Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires symfony/security-core ^7.1 -> satisfiable by symfony/security-core[v7.1.0, v7.1.1, v7.1.2, v7.1.3]. - symfony/security-core[v7.1.0, ..., v7.1.3] require php >=8.2 -> your php version (8.1.29) does not satisfy that requirement.

Process completed with exit code 2.

src/Auth/Source/X509userCert.php:221:64: PossiblyNullArgument: Argument 2 of array_merge cannot be null, possibly null value provided (see https://psalm.dev/078)

src/Controller/ExpiryWarning.php:78:46: ArgumentTypeCoercion: Argument 1 of SimpleSAML\Auth\State::loadState expects string, but parent type scalar provided (see https://psalm.dev/193)

src/Controller/ExpiryWarning.php:80:13: DocblockTypeContradiction: Cannot resolve types for $state - docblock-defined type array<array-key, mixed> does not contain null (see https://psalm.dev/155)

Process completed with exit code 2.

src/Auth/Source/X509userCert.php:211:78: PossiblyNullOperand: Cannot concatenate with a possibly null null|string (see https://psalm.dev/080)

src/Auth/Source/X509userCert.php:230:77: PossiblyNullOperand: Cannot concatenate with a possibly null null|string (see https://psalm.dev/080)

src/Auth/Source/X509userCert.php:246:70: PossiblyNullOperand: Cannot concatenate with a possibly null null|string (see https://psalm.dev/080)

tests/src/Controller/AuthX509Test.php:25:29: PropertyNotSetInConstructor: Property SimpleSAML\Test\Module\authX509\Controller\AuthX509Test::$config is not defined in constructor of SimpleSAML\Test\Module\authX509\Controller\AuthX509Test or in any methods called in the constructor (see https://psalm.dev/074)

tests/src/Controller/AuthX509Test.php:28:23: PropertyNotSetInConstructor: Property SimpleSAML\Test\Module\authX509\Controller\AuthX509Test::$session is not defined in constructor of SimpleSAML\Test\Module\authX509\Controller\AuthX509Test or in any methods called in the constructor (see https://psalm.dev/074)

tests/src/Controller/AuthX509Test.php:25:29: PropertyNotSetInConstructor: Property SimpleSAML\Test\Module\authX509\Controller\AuthX509Test::$config is not defined in constructor of SimpleSAML\Test\Module\authX509\Controller\AuthX509Test or in any methods called in the constructor (see https://psalm.dev/074)