Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php ^8.1 but your php version (8.0.30) does not satisfy that requirement. Problem 2 - Root composer.json requires simplesamlphp/simplesamlphp ^2.2.0 -> satisfiable by simplesamlphp/simplesamlphp[v2.2.0]. - simplesamlphp/simplesamlphp v2.2.0 requires php ^8.1 -> your php version (8.0.30) does not satisfy that requirement.

Process completed with exit code 2.

lib/BuiltInServer.php:213:23: PossiblyUndefinedArrayOffset: Possibly undefined array key (see https://psalm.dev/167)

lib/BuiltInServer.php:218:25: PossiblyUndefinedArrayOffset: Possibly undefined array key (see https://psalm.dev/167)

lib/SimpleTestLogger.php:53:20: InvalidArrayOffset: Cannot access value on variable $message using offset value of 'level', expecting int (see https://psalm.dev/115)

Process completed with exit code 2.

lib/ArrayLogger.php:27:9: MixedArrayAssignment: Cannot access array value on mixed variable $this->logs[$level] (see https://psalm.dev/117)

lib/BuiltInServer.php:212:9: MixedAssignment: Unable to determine the type that $code is being assigned to (see https://psalm.dev/032)

lib/BuiltInServer.php:213:52: MixedArgument: Argument 2 of explode cannot be mixed, expecting string (see https://psalm.dev/030)

lib/SigningTestCase.php:20:15: PropertyNotSetInConstructor: Property SimpleSAML\TestUtils\SigningTestCase::$config is not defined in constructor of SimpleSAML\TestUtils\SigningTestCase or in any methods called in the constructor (see https://psalm.dev/074)

lib/SimpleTestLogger.php:68:20: MixedArrayAccess: Cannot access array value on mixed variable $message (see https://psalm.dev/051)

lib/StateClearer.php:87:43: MixedAssignment: Unable to determine the type that $var is being assigned to (see https://psalm.dev/032)

lib/StateClearer.php:88:13: MixedMethodCall: Cannot call method on an unknown class (see https://psalm.dev/015)

lib/StateClearer.php:91:42: MixedAssignment: Unable to determine the type that $var is being assigned to (see https://psalm.dev/032)

lib/StateClearer.php:92:20: MixedArgument: Argument 1 of putenv cannot be mixed, expecting string (see https://psalm.dev/030)