$ ag '\?[a-z]+ \$[a-z0-9_]+ ?= ?null'
calendar/lib.php
3334:        ?int $lookahead = null) {

admin/tool/analytics/classes/output/helper.php
120:            ?int $selected = null, ?bool $includeall = false, ?bool $shortentext = true): \stdClass {

admin/tool/analytics/classes/output/effectiveness_report.php
55:    public function __construct(\core_analytics\model $model, ?int $contextid = null) {

lib/mlbackend/php/phpml/src/Phpml/Classification/KNearestNeighbors.php
30:    public function __construct(int $k = 3, ?Distance $distanceMetric = null)

lib/mlbackend/php/phpml/src/Phpml/Classification/DecisionTree/DecisionTreeLeaf.php
122:    public function getHTML(?array $columnNames = null): string

lib/mlbackend/php/phpml/src/Phpml/Classification/SVC.php
17:        ?float $gamma = null,

lib/mlbackend/php/phpml/src/Phpml/CrossValidation/Split.php
32:    public function __construct(Dataset $dataset, float $testSize = 0.3, ?int $seed = null)
65:    protected function seedGenerator(?int $seed = null): void

lib/mlbackend/php/phpml/src/Phpml/Clustering/DBSCAN.php
29:    public function __construct(float $epsilon = 0.5, int $minSamples = 3, ?Distance $distanceMetric = null)

lib/mlbackend/php/phpml/src/Phpml/Transformer.php
12:    public function fit(array $samples, ?array $targets = null): void;

lib/mlbackend/php/phpml/src/Phpml/SupportVectorMachine/SupportVectorMachine.php
102:        ?float $gamma = null,

lib/mlbackend/php/phpml/src/Phpml/NeuralNetwork/Network/MultilayerPerceptron.php
62:    public function __construct(int $inputLayerFeatures, array $hiddenLayers, array $classes, int $iterations = 10000, ?ActivationFunction $activationFunction = null, float $learningRate = 1)
161:    private function addNeuronLayers(array $layers, ?ActivationFunction $defaultActivationFunction = null): void

lib/mlbackend/php/phpml/src/Phpml/NeuralNetwork/Layer.php
20:    public function __construct(int $nodesNumber = 0, string $nodeClass = Neuron::class, ?ActivationFunction $activationFunction = null)
44:    private function createNode(string $nodeClass, ?ActivationFunction $activationFunction = null): Node

lib/mlbackend/php/phpml/src/Phpml/NeuralNetwork/Node/Neuron/Synapse.php
24:    public function __construct(Node $node, ?float $weight = null)

lib/mlbackend/php/phpml/src/Phpml/NeuralNetwork/Node/Neuron.php
34:    public function __construct(?ActivationFunction $activationFunction = null)

lib/mlbackend/php/phpml/src/Phpml/Math/Statistic/Covariance.php
16:    public static function fromXYArrays(array $x, array $y, bool $sample = true, ?float $meanX = null, ?float $meanY = null): float
54:    public static function fromDataset(array $data, int $i, int $k, bool $sample = true, ?float $meanX = null, ?float $meanY = null): float
117:    public static function covarianceMatrix(array $data, ?array $means = null): array

lib/mlbackend/php/phpml/src/Phpml/FeatureSelection/VarianceThreshold.php
38:    public function fit(array $samples, ?array $targets = null): void

lib/mlbackend/php/phpml/src/Phpml/FeatureSelection/SelectKBest.php
34:    public function __construct(int $k = 10, ?ScoringFunction $scoringFunction = null)
44:    public function fit(array $samples, ?array $targets = null): void

lib/mlbackend/php/phpml/src/Phpml/FeatureExtraction/TfIdfTransformer.php
23:    public function fit(array $samples, ?array $targets = null): void

lib/mlbackend/php/phpml/src/Phpml/FeatureExtraction/TokenCountVectorizer.php
37:    public function __construct(Tokenizer $tokenizer, ?StopWords $stopWords = null, float $minDF = 0.0)
44:    public function fit(array $samples, ?array $targets = null): void

lib/mlbackend/php/phpml/src/Phpml/DimensionReduction/LDA.php
52:    public function __construct(?float $totalVariance = null, ?int $numFeatures = null)

lib/mlbackend/php/phpml/src/Phpml/DimensionReduction/PCA.php
37:    public function __construct(?float $totalVariance = null, ?int $numFeatures = null)

lib/mlbackend/php/phpml/src/Phpml/DimensionReduction/KernelPCA.php
59:    public function __construct(int $kernel = self::KERNEL_RBF, ?float $totalVariance = null, ?int $numFeatures = null, ?float $gamma = null)

lib/mlbackend/php/phpml/src/Phpml/Preprocessing/Imputer.php
47:    public function fit(array $samples, ?array $targets = null): void

lib/mlbackend/php/phpml/src/Phpml/Preprocessing/Normalizer.php
51:    public function fit(array $samples, ?array $targets = null): void

lib/mlbackend/php/phpml/src/Phpml/Regression/SVR.php
18:        ?float $gamma = null,

lib/classes/analytics/analyser/users.php
44:    public function get_analysables_iterator(?string $action = null) {

lib/tests/behat/behat_general.php
779:        ?string $containerelement = null,
780:        ?string $containerselectortype = null
812:        ?string $containerelement = null,
813:        ?string $containerselectortype = null

mod/forum/classes/local/vaults/post_read_receipt_collection.php
63:    protected function generate_get_records_sql(string $wheresql = null, string $sortsql = null, ?int $userid = null) : string {

mod/forum/classes/local/vaults/forum.php
67:    protected function generate_get_records_sql(string $wheresql = null, string $sortsql = null, ?int $userid = null) : string {

mod/forum/classes/local/vaults/post.php
72:    protected function generate_get_records_sql(string $wheresql = null, string $sortsql = null, ?int $userid = null) : string {

mod/forum/classes/local/vaults/discussion.php
64:    protected function generate_get_records_sql(string $wheresql = null, string $sortsql = null, ?int $userid = null) : string {

mod/forum/classes/local/vaults/discussion_list.php
102:    protected function generate_get_records_sql(string $wheresql = null, ?string $sortsql = null, ?int $userid = null) : string {

mod/forum/classes/local/factories/url.php
101:    public function get_forum_view_url_from_forum(forum_entity $forum, ?int $pageno = null,
102:            ?int $sortorder = null) : moodle_url {
115:    public function get_forum_view_url_from_course_module_id(int $coursemoduleid, ?int $pageno = null,
116:            ?int $sortorder = null) : moodle_url {

mod/forum/classes/local/vaults/db_table_vault.php
79:        ?int $userid = null) : string;

mod/forum/classes/local/vaults/author.php
61:    protected function generate_get_records_sql(string $wheresql = null, string $sortsql = null, ?int $userid = null) : string {

analytics/classes/local/analyser/by_course.php
44:    public function get_analysables_iterator(?string $action = null) {

analytics/classes/local/analyser/sitewide.php
44:    public function get_analysables_iterator(?string $action = null) {

analytics/classes/local/analyser/base.php
136:    public function get_analysables_iterator(?string $action = null) {
436:    protected function get_iterator_sql(string $tablename, int $contextlevel, ?string $action = null, ?string $tablealias = null) {
474:    protected function order_sql(?string $fieldname = null, string $order = 'ASC', ?string $tablealias = null) {

analytics/classes/analysis.php
566:            array &$dataset, ?array $calculatedtarget = null) {
644:    public static function fill_firstanalyses_cache(int $modelid, ?int $analysableid = null) {

analytics/classes/model_config.php
53:    public function __construct(?model $model = null) {