diff --git a/Sources/Actions/Admin/Find.php b/Sources/Actions/Admin/Find.php
index 2c19b9c9fb6..d4ff43e1e7e 100644
--- a/Sources/Actions/Admin/Find.php
+++ b/Sources/Actions/Admin/Find.php
@@ -23,6 +23,7 @@
 use SMF\User;
 use SMF\Utils;
 use SMF\WebFetch\WebFetchApi;
+use SMF\PackageManager\XmlArray;
 
 /**
  * Provides the search functionality inside the admin control panel.
diff --git a/Sources/BBCodeParser.php b/Sources/BBCodeParser.php
index 572d82707b0..0e747a57a09 100644
--- a/Sources/BBCodeParser.php
+++ b/Sources/BBCodeParser.php
@@ -1143,7 +1143,7 @@ function ($a, $b) {
 	 *
 	 * @param string|bool $message The string to parse.
 	 * @param bool $smileys Whether to parse smileys. Default: true.
-	 * @param string $cache_id The cache ID.
+	 * @param string|int $cache_id The cache ID.
 	 *    If $cache_id is left empty, an ID will be generated automatically.
 	 *    Manually specifiying a ID is helpful in cases when an integration hook
 	 *    wants to identify particular strings to act upon, but is otherwise
@@ -1151,7 +1151,7 @@ function ($a, $b) {
 	 * @param array $parse_tags If set, only parses these tags rather than all of them.
 	 * @return string The parsed string.
 	 */
-	public function parse(string $message, bool $smileys = true, string $cache_id = '', array $parse_tags = []): string
+	public function parse(string $message, bool $smileys = true, string|int $cache_id = '', array $parse_tags = []): string
 	{
 		// Don't waste cycles
 		if (strval($message) === '') {
diff --git a/Sources/Search/APIs/Custom.php b/Sources/Search/APIs/Custom.php
index f0b8ba8e8e6..18fd18a7e2b 100644
--- a/Sources/Search/APIs/Custom.php
+++ b/Sources/Search/APIs/Custom.php
@@ -11,18 +11,21 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\Search\APIs;
 
 use SMF\Config;
 use SMF\Db\DatabaseApi as Db;
 use SMF\Search\SearchApi;
 use SMF\Utils;
+use SMF\Search\SearchApiInterface;
 
 /**
  * Used for the "custom search index" option
  * Class Custom
  */
-class Custom extends SearchApi
+class Custom extends SearchApi implements SearchApiInterface
 {
 	/**
 	 * @var array Index settings
@@ -71,7 +74,7 @@ public function __construct()
 	/**
 	 * {@inheritDoc}
 	 */
-	public function supportsMethod($methodName, $query_params = null): bool
+	public function supportsMethod(string $methodName, array $query_params = []): bool
 	{
 		$return = false;
 
@@ -109,7 +112,7 @@ public function isValid(): bool
 	/**
 	 * {@inheritDoc}
 	 */
-	public function searchSort($a, $b): int
+	public function searchSort(string $a, string $b): int
 	{
 		global $excludedWords;
 
@@ -122,7 +125,7 @@ public function searchSort($a, $b): int
 	/**
 	 * {@inheritDoc}
 	 */
-	public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude, $isExcluded): void
+	public function prepareIndexes(string $word, array &$wordsSearch, array &$wordsExclude, bool $isExcluded): void
 	{
 		$subwords = Utils::text2words($word, $this->min_word_length, true);
 
@@ -136,7 +139,7 @@ public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude,
 		}
 
 		foreach ($subwords as $subword) {
-			if (Utils::entityStrlen($subword) >= $this->min_word_length && !in_array($subword, $this->bannedWords)) {
+			if (Utils::entityStrlen((string) $subword) >= $this->min_word_length && !in_array($subword, $this->bannedWords)) {
 				$wordsSearch['indexed_words'][] = $subword;
 
 				if ($isExcluded) {
@@ -149,7 +152,7 @@ public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude,
 	/**
 	 * {@inheritDoc}
 	 */
-	public function indexedWordQuery(array $words, array $search_data)
+	public function indexedWordQuery(array $words, array $search_data): mixed
 	{
 		$query_select = [
 			'id_msg' => 'm.id_msg',
@@ -202,7 +205,7 @@ public function indexedWordQuery(array $words, array $search_data)
 		$count = 0;
 
 		if (!empty($query_params['excluded_phrases']) && empty(Config::$modSettings['search_force_index'])) {
-			foreach ($query_params['excluded_phrases'] as $phrase) {
+			foreach ($query_params['excluded_phrases'] as $excludedWord) {
 				$query_where[] = 'subject NOT ' . $this->query_match_type . ' {string:exclude_subject_words_' . $count . '}';
 
 				if ($this->query_match_type === 'RLIKE') {
diff --git a/Sources/Search/APIs/Fulltext.php b/Sources/Search/APIs/Fulltext.php
index 499d58fa11b..6b031a15fd0 100644
--- a/Sources/Search/APIs/Fulltext.php
+++ b/Sources/Search/APIs/Fulltext.php
@@ -11,18 +11,21 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\Search\APIs;
 
 use SMF\Config;
 use SMF\Db\DatabaseApi as Db;
 use SMF\Search\SearchApi;
 use SMF\Utils;
+use SMF\Search\SearchApiInterface;
 
 /**
  * Class Fulltext
  * Used for fulltext index searching
  */
-class Fulltext extends SearchApi
+class Fulltext extends SearchApi implements SearchApiInterface
 {
 	/**
 	 * @var array Which words are banned
@@ -60,7 +63,7 @@ public function __construct()
 	/**
 	 * {@inheritDoc}
 	 */
-	public function supportsMethod($methodName, $query_params = null): bool
+	public function supportsMethod(string $methodName, array $query_params = []): bool
 	{
 		$return = false;
 
@@ -92,7 +95,7 @@ public function supportsMethod($methodName, $query_params = null): bool
 	 *
 	 * @return int The minimum word length
 	 */
-	protected function _getMinWordLength()
+	protected function _getMinWordLength(): int
 	{
 		if (Config::$db_type == 'postgresql') {
 			return 0;
@@ -118,13 +121,13 @@ protected function _getMinWordLength()
 			$min_word_length = 4;
 		}
 
-		return $min_word_length;
+		return (int) $min_word_length;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function searchSort($a, $b): int
+	public function searchSort(string $a, string $b): int
 	{
 		global $excludedWords;
 
@@ -137,7 +140,7 @@ public function searchSort($a, $b): int
 	/**
 	 * {@inheritDoc}
 	 */
-	public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude, $isExcluded): void
+	public function prepareIndexes(string $word, array &$wordsSearch, array &$wordsExclude, bool $isExcluded): void
 	{
 		$subwords = Utils::text2words($word, PHP_INT_MAX, false);
 
@@ -168,7 +171,7 @@ public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude,
 	/**
 	 * {@inheritDoc}
 	 */
-	public function indexedWordQuery(array $words, array $search_data)
+	public function indexedWordQuery(array $words, array $search_data): mixed
 	{
 		$query_select = [
 			'id_msg' => 'm.id_msg',
diff --git a/Sources/Search/APIs/Standard.php b/Sources/Search/APIs/Standard.php
index f4d1bed09d2..26866ff3209 100644
--- a/Sources/Search/APIs/Standard.php
+++ b/Sources/Search/APIs/Standard.php
@@ -11,19 +11,22 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\Search\APIs;
 
 use SMF\Search\SearchApi;
+use SMF\Search\SearchApiInterface;
 
 /**
  * Standard non full index, non custom index search
  */
-class Standard extends SearchApi
+class Standard extends SearchApi implements SearchApiInterface
 {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function supportsMethod($methodName, $query_params = null): bool
+	public function supportsMethod(string $methodName, array $query_params = []): bool
 	{
 		$return = false;
 
diff --git a/Sources/Search/SearchApi.php b/Sources/Search/SearchApi.php
index d99278da112..dbc0dd3b3e3 100644
--- a/Sources/Search/SearchApi.php
+++ b/Sources/Search/SearchApi.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\Search;
 
 use SMF\BackwardCompatibility;
@@ -22,6 +24,7 @@
 use SMF\PackageManager\SubsPackage;
 use SMF\User;
 use SMF\Utils;
+use SMF\Actions\Search;
 
 /**
  * Class SearchApi
@@ -399,7 +402,7 @@ public function __construct()
 	/**
 	 * {@inheritDoc}
 	 */
-	public function supportsMethod($methodName, $query_params = []): bool
+	public function supportsMethod(string $methodName, array $query_params = []): bool
 	{
 		switch ($methodName) {
 			case 'postRemoved':
@@ -421,26 +424,28 @@ public function supportsMethod($methodName, $query_params = []): bool
 	 */
 	public function isValid(): bool
 	{
+		return false;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function searchSort($a, $b): int
+	public function searchSort(string $a, string $b): int
 	{
+		return 0;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude, $isExcluded): void
+	public function prepareIndexes(string $word, array &$wordsSearch, array &$wordsExclude, bool $isExcluded): void
 	{
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function indexedWordQuery(array $words, array $search_data)
+	public function indexedWordQuery(array $words, array $search_data): mixed
 	{
 	}
 
@@ -461,7 +466,7 @@ public function postModified(array &$msgOptions, array &$topicOptions, array &$p
 	/**
 	 * {@inheritDoc}
 	 */
-	public function postRemoved($id_msg): void
+	public function postRemoved(int $id_msg): void
 	{
 		$result = Db::$db->query(
 			'',
@@ -521,7 +526,7 @@ public function topicsRemoved(array $topics): void
 	/**
 	 * {@inheritDoc}
 	 */
-	public function topicsMoved(array $topics, $board_to): void
+	public function topicsMoved(array $topics, int $board_to): void
 	{
 	}
 
@@ -539,7 +544,7 @@ public function initializeSearch(): void
 	/**
 	 * {@inheritDoc}
 	 */
-	public function searchQuery(array $query_params, array $searchWords, array $excludedIndexWords, array &$participants, array &$searchArray)
+	public function searchQuery(array $query_params, array $searchWords, array $excludedIndexWords, array &$participants, array &$searchArray): void
 	{
 		$update_cache = empty($_SESSION['search_cache']) || ($_SESSION['search_cache']['params'] != $this->compressParams());
 
@@ -1068,7 +1073,7 @@ protected function setSearchTerms(): void
 		// .. first, we check for things like -"some words", but not "-some words".
 		foreach ($matches[1] as $index => $word) {
 			if ($word === '-') {
-				if (($word = trim($phraseArray[$index], '-_\' ')) !== '' && !in_array($word, $blacklisted_words)) {
+				if (($word = trim($phraseArray[$index], '-_\' ')) !== '' && !in_array($word, $this->blacklisted_words)) {
 					$this->excludedWords[] = $word;
 				}
 
@@ -1079,7 +1084,7 @@ protected function setSearchTerms(): void
 		// Now we look for -test, etc.... normaller.
 		foreach ($wordArray as $index => $word) {
 			if (strpos(trim($word), '-') === 0) {
-				if (($word = trim($word, '-_\' ')) !== '' && !in_array($word, $blacklisted_words)) {
+				if (($word = trim($word, '-_\' ')) !== '' && !in_array($word, $this->blacklisted_words)) {
 					$this->excludedWords[] = $word;
 				}
 
diff --git a/Sources/Search/SearchApiInterface.php b/Sources/Search/SearchApiInterface.php
index b049de81283..5a382c77eb4 100644
--- a/Sources/Search/SearchApiInterface.php
+++ b/Sources/Search/SearchApiInterface.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\Search;
 
 use SMF\Msg;
@@ -29,7 +31,7 @@ interface SearchApiInterface
 	 * @param array $query_params Any parameters for the query
 	 * @return bool Whether or not the specified method is supported
 	 */
-	public function supportsMethod($methodName, $query_params = []): bool;
+	public function supportsMethod(string $methodName, array $query_params = []): bool;
 
 	/**
 	 * Whether this method is valid for implementation or not.
@@ -47,7 +49,7 @@ public function isValid(): bool;
 	 * @param string $b Word B
 	 * @return int An integer indicating how the words should be sorted
 	 */
-	public function searchSort($a, $b): int;
+	public function searchSort(string $a, string $b): int;
 
 	/**
 	 * Callback while preparing indexes for searching.
@@ -57,7 +59,7 @@ public function searchSort($a, $b): int;
 	 * @param array $wordsExclude Words to exclude
 	 * @param bool $isExcluded Whether the specified word should be excluded
 	 */
-	public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude, $isExcluded): void;
+	public function prepareIndexes(string $word, array &$wordsSearch, array &$wordsExclude, bool $isExcluded): void;
 
 	/**
 	 * Search for indexed words.
@@ -66,7 +68,7 @@ public function prepareIndexes($word, array &$wordsSearch, array &$wordsExclude,
 	 * @param array $search_data An array of search data
 	 * @return mixed
 	 */
-	public function indexedWordQuery(array $words, array $search_data);
+	public function indexedWordQuery(array $words, array $search_data): mixed;
 
 	/**
 	 * Callback when a post is created.
@@ -95,7 +97,7 @@ public function postModified(array &$msgOptions, array &$topicOptions, array &$p
 	 *
 	 * @param int $id_msg The ID of the post that was removed
 	 */
-	public function postRemoved($id_msg): void;
+	public function postRemoved(int $id_msg): void;
 
 	/**
 	 * Callback when a topic is removed.
@@ -110,7 +112,7 @@ public function topicsRemoved(array $topics): void;
 	 * @param array $topics The ID(s) of the moved topic(s)
 	 * @param int $board_to The board that the topics were moved to
 	 */
-	public function topicsMoved(array $topics, $board_to): void;
+	public function topicsMoved(array $topics, int $board_to): void;
 
 	/**
 	 * Sets whatever properties are necessary in order to perform the search.
@@ -134,7 +136,7 @@ public function initializeSearch(): void;
 	 * @param array $searchArray
 	 * @return mixed
 	 */
-	public function searchQuery(array $query_params, array $searchWords, array $excludedIndexWords, array &$participants, array &$searchArray);
+	public function searchQuery(array $query_params, array $searchWords, array $excludedIndexWords, array &$participants, array &$searchArray): void;
 
 	/**
 	 * Figures out which search result topics the user participated in.
diff --git a/Sources/Search/SearchResult.php b/Sources/Search/SearchResult.php
index 11067f2fde6..8160151dd80 100644
--- a/Sources/Search/SearchResult.php
+++ b/Sources/Search/SearchResult.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\Search;
 
 use SMF\BackwardCompatibility;
@@ -409,7 +411,7 @@ public function format(int $counter = 0, array $format_options = []): array
 	 * @param array $query_customizations Customizations to the SQL query.
 	 * @return Generator<array> Iterating over result gives SearchResult instances.
 	 */
-	public static function get($ids, array $query_customizations = [])
+	public static function get(/*int|array*/ $ids, array $query_customizations = [])/*: Generator*/
 	{
 		$selects = $query_customizations['selects'] ?? [
 			'm.*',
diff --git a/Sources/WebFetch/APIs/CurlFetcher.php b/Sources/WebFetch/APIs/CurlFetcher.php
index bce9611c016..5a550b4f1e0 100644
--- a/Sources/WebFetch/APIs/CurlFetcher.php
+++ b/Sources/WebFetch/APIs/CurlFetcher.php
@@ -10,6 +10,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\WebFetch\APIs;
 
 use SMF\Lang;
@@ -193,14 +195,16 @@ public function __construct(array $options = [], int $max_redirect = 3)
 	 *  - Calls setOptions() to set the curl opts array values based on the
 	 *    defaults and user input.
 	 *
-	 * @param string $url the site we are going to fetch
+	 * @param string|Url $url the site we are going to fetch
 	 * @param array|string $post_data any post data as form name => value
 	 * @return object A reference to the object for method chaining.
 	 */
-	public function request(string $url, array|string $post_data = []): object
+	public function request(string|Url $url, array|string $post_data = []): object
 	{
-		$url = new Url($url, true);
-		$url->toAscii();
+		if (!$url instanceof Url){
+			$url = new Url($url, true);
+			$url->toAscii();
+		}
 
 		// If we can't do it, bail out.
 		if (!function_exists('curl_init')) {
@@ -232,7 +236,7 @@ public function request(string $url, array|string $post_data = []): object
 
 		// Set the options and get it.
 		$this->setOptions();
-		$this->sendRequest(str_replace(' ', '%20', $url));
+		$this->sendRequest(str_replace(' ', '%20', strval($url)));
 
 		return $this;
 	}
diff --git a/Sources/WebFetch/APIs/FtpFetcher.php b/Sources/WebFetch/APIs/FtpFetcher.php
index 8ad34687ca8..9d7edc23df0 100644
--- a/Sources/WebFetch/APIs/FtpFetcher.php
+++ b/Sources/WebFetch/APIs/FtpFetcher.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\WebFetch\APIs;
 
 use SMF\Config;
@@ -57,18 +59,18 @@ class FtpFetcher extends WebFetchApi
 	public string $error_message = '';
 
 	/**
-	 * @var int
+	 * @var string
 	 *
 	 * The user name to connect with.
 	 */
-	public int $user;
+	public string $user;
 
 	/**
-	 * @var int
+	 * @var string
 	 *
 	 * The email address to connect with.
 	 */
-	public int $email;
+	public string $email;
 
 	/**
 	 * @var array
@@ -101,13 +103,15 @@ public function __construct(?string $user = null, ?string $email = null)
 	 *  - Optionally will post data to the page form if $post_data is supplied.
 	 *    Passed arrays will be converted to a POST string joined with &'s.
 	 *
-	 * @param string $url the site we are going to fetch
+	 * @param string|Url $url the site we are going to fetch
 	 * @return object A reference to the object for method chaining.
 	 */
-	public function request(string $url, array|string $post_data = []): object
+	public function request(string|Url $url, array|string $post_data = []): object
 	{
-		$url = new Url($url, true);
-		$url->toAscii();
+		if (!$url instanceof Url){
+			$url = new Url($url, true);
+			$url->toAscii();
+		}
 
 		// Umm, this shouldn't happen?
 		if (empty($url->scheme) || !in_array($url->scheme, ['ftp', 'ftps'])) {
@@ -158,7 +162,7 @@ public function request(string $url, array|string $post_data = []): object
 
 		// The server should now say something in acknowledgement.
 		$ftp->check_response(150);
-		$this->response[0]['code'] = substr($this->last_message, 0, 3);
+		$this->response[0]['code'] = substr($ftp->last_message, 0, 3);
 
 		$body = '';
 
@@ -170,7 +174,7 @@ public function request(string $url, array|string $post_data = []): object
 
 		// All done, right?  Good.
 		$this->response[0]['success'] = $ftp->check_response(226);
-		$this->response[0]['code'] = substr($this->last_message, 0, 3);
+		$this->response[0]['code'] = substr($ftp->last_message, 0, 3);
 		$ftp->close();
 
 		$this->response[0]['body'] = $body;
diff --git a/Sources/WebFetch/APIs/SocketFetcher.php b/Sources/WebFetch/APIs/SocketFetcher.php
index a387c7b216d..bbbfddaecd1 100644
--- a/Sources/WebFetch/APIs/SocketFetcher.php
+++ b/Sources/WebFetch/APIs/SocketFetcher.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\WebFetch\APIs;
 
 use SMF\Lang;
@@ -135,14 +137,16 @@ public function __destruct()
 	 *  - Optionally will post data to the page form if $post_data is supplied.
 	 *    Passed arrays will be converted to a POST string joined with &'s.
 	 *
-	 * @param string $url the site we are going to fetch
+	 * @param string|Url $url the site we are going to fetch
 	 * @param array|string $post_data any post data as form name => value
 	 * @return object A reference to the object for method chaining.
 	 */
-	public function request(string $url, array|string $post_data = []): object
+	public function request(string|Url $url, array|string $post_data = []): object
 	{
-		$url = new Url($url, true);
-		$url->toAscii();
+		if (!$url instanceof Url){
+			$url = new Url($url, true);
+			$url->toAscii();
+		}
 
 		// Umm, this shouldn't happen?
 		if (empty($url->scheme) || !in_array($url->scheme, ['http', 'https'])) {
@@ -243,7 +247,7 @@ public function request(string $url, array|string $post_data = []): object
 
 			$this->current_redirect++;
 
-			return $this->request($location, $post_data);
+			return $this->request(strval($location), $post_data);
 		}
 
 		// Make sure we get a 200 OK.
diff --git a/Sources/WebFetch/WebFetchApi.php b/Sources/WebFetch/WebFetchApi.php
index 6eba083912a..04c44676738 100644
--- a/Sources/WebFetch/WebFetchApi.php
+++ b/Sources/WebFetch/WebFetchApi.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\WebFetch;
 
 use SMF\BackwardCompatibility;
@@ -80,8 +82,9 @@ abstract class WebFetchApi implements WebFetchApiInterface
 	/**
 	 * {@inheritDoc}
 	 */
-	public function request(string $url, array|string $post_data = []): object
+	public function request(string $url, array|string $post_data = []): ?object
 	{
+		return null;
 	}
 
 	/**
@@ -96,6 +99,7 @@ public function result(?string $area = null): mixed
 	 */
 	public function resultRaw(?int $response_number = null): array
 	{
+		return [];
 	}
 
 	/***********************
diff --git a/Sources/WebFetch/WebFetchApiInterface.php b/Sources/WebFetch/WebFetchApiInterface.php
index 2780f8ef905..1dbca2188e2 100644
--- a/Sources/WebFetch/WebFetchApiInterface.php
+++ b/Sources/WebFetch/WebFetchApiInterface.php
@@ -11,6 +11,8 @@
  * @version 3.0 Alpha 1
  */
 
+declare(strict_types=1);
+
 namespace SMF\WebFetch;
 
 /**
@@ -29,7 +31,7 @@ interface WebFetchApiInterface
 	 * @param array|string $post_data any post data as form name => value
 	 * @return object A reference to the object for method chaining.
 	 */
-	public function request(string $url, array $post_data = []): object;
+	public function request(string $url, array $post_data = []): ?object;
 
 	/**
 	 * Used to return the results to the caller.