如以下错误

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
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

原因
这个问题的原因主要是php为了安全问题，禁止putenv（）这个函数。

解决方法
修改php的配置文件，php.ini
找到disable_function这个地方，把putenv去掉即可。
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原文链接：https://blog.csdn.net/qq_38494372/article/details/96602329