mac增加php扩展pcntl.so

wget http://cn.php.net/distributions/php-7.3.29.tar.gz
tar zxvf php-7.3.29.tar.gz
cd php-7.3.29/ext/pcntl
phpize
./configure
make
sudo mount -uw /
sudo cp modules/pcntl.so /usr/lib/php/extensions/no-debug-non-zts-20180731/
sudo vi /etc/php.ini
增加

extension = "pcntl.so"