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问题描述：
按照官方的文档更新，报错
报错内容：
[root@VM-0-15-centos ~]# composer update –prefer-dist –no-plugins –no-dev -a –with-all-dependencies
PHP Fatal error: Uncaught Error: Call to undefined function Composer\XdebugHandler\putenv() in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php:93
Stack trace:
#0 phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Status.php(48): Composer\XdebugHandler\Process::setEnv()
#1 phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/XdebugHandler.php(83): Composer\XdebugHandler\Status->construct()
#2 phar:///usr/local/bin/composer/bin/composer(18): Composer\XdebugHandler\XdebugHandler->construct()
#3 /usr/local/bin/composer(24): require(‘…’)
#4 {main}
thrown in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php on line 93
Fatal error: Uncaught Error: Call to undefined function Composer\XdebugHandler\putenv() in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php:93
Stack trace:
#0 phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Status.php(48): Composer\XdebugHandler\Process::setEnv()
#1 phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/XdebugHandler.php(83): Composer\XdebugHandler\Status->construct()
#2 phar:///usr/local/bin/composer/bin/composer(18): Composer\XdebugHandler\XdebugHandler->construct()
#3 /usr/local/bin/composer(24): require(‘…’)
#4 {main}
thrown in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php on line 93
[root@VM-0-15-centos ~]# php flarum migrate
Could not open input file: flarum
[root@VM-0-15-centos ~]# php flarum cache:clear
调试模式报错内容：
已尝试的解决办法：
不知道怎么解决
网址：