Windows11+PHP8.2环境下Laravel安装器报错求助

这个问题有不少开发者碰到过，核心原因是PHP的mbstring扩展未启用——mb_rtrim()是mbstring扩展提供的多字节字符串处理函数，Laravel安装器依赖它完成文本处理逻辑。

具体解决步骤： #

• 找到PHP安装目录下的php.ini配置文件（Windows系统中，独立PHP环境通常在C:\php\php.ini；如果是XAMPP/WAMP集成环境，路径对应集成包的PHP子目录）
• 打开php.ini，搜索找到;extension=mbstring这一行，去掉行首的分号;后保存文件
• 关闭当前所有终端窗口，重新打开后执行php -m命令，检查输出列表中是否包含mbstring，确认扩展已启用
• 重新运行Laravel项目创建命令即可

如果启用扩展后仍报错，可尝试更新Laravel安装器到最新版本：

composer global update laravel/installer

报错信息原文： #

PHP Fatal error:  Uncaught Error: Call to undefined function Laravel\Installer\Console\mb_rtrim() in C:\Users\newuser\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php:162
Stack trace:
#0 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Command\Command.php(279): Laravel\Installer\Console\NewCommand->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#1 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Application.php(1029): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Application.php(316): Symfony\Component\Console\Application->doRunCommand(Object(Laravel\Installer\Console\NewCommand), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Application.php(167): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#4 C:\Users\newuser\AppData\Roaming\Composer\vendor\laravel\installer\bin\laravel(13): Symfony\Component\Console\Application->run()
#5 C:\Users\newuser\AppData\Roaming\Composer\vendor\bin\laravel(119): include('C:\\Users\\newuse...')
#6 {main}
  thrown in C:\Users\newuser\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php on line 162

Fatal error: Uncaught Error: Call to undefined function Laravel\Installer\Console\mb_rtrim() in C:\Users\newuser\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php:162
Stack trace:
#0 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Command\Command.php(279): Laravel\Installer\Console\NewCommand->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#1 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Application.php(1029): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Application.php(316): Symfony\Component\Console\Application->doRunCommand(Object(Laravel\Installer\Console\NewCommand), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 C:\Users\newuser\AppData\Roaming\Composer\vendor\symfony\console\Application.php(167): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#4 C:\Users\newuser\AppData\Roaming\Composer\vendor\laravel\installer\bin\laravel(13): Symfony\Component\Console\Application->run()
#5 C:\Users\newuser\AppData\Roaming\Composer\vendor\bin\laravel(119): include('C:\\Users\\newuse...')
#6 {main}
  thrown in C:\Users\newuser\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php on line 162

内容的提问来源于stack exchange，提问作者Sharjeel