運行composer install報錯如下 Loading composer repositories with package information Installing dependencies (including require-dev) from lock file Your requirements could not be resolved to an installable set of packages. Problem 1 - This package requires php ^7.1.3 but your PHP version (7.0.1) does not satisfy that requirement. Problem 2 - Installation request for chillerlan/php-qrcode 2.0.6 -> satisfiable by chillerlan/php-qrcode[2.0.6]. - chillerlan/php-qrcode 2.0.6 requires php >=7.0.3 -> your PHP version (7.0.1) does not satisfy that requirement. Problem 3 - Installation request for chillerlan/php-traits 1.1.13 -> satisfiable by chillerlan/php-traits[1.1.13]. - chillerlan/php-traits 1.1.13 requires php >=7.0.3 -> your PHP version (7.0.1) does not satisfy that requirement. Problem 4 - Installation request for laravel/framework v5.7.5 -> satisfiable by laravel/framework[v5.7.5]. - laravel/framework v5.7.5 requires php ^7.1.3 -> your PHP version (7.0.1) does not satisfy that requirement. Problem 5 - Installation request for laravel/horizon v1.4.0 -> satisfiable by laravel/horizon[v1.4.0]. - laravel/horizon v1.4.0 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system. Problem 6 - Installation request for symfony/cache v4.1.4 -> satisfiable by symfony/cache[v4.1.4]. - symfony/cache v4.1.4 requires php ^7.1.3 -> your PHP version (7.0.1) does not satisfy that requirement. Problem 7 - doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.1) does not satisfy that requirement. - doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.1) does not satisfy that requirement. - Installation request for doctrine/inflector v1.3.0 -> satisfiable by doctrine/inflector[v1.3.0]. To enable extensions, verify that they are enabled in your .ini files: - D:\PHPWAMP_IN2\phpwamp\server\php-7.0.1\php.ini You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode. 運行php artisan make:controller TestController報錯如下 PHP Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in D :\code\tiyu\vendor\symfony\console\Output\Output.php on line 40 Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in D:\cod e\tiyu\vendor\symfony\console\Output\Output.php on line 40 然后嘗試刪除那個問號，報錯如下 PHP Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Console\Output\is_iterable() in D:\code\tiyu\vendor\symfony\console\Output\Output.php:140 Stack trace: #0 D:\code\tiyu\vendor\symfony\console\Output\Output.php(132): Symfony\Component\Console\Output\Output->write('', true, 16) #1 D:\code\tiyu\vendor\symfony\console\Application.php(741): Symfony\Component\Console\Output\Output->writeln('', 16) #2 D:\code\tiyu\vendor\laravel\framework\src\Illuminate\Foundation\Exceptions\Handler.php(469): Symfony\Component\Console\Application->renderException(Object(Symfony\Component\Debug\Exception\Fatal ThrowableError), Object(Symfony\Component\Console\Output\ConsoleOutput)) #3 D:\code\tiyu\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\HandleExceptions.php(101): Illuminate\Foundation\Exceptions\Handler->renderForConsole(Object(Symfony\Component\Console\O utput\ConsoleOutput), Object(Symfony\Component\Debug\Exception\FatalThrowableError)) #4 D:\code\tiyu\vendor\laravel\framework\src\Illuminate\Foundation in D:\code\tiyu\vendor\symfony\console\Output\Output.php on line 140 PHP Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Console\Output\is_iterable() in D:\code\tiyu\vendor\symfony\console\Output\Output.php:140 Stack trace: #0 D:\code\tiyu\vendor\symfony\console\Output\Output.php(132): Symfony\Component\Console\Output\Output->write('', true, 16) #1 D:\code\tiyu\vendor\symfony\console\Application.php(741): Symfony\Component\Console\Output\Output->writeln('', 16) #2 D:\code\tiyu\vendor\laravel\framework\src\Illuminate\Foundation\Exceptions\Handler.php(469): Symfony\Component\Console\Application->renderException(Object(Symfony\Component\Debug\Exception\Fatal ErrorException), Object(Symfony\Component\Console\Output\ConsoleOutput)) #3 D:\code\tiyu\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\HandleExceptions.php(101): Illuminate\Foundation\Exceptions\Handler->renderForConsole(Object(Symfony\Component\Console\O utput\ConsoleOutput), Object(Symfony\Component\Debug\Exception\FatalErrorException)) #4 D:\code\tiyu\vendor\laravel\framework\src\Illuminate\Foundation in D:\code\tiyu\vendor\symfony\console\Output\Output.php on line 140