编译PHP时需要加入 --enable-maintainer-zts 选项才能安装pthreads
# pecl install pthread
配置文件
cat > /srv/php-5.5.7/etc/conf.d/pthreads.ini <<EOF extension=pthreads.so EOF
$ php -m |grep pthreads pthreads
pthreads 3.0.0 之后不再支持5.6.x，PHP 版本大于等于 7.0.0
# pecl install pthreads pecl/pthreads requires PHP (version >= 7.0.0RC5), installed version is 5.6.16 No valid packages found install failed
解决方法是安装较低版本的pthreads-2.0.10
# pecl install pthreads-2.0.10