在宝塔安装composer，出现 putenv() has been disabled for security reasons
PHP Warning: putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php on line 149
Warning: putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php on line 149
PHP Warning: putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/bin/composer on line 57
Warning: putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/bin/composer on line 57
方法一：
打开配置文件php.ini，找到disable_functions字符串，把后面的putenv删除即可正常安装。
方法二：
宝塔面板的话，我的版本是7.2，就找到 PHP7.2管理→禁用函数→删除putenv，重载配置文件后即可正常安装
方法三：多版本PHP共存的处理
按上面操作后错误还在，你就要查看服务器上是不是还安装了其他PHP版本，
宝塔面板是支持多版本PHP共存的，所以你需要把别的版本PHP的 “putenv” 也删掉。
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