指定pcntl和posix

    composer install —ignore-platform-reqs

    下面内容添加到composer.json相应位置

    1. {
    2.   "config": {   
    3.     "platform": {     
    4.       "ext-pcntl": "7.3",     
    5.       "ext-posix": "7.3"   
    6.     }
    7. }

    更换composer国内源

    https://developer.aliyun.com/composer