composer安装yii2出现的错误信息

1、错误信息

[InvalidArgumentException]                                                                                          
  Package fxp/composer-asset-plugin at version ~1.1.1 has a PHP requirement incompatible with your PHP version, PHP   
  extensions and Composer version 

解决方案：暂无

 
2、错误信息

[Composer\Downloader\TransportException]                                                                            
  curl error 28 while downloading https://repo.packagist.org/packages.json: Operation timed out after 12861 millisec  
  onds with 0 out of 0 bytes received 

解决方案：切换镜像

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

 
3、错误信息

[Composer\Downloader\TransportException]                                                                            
  curl error 61 while downloading https://mirrors.aliyun.com/composer/p2/fxp/composer-asset-plugin.json: Error while  
   processing content unencoding: Unknown failure within decompression software.      

解决方案：清理缓存

 composer clear  

 
4、错误信息

     [Seld\JsonLint\ParsingException]                                        
  "./composer.json" does not contain valid JSON                           
  Parse error on line 1:                                                  
                                                                          
  ^                                                                       
  Expected one of: 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '['     

解决方案：清理缓存

 composer clear  

5、composer检测警告问题----http connectivity to packagist: FAIL

[root@localhost /]# composer diagnose
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity to packagist: FAIL
[Composer\Downloader\TransportException] curl error 7 while downloading http://repo.packagist.org/packages.json: Failed to connect to 2402:1f00:8001:930::: Network is unreachable
Checking https connectivity to packagist: OK
Checking github.com oauth access: OK
Checking disk free space: OK

#检测
[root@localhost /]# php -r 'echo file_get_contents("https://packagist.org/packages.json");'
PHP Warning:  file_get_contents(): SSL: Handshake timed out in Command line code on line 1
PHP Warning:  file_get_contents(): Failed to enable crypto in Command line code on line 1
PHP Warning:  file_get_contents(https://packagist.org/packages.json): failed to open stream: operation failed in Comman

解决方案：修改系统环境变量

vim /etc/profile
#进到profile文件最后一条 修改成：export PATH="$PATH:/usr/local/bin" 后保存退出
source /etc/profile

修改php.ini，把allow_url_fopen给启用，改成 allow_url_fopen = On -----我这修改不管用
修改php.ini，把 “;user_agent=PHP”前的分号去掉----我这修改不管用

6、composer检测警告问题----https connectivity to packagist: FAIL

[root@localhost ~]# composer self-update
You are already using the latest available Composer version 2.0.12 (stable channel).
[root@localhost ~]# composer diagnose
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity to packagist: OK
Checking https connectivity to packagist: FAIL
[Composer\Downloader\TransportException] curl error 28 while downloading https://repo.packagist.org/packages.json: Operation timed out after 10004 milliseconds with 0 out of 0 bytes received
Checking github.com oauth access: OK
Checking disk free space: OK

解决方案：最后什么也没改自己好了

——————————————————————————
修改系统环境变量

root@DS218plus:~# export PATH=$PATH:/usr/local/webserver/php/bin 
root@DS218plus:~# export PATH=$PATH:/usr/local/webserver/mysql/bin