pecl install swoole安装swoole，下载完成会提示：
enable sockets supports? [no] : yes
enable openssl support? [no] : yes
enable http2 support? [no] : yes
nable mysqlnd support? [no] :会提示报错：
In file included from /private/tmp/pear/temp/swoole/php_swoole_cxx.cc:1:
In file included from /private/tmp/pear/temp/swoole/php_swoole_cxx.h:19:
In file included from /private/tmp/pear/temp/swoole/php_swoole.h:53:
/private/tmp/pear/temp/swoole/include/swoole.h:620:10: fatal error: 'openssl/ssl.h' file not found
#include
^~~~~~~~~~~~~~~
1 error generated.
make: *** [php_swoole_cxx.lo] Error 1
ERROR: `make' failed 我的系统是Mac，安装openssl会提示已安装：
brew install openssl
Updating Homebrew...
Warning: openssl@1.1 1.1.1d is already installed and up-to-date
To reinstall 1.1.1d, run `brew reinstall openssl@1.1`那肯定是openssl位置没找到，重新执行：
pecl install swoole在openssl指定其位置
enable sockets supports? [no] : yes
enable openssl support? [no] : yes --with-openssl-dir=/usr/local/opt/openssl@1.1
enable http2 support? [no] : yes
nable mysqlnd support? [no] :查询一下安装成功
php --ri swoole
swoole
Swoole => enabled
Author => Swoole Team
Version => 4.4.16
Built => Mar 11 2020 18:15:36
coroutine => enabled
kqueue => enabled
rwlock => enabled
sockets => enabled
openssl => OpenSSL 1.1.1d 10 Sep 2019
http2 => enabled
pcre => enabled
zlib => 1.2.11
brotli => E16777223/D16777223
async_redis => enabled
Directive => Local Value => Master Value
swoole.enable_coroutine => On => On
swoole.enable_library => On => On
swoole.enable_preemptive_scheduler => Off => Off
swoole.display_errors => On => On
swoole.use_shortname => On => On
swoole.unixsock_buffer_size => 262144 => 262144 