diff --git a/src/ChurchCRM/MICRFunctions.php b/src/ChurchCRM/MICRFunctions.php
index 78e9c6ea4c..e6566ce09d 100644
--- a/src/ChurchCRM/MICRFunctions.php
+++ b/src/ChurchCRM/MICRFunctions.php
@@ -6,24 +6,24 @@
 
 class MICRFunctions
 {
-    public $CHECKNO_FIRST = 1; // o<check>o t<route>t <account>o
-    public $ROUTE_FIRST1 = 2;   // t<route>t <account>o <check>
-    public $ROUTE_FIRST2 = 3;   // t<route>t o<account>o <check>
-    public $NOT_RECOGNIZED = 4;
+    public int $CHECKNO_FIRST = 1; // o<check>o t<route>t <account>o
+    public int $ROUTE_FIRST1 = 2;   // t<route>t <account>o <check>
+    public int $ROUTE_FIRST2 = 3;   // t<route>t o<account>o <check>
+    public int $NOT_RECOGNIZED = 4;
 
-    public function identifyFormat($micr)
+    public function identifyFormat(string $micr): int
     {
         // t000000000t0000o0000000000000o ROUTE_FIRST2
         // t000000000t 0000000000o   0000 ROUTE_FIRST1
         // o000000o t000000000t 0000000000o CHECKNO_FIRST
 
         $firstChar = mb_substr($micr, 0, 1);
-        if ($firstChar == 'o') {
+        if ($firstChar === 'o') {
             return $this->CHECKNO_FIRST;
         } elseif ($firstChar == 't') {
             $firstSmallO = strpos($micr, 'o');
             $secondSmallO = strrpos($micr, 'o');
-            if ($firstSmallO == $secondSmallO) {
+            if ($firstSmallO === $secondSmallO) {
                 // Only one 'o'
                 $len = strlen($micr);
                 if ($len - $firstSmallO > 12) {
@@ -35,9 +35,11 @@ public function identifyFormat($micr)
                 return $this->ROUTE_FIRST2;
             }
         }
+
+        throw new \InvalidArgumentException('Unknown format provided');
     }
 
-    public function findRoute($micr): string
+    public function findRoute(string $micr): string
     {
         $routeAndAccount = $this->findRouteAndAccount($micr);
         $breakChar = strpos($routeAndAccount, 't', 1);
@@ -45,7 +47,7 @@ public function findRoute($micr): string
         return mb_substr($micr, 1, $breakChar - 1);
     }
 
-    public function findAccount($micr): string
+    public function findAccount(string $micr): string
     {
         $routeAndAccount = $this->findRouteAndAccount($micr);
         $breakChar = strpos($routeAndAccount, 't', 1);
@@ -53,7 +55,7 @@ public function findAccount($micr): string
         return mb_substr($routeAndAccount, $breakChar + 1, strlen($micr) - $breakChar);
     }
 
-    public function findRouteAndAccount($micr)
+    public function findRouteAndAccount(string $micr): string
     {
         $formatID = $this->identifyFormat($micr);
 
@@ -78,7 +80,7 @@ public function findRouteAndAccount($micr)
         }
     }
 
-    public function findCheckNo($micr): string
+    public function findCheckNo(string $micr): string
     {
         $formatID = $this->identifyFormat($micr);
         if ($formatID == $this->CHECKNO_FIRST) {
diff --git a/src/ChurchCRM/SQLUtils.php b/src/ChurchCRM/SQLUtils.php
index a5de2e61bf..36dfeb3209 100644
--- a/src/ChurchCRM/SQLUtils.php
+++ b/src/ChurchCRM/SQLUtils.php
@@ -71,8 +71,7 @@ public static function sqlImport(string $fileName, $mysqli): void
     /**
      * Remove comments from sql.
      *
-     * @param string sql
-     * @param bool is multicomment line
+     * @param bool $isMultiComment is multicomment line
      *
      * @return string
      */
@@ -94,7 +93,7 @@ private static function clearSQL($sql, &$isMultiComment)
         while (preg_match('{--\s|#|/\*[^!]}sUi', $sql, $matched, PREG_OFFSET_CAPTURE, $offset)) {
             [$comment, $foundOn] = $matched[0];
             if (self::isQuoted($foundOn, $sql)) {
-                $offset = $foundOn + strlen($comment);
+                $offset = (int) $foundOn + strlen($comment);
             } else {
                 if (mb_substr($comment, 0, 2) == '/*') {
                     $closedOn = strpos($sql, '*/', $foundOn);
@@ -116,11 +115,8 @@ private static function clearSQL($sql, &$isMultiComment)
 
     /**
      * Check if "offset" position is quoted.
-     *
-     * @param int    $offset
-     * @param string $text
      */
-    private static function isQuoted($offset, $text): bool
+    private static function isQuoted(int $offset, string $text): bool
     {
         if ($offset > strlen($text)) {
             $offset = strlen($text);
diff --git a/src/ChurchCRM/Service/AppIntegrityService.php b/src/ChurchCRM/Service/AppIntegrityService.php
index 60da47956b..cb06a3fcdb 100644
--- a/src/ChurchCRM/Service/AppIntegrityService.php
+++ b/src/ChurchCRM/Service/AppIntegrityService.php
@@ -256,7 +256,7 @@ public static function hasModRewrite(): bool
                     $header['status'] = $line;
                 }
 
-                list($key, $value) = explode(': ', $line);
+                [$key, $value] = explode(': ', $line);
                 $header[$key] = $value;
             }
 
diff --git a/src/ChurchCRM/Service/FinancialService.php b/src/ChurchCRM/Service/FinancialService.php
index 418d75338d..4d6c709434 100644
--- a/src/ChurchCRM/Service/FinancialService.php
+++ b/src/ChurchCRM/Service/FinancialService.php
@@ -17,13 +17,13 @@
 
 class FinancialService
 {
-    public function deletePayment($groupKey): void
+    public function deletePayment(string $groupKey): void
     {
         requireUserGroupMembership('bFinance');
         PledgeQuery::create()->findOneByGroupKey($groupKey)->delete();
     }
 
-    public function getMemberByScanString($tScanString): array
+    public function getMemberByScanString(string $tScanString): array
     {
         requireUserGroupMembership('bFinance');
 
diff --git a/src/ChurchCRM/Service/PersonService.php b/src/ChurchCRM/Service/PersonService.php
index 127f6ca40c..76f0049b03 100644
--- a/src/ChurchCRM/Service/PersonService.php
+++ b/src/ChurchCRM/Service/PersonService.php
@@ -10,7 +10,7 @@ class PersonService
     /**
      * @return array<mixed, array<'address'|'displayName'|'familyID'|'familyRole'|'firstName'|'id'|'lastName'|'role'|'thumbnailURI'|'title'|'uri', mixed>>
      */
-    public function search(string $searchTerm, $includeFamilyRole = true): array
+    public function search(string $searchTerm, bool $includeFamilyRole = true): array
     {
         $searchLikeString = '%' . $searchTerm . '%';
         $people = PersonQuery::create()
diff --git a/src/ChurchCRM/Service/SystemService.php b/src/ChurchCRM/Service/SystemService.php
index 308e900641..727130b246 100644
--- a/src/ChurchCRM/Service/SystemService.php
+++ b/src/ChurchCRM/Service/SystemService.php
@@ -4,6 +4,7 @@
 
 use ChurchCRM\Backup\BackupJob;
 use ChurchCRM\Backup\BackupType;
+use ChurchCRM\dto\Prerequisite;
 use ChurchCRM\dto\SystemConfig;
 use ChurchCRM\dto\SystemURLs;
 use ChurchCRM\Utils\ChurchCRMReleaseManager;
@@ -73,13 +74,13 @@ public static function getPrerequisiteStatus(): string
     {
         if (AppIntegrityService::arePrerequisitesMet()) {
             return 'All Prerequisites met';
-        } else {
-            $unmet = AppIntegrityService::getUnmetPrerequisites();
+        }
 
-            $unmetNames = array_map(fn ($o): string => $o->getName(), $unmet);
+        $unmet = AppIntegrityService::getUnmetPrerequisites();
 
-            return 'Missing Prerequisites: ' . json_encode(array_values($unmetNames), JSON_THROW_ON_ERROR);
-        }
+        $unmetNames = array_map(fn (Prerequisite $o): string => $o->getName(), $unmet);
+
+        return 'Missing Prerequisites: ' . json_encode(array_values($unmetNames), JSON_THROW_ON_ERROR);
     }
 
     private static function isTimerThresholdExceeded(string $LastTime, int $ThresholdHours): bool
diff --git a/src/ChurchCRM/data/Countries.php b/src/ChurchCRM/data/Countries.php
index 1f0957ed3b..2c2008b25e 100644
--- a/src/ChurchCRM/data/Countries.php
+++ b/src/ChurchCRM/data/Countries.php
@@ -277,7 +277,7 @@ public static function getNames(): array
     {
         self::initializeCountries();
 
-        return array_map([__CLASS__, 'getSingleName'], self::$countries);
+        return array_map([self::class, 'getSingleName'], self::$countries);
     }
 
     public static function getAll(): array
diff --git a/src/ChurchCRM/utils/InputUtils.php b/src/ChurchCRM/utils/InputUtils.php
index 1e1dc082e7..ef3c65cab5 100644
--- a/src/ChurchCRM/utils/InputUtils.php
+++ b/src/ChurchCRM/utils/InputUtils.php
@@ -8,7 +8,7 @@ class InputUtils
 {
     private static string $AllowedHTMLTags = '<a><b><i><u><h1><h2><h3><h4><h5><h6><pre><address><img><table><td><tr><ol><li><ul><p><sub><sup><s><hr><span><blockquote><div><small><big><tt><code><kbd><samp><del><ins><cite><q>';
 
-    public static function legacyFilterInputArr(array $arr, $key, $type = 'string', $size = 1)
+    public static function legacyFilterInputArr(array $arr, $key, $type = 'string', $size = 1): string|int|float
     {
         if (array_key_exists($key, $arr)) {
             return InputUtils::legacyFilterInput($arr[$key], $type, $size);
@@ -89,7 +89,7 @@ public static function filterDate($sInput): string
     // Sanitizes user input as a security measure
     // Optionally, a filtering type and size may be specified.  By default, strip any tags from a string.
     // Note that a database connection must already be established for the mysqli_real_escape_string function to work.
-    public static function legacyFilterInput($sInput, $type = 'string', $size = 1)
+    public static function legacyFilterInput($sInput, $type = 'string', $size = 1): string|int|float
     {
         global $cnInfoCentral;
         if (strlen($sInput) > 0) {
diff --git a/src/EventEditor.php b/src/EventEditor.php
index 52cc4c1e51..37f821d0ec 100644
--- a/src/EventEditor.php
+++ b/src/EventEditor.php
@@ -44,7 +44,6 @@
 $iErrors = 0;
 
 if ($sAction === 'Create Event' && !empty($tyid)) {
-
     // User is coming from the event types screen and thus there
     // is no existing event in the event_event table
     //
diff --git a/src/Reports/AdvancedDeposit.php b/src/Reports/AdvancedDeposit.php
index 160867980f..aeaab3c402 100644
--- a/src/Reports/AdvancedDeposit.php
+++ b/src/Reports/AdvancedDeposit.php
@@ -221,7 +221,7 @@ public function printRightJustified($x, $y, $str): void
             $this->Write(8, $str);
         }
 
-        public function startFirstPage()
+        public function startFirstPage(): int|float
         {
             global $sDateStart, $sDateEnd, $sort, $iDepID, $datetype;
             $this->addPage();
diff --git a/src/Reports/EnvelopeReport.php b/src/Reports/EnvelopeReport.php
index cfb62db7f9..94f2d27430 100644
--- a/src/Reports/EnvelopeReport.php
+++ b/src/Reports/EnvelopeReport.php
@@ -84,7 +84,7 @@ public function sGetFamilyString(Family $family): string
     }
 
     // Number of lines is only for the $text parameter
-    public function addRecord($text, $numlines): void
+    public function addRecord($text, int $numlines): void
     {
         // Add an extra blank line after record
         $numlines++;
@@ -105,7 +105,6 @@ public function addRecord($text, $numlines): void
 $families = FamilyQuery::Create()->orderByEnvelope()->filterByEnvelope(0, 'Criteria::GREATER_THAN')->find();
 
 foreach ($families as $family) {
-    $OutStr = '';
     $OutStr = $pdf->sGetFamilyString($family);
 
     // Count the number of lines in the output string
diff --git a/src/Reports/PhotoBook.php b/src/Reports/PhotoBook.php
index 376f8e6fc0..2645b5b661 100644
--- a/src/Reports/PhotoBook.php
+++ b/src/Reports/PhotoBook.php
@@ -20,7 +20,7 @@
 class PdfPhotoBook extends ChurchInfoReport
 {
     private $group;
-    private $FYIDString;
+    private string $FYIDString;
     private ?int $currentX = null;
     private ?int $currentY = null;
     private int $pageMarginL = 15;
diff --git a/src/v2/templates/admin/debug.php b/src/v2/templates/admin/debug.php
index 46f42a8755..49cfdb4c05 100644
--- a/src/v2/templates/admin/debug.php
+++ b/src/v2/templates/admin/debug.php
@@ -197,7 +197,7 @@
                 <p><?= gettext('Details:') ?> <?= AppIntegrityService::getIntegrityCheckMessage() ?></p>
                 <?php
                 if (count(AppIntegrityService::getFilesFailingIntegrityCheck()) > 0) {
-                ?>
+                    ?>
                     <p><?= gettext('Files failing integrity check') ?>:
                     <table class="display responsive no-wrap" width="100%" id="fileIntegrityCheckResultsTable">
                         <thead>
@@ -207,7 +207,7 @@
                         </thead>
                         <?php
                         foreach (AppIntegrityService::getFilesFailingIntegrityCheck() as $file) {
-                        ?>
+                            ?>
                             <tr>
                                 <td><?= $file->filename ?></td>
                                 <td><?= $file->expectedhash ?></td>
@@ -220,11 +220,11 @@
                                     } ?>
                                 </td>
                             </tr>
-                        <?php
+                            <?php
                         }
                         ?>
                     </table>
-                <?php
+                    <?php
                 }
                 ?>
             </div>