yum安装php的,默认是不安装pcntl的,因此需要单独编译安装,首先下载对应版本的php,解压后
cd php-version/ext/pcntl
phpize
./configure && make && make install
cp /usr/lib/php/modules/pcntl.so /usr/lib64/php/modules/pcntl.so
echo "extension=pcntl.so" >> /etc/php.ini
/etc/init.d/httpd restart