問題描述：

安裝完成php-7.1.17後，安裝composer出現以下錯誤

[root@localhost src]# curl -sS https://getcomposer.org/installer | php
Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The openssl extension is missing, which means that secure HTTPS transfers are impossible.
If possible you should enable it or recompile php with --with-openssl

排查過程中發現php 配置文件的問題，沒有加載到php.ini文件

[root@localhost php]# php --ini
Configuration File (php.ini) Path: /usr/local/php-7.1.17/lib
Loaded Configuration File:         (none)
Scan for additional .ini files in: (none)
Additional .ini files parsed:      (none)

創建軟鏈

[root@localhost php]# ln -s /home/sc/php/php7-9026.ini /usr/local/php/lib/php.ini

　找到php.ini文件

[root@localhost lib]# php --ini
Configuration File (php.ini) Path: /usr/local/php-7.1.17/lib
Loaded Configuration File:         /usr/local/php-7.1.17/lib/php.ini
Scan for additional .ini files in: (none)
Additional .ini files parsed:      (none)

再次安裝composer 正常。

curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer

通過phpinfo 查看是已經加載到了openssl，但是沒有找到php.ini 導致通過絕對路徑時沒有加載到模塊。

PHP composer-setup安裝遇到的openssl extension is missing