php 7.4安装imap扩展

#安装依赖包(Centos 7环境)
yum install autoconf gcc gcc-c++ krb5-devel openssl-devel

yum install https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/l/libc-client-2007f-16.el7.x86_64.rpm
yum install https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/u/uw-imap-devel-2007f-16.el7.x86_64.rpm
#如果上面的方法下载很慢，可以先把对应的文件下载好，
#然后进入文件所在目录，执行如下命令，离线安装
rpm -ivh *.rpm

ln -s /usr/lib64/libc-client.so /usr/lib/libc-client.so

#进入对应版本的php安装包的ext/imap目录，如下
cd /usr/local/src/php-7.4.8/ext/imap

#在ext/imap目录执行phpize
/usr/local/php/bin/phpize

#执行configure
./configure --with-php-config=/usr/local/php/bin/php-config --with-imap --with-imap-ssl --with-kerberos

#编译安装
make && make install

#编辑php.ini文件，把extension=imap前面的分号去掉，重启PHP服务