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问题描述：
在此填写
安装插件flarum-ext-online出错
报错内容：
Fatal error: Uncaught TypeError: Return value of Symfony\Component\Process\Process::close() must be of the type int, null returned in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/process/Process.php:1466
Stack trace:
#0 phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/process/Process.php(1355): Symfony\Component\Process\Process->close()
#1 phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/process/Process.php(367): Symfony\Component\Process\Process->updateStatus(false)
#2 phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/process/Process.php(252): Symfony\Component\Process\Process->start(Object(Closure), Array)
#3 phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Util/ProcessExecutor.php(134): Symfony\Component\Process\Process->run(Object(Closure))
#4 phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Util/ProcessExecutor.php(76): Composer\Util\ProcessExecutor->doExecute(Array, ‘C:\wwwroot\www….’, false, NU in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/process/Process.php on line 1466
调试模式报错内容：
已尝试的解决办法：重新安装php
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