安装PECL

//php版本 > 7

$ wget http://pear.php.net/go-pear.phar$ php go-pear.phar

//php版本 < 7
$ yum install php-pear
//否则会报错PHP Parse error: syntax error, unexpected //'new' (T_NEW) in /usr/share/pear/PEAR/Frontend.php on //line 91

安装扩展

$ pecl install mongodb

And if I try to install mongodb for example, I'll get the same warnings as before with an extra "XML Extension not found" at the end.

I compared the "/usr/bin/pecl" with one from ubuntu and the only difference is the "-n" in the exec line :
alpine:
exec $PHP -C -n -q $INCARG -d date.timezone=UTC -d output_buffering=1 -d variables_order=EGPCS -d safe_mode=0 -d register_argc_argv="On" $INCDIR/peclcmd.php "$@"

-n meaning: "No configuration (ini) files will be used"
If not using conf, xml won't be loaded, so I'm pretty sure the "-n" should be removed.

I tested after removing it, and got no warning or anything and was able to install my extension.

以上问题的解决方式：
vi /usr/bin/pecl
remove -n para
删除 -n 参数

安装完毕后，添加库到php.ini

extension=mongodb.so

安装 PHPLIB

http://php.net/manual/zh/mongodb.tutorial.library.php
https://getcomposer.org/download/
安装完毕后，安装 PHP Library for MongoDB (PHPLIB)
$ composer require mongodb/mongodb``<br/>最新版本的命令是：<br/>$ composer.phar require mongodb/mongodb`

一切正确后，在当前目录下，生成：vendor目录，OK

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