I tried using PHPUnit 9 but it does not support the latest version of PHP above 8.0 I get the following error
Fatal error: Uncaught error: Call to undefined function each() in C:\xampp\php\pear\PHPUnit\Util\Getopt.php:80 Stack trace: #0 C:\xampp\php\pear \PHPUnit \TextUI\Command.php(242): PHPUnit_Util_Getopt::getopt(Array, 'd:c:hv', Array) #1 C:\xampp\php\pear\PHPUnit\TextUI\Command.php(138) : PHPUnit_TextUI_Command ->handleArguments(Array) #2 C:\xampp\php\pear\PHPUnit\TextUI\Command.php(129): PHPUnit_TextUI_Command->run(Array, true) #3 C:\xampp\php\ phpunit(46): PHPUnit_TextUI_Command ::main() #4 {main} throws
in C:\xampp\php\pear\PHPUnit\Util\Getopt.php on line 80
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Make sure you are not using an older version of PHPUnit to install the global package.
Check this answer to find globally installed packages.
cd $(composer -n config --global home) && ls -la vendor
Maybe you are calling global instead of project.
If you can remove it using
composer global remove phpunit
I guess your environment PATH variable contains the global Composer folder, so phpunit will call that by default.
Otherwise, use ./vendor/bin/phpunit (from directory C:\xampp\htdocs\test) to call the specific version you installed in your project.
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