php中的错误和异常是两个不同的概念。

判断一个字符串是否包含乱码：

curl ip.me --proxy 127.0.0.1:8888

===================================================================
 [FATAL ERROR]: all coroutines (count: 1) are asleep - deadlock!
===================================================================

 [Coroutine-1]
--------------------------------------------------------------------
#0  Swoole\Coroutine\Http\Client->recv() called at [/opt/webserver/vendor/swlib/saber/src/WebSocket.php:102]
#1  Swlib\Saber\WebSocket->recv() called at [/opt/webserver/script/src/Task/BinanceContract.php:133]
#2  Task\Test->init() called at [/opt/webserver/script/src/Task/BootScript.php:56]

$ curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
$ python get-pip.py 
$ sudo yum install libXrender-0.9.10-1.el7.x86_64 --setopt=protected_multilib=false
$ sudo yum install libXext-1.3.3-3.el7.x86_64 --setopt=protected_multilib=false
$ sudo yum install libSM-1.2.2-2.el7.x86_64 --setopt=protected_multilib=false
$ pip2 install opencv-python==4.1.1.26
$ pip install requests
$ pip install Pillow