CentOs 自带 PHP 之坑

在虚拟机上安装了CentOs6.5在上面安装了lnmp开发集成包（php7.1），对于之前没有任何开发经验的我来说，正常且安详滴在集成环境上开发着优雅的小bug.

然而我今天在Composer拉取代码的时候，出现了问题：

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/php/lib/php/extensions/pdo/pdo_mysql.so' - /usr/local/php/lib/php/extensions/pdo/pdo_mysql.so: undefined symbol: pdo_parse_params in Unknown on line 0
Using version ^3.4 for sonata-project/admin-bundle
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1

The requested package doctrine/orm (installed at v2.4.8, required as ^2.5) is satisfiable by doctrine/orm[v2.4.8] but these conflict with your requirements or minimum-stability.
Problem 2

doctrine/orm v2.5.4 requires ext-pdo * -> the requested PHP extension pdo is missing from your system.

doctrine/orm v2.5.3 requires ext-pdo * -> the requested PHP extension pdo is missing from your system.

doctrine/orm v2.5.2 requires ext-pdo * -> the requested PHP extension pdo is missing from your system.

doctrine/orm v2.5.1 requires ext-pdo * -> the requested PHP extension pdo is missing from your system.

doctrine/orm v2.5.0 requires ext-pdo * -> the requested PHP extension pdo is missing from your system.

Installation request for doctrine/orm ^2.5 -> satisfiable by doctrine/orm[v2.5.0, v2.5.1, v2.5.2, v2.5.3, v2.5.4].

To enable extensions, verify that they are enabled in those .ini files:

/etc/php.ini

/etc/php.d/curl.ini

/etc/php.d/fileinfo.ini

/etc/php.d/json.ini

/etc/php.d/phar.ini

/etc/php.d/zip.ini
You can also run php --ini inside terminal to see which files are used by PHP in CLI mode.　　

这里的问题好像在告诉我，PHP 没有安装 PDO扩展，然而我 通过 phpinfo() 阅览了一下，PDO 是真实存在的，我很是懵逼。

（关于扩展的小提示：通常在windows 上开发，通过 WAMP下直接在php.ini中启用PDO就行（去掉;extension=php_pdo.dll前面的分号“;”），而linux上添加扩展 是以 .so 结尾的扩展名参考如下：https://blog.csdn.net/leedaning/article/details/46314521 通过上面的小提示，我发现我执行不了 phpize ， 然后发现我并没有openssl  我差点去执行了 php 的 openssl 源码安装 相关扩展，我这样的行为是愚蠢的，因为扩展是有的，而我现在发现我竟然也没有openssl 这个C源码扩展。原因是我不是编译安装的而是通过集成安装的环境；若真的这么做了我可能会发现新的问题，也甚者会越走越远....）

于是 通过 php -m 我发现php的扩展并没有 pdo   mysqli ...， 而我执行 /usr/local/php/bin/php -m 发现竟然有PDO   MYSQLI 扩展，我很是懵逼！原来问题是这样的 CentOs 其实安装完成后 会自带了一个php5.3的版本，我一直没有发现。而我通过 Composer install 的时候其实走的是默认PHP版本，那默认PHP版本就是CentOs自带的 5.3的版本，我的天呐！！！

通过如下命令才真正的使用了PHP7.1的版本，果然没有任何问题！

/usr/local/php/bin/php composer install

删掉默认CentOs 自带PHP5.3版本　

通过如下命令：匹配php,移除php

[root@localhost MerchantAdmin]# rpm -qa|grep php
php-mbstring-5.3.3-49.el6.x86_64
php-cli-5.3.3-49.el6.x86_64
php-devel-5.3.3-49.el6.x86_64
php-common-5.3.3-49.el6.x86_64
php-5.3.3-49.el6.x86_64
php-bcmath-5.3.3-49.el6.x86_64
[root@localhost MerchantAdmin]# yum uninstall php-common
Loaded plugins: fastestmirror, refresh-packagekit, security
No such command: uninstall. Please use /usr/bin/yum --help
[root@localhost MerchantAdmin]# yum remove php-common

删除完之后执行了 php -v　　

[root@localhost MerchantAdmin]# php -v
-bash: /usr/bin/php: No such file or director　　

　由此可见 php 并没有全局使用的权限，继续修改添加全局目录

[root@localhost bin]# vim /etc/profile

　添加如下后两句即可　

#set for nodejs
export NODE_HOME=/usr/local/src/node-v8.9.4
export PATH=$NODE_HOME/bin:$PATH
export PHP_HOME=/usr/local/php
export PATH=$PATH:$PHP_HOME/bin

　然后重启 profile

source /etc/profile

[root@localhost bin]# source /etc/profile
[root@localhost bin]#
[root@localhost bin]#
[root@localhost bin]# php -v
PHP 7.1.7 (cli) (built: Jan 23 2018 19:32:07) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies

终于大功告成，坑太深！