小编Cod*_*ker的帖子

我正在使用 ubuntu 21.04，因为我使用此命令安装了 Composer sudo apt-get install composer，安装后我输入composer它显示以下错误

HP Fatal error:  Uncaught Error: Call to undefined function Symfony\Component\Console\Helper\mb_detect_encoding() in /usr/share/php/Symfony/Component/Console/Helper/Helper.php:50
Stack trace:
#0 /usr/share/php/Symfony/Component/Console/Descriptor/TextDescriptor.php(329): Symfony\Component\Console\Helper\Helper::strlen('h')
#1 /usr/share/php/Symfony/Component/Console/Descriptor/TextDescriptor.php(97): Symfony\Component\Console\Descriptor\TextDescriptor->calculateTotalWidthForOptions(Array)
#2 /usr/share/php/Symfony/Component/Console/Descriptor/TextDescriptor.php(197): Symfony\Component\Console\Descriptor\TextDescriptor->describeInputDefinition(Object(Symfony\Component\Console\Input\InputDefinition), Array)
#3 /usr/share/php/Symfony/Component/Console/Descriptor/Descriptor.php(55): Symfony\Component\Console\Descriptor\TextDescriptor->describeApplication(Object(Composer\Console\Application), Array)
#4 /usr/share/php/Symfony/Component/Console/Helper/DescriptorHelper.php(67): Symfony\Component\Console\Descriptor\Descriptor->describ in /usr/share/php/Symfony/Component/Console/Helper/Helper.php on line 50

请帮我解决这个问题

我对如何检查$userLaravel 中的 User 对象没有什么困惑。

$user = Apiato::call('User@FindUsersbytask', [$request->id]);
if($user) {   // here i have to check weather the $user is a user object or not
    Apiato::call('User@deleteuserTask', [$request->id]);
    ...