已经帮你映射到了think框架里了，

然后cd到app文件夹（非5.0以上版本，可能叫application文件夹）新建一个api文件夹（如果已经下载了api插件的清忽略），

写入代码：

vi PhpsipderController.php

<?php
// +---------------------
// | api just for try by kniferpg
// +---------------------

namespace app\api\controller;

use QL\QueryList;
use cmf\controller\HomeBaseController;

class PhpsipderController extends HomeBaseController
{
        public function index()
        {
                //采集某页面所有的图片
               $data = QueryList::get('http://cms.querylist.cc/bizhi/453.html')->find('img')->attrs('src');
               //打印结果
               print_r($data->all());
        }
}

然后保存，在访问http://域名/api/phpsipder

输出是Array（***）

测试OK。