这篇博客讨论了PHP警告信息'putenv() has been disabled for security reasons'的原因，该问题源于PHP为了增强安全性而禁用了putenv函数。解决方法是修改php.ini配置文件，取消对putenv函数的禁用。通过移除disable_functions配置中的putenv，可以重新启用该函数，从而消除警告。
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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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