diff --git a/src/Composer/Filter/PlatformRequirementFilter/IgnoreListPlatformRequirementFilter.php b/src/Composer/Filter/PlatformRequirementFilter/IgnoreListPlatformRequirementFilter.php
index 9359c57affaa..43cc33469bb5 100644
--- a/src/Composer/Filter/PlatformRequirementFilter/IgnoreListPlatformRequirementFilter.php
+++ b/src/Composer/Filter/PlatformRequirementFilter/IgnoreListPlatformRequirementFilter.php
@@ -39,7 +39,7 @@ final class IgnoreListPlatformRequirementFilter implements PlatformRequirementFi
      */
     public function __construct(array $reqList)
     {
-        $ignoreAll = $ignoreUpperBound = array();
+        $ignoreAll = $ignoreUpperBound = [];
         foreach ($reqList as $req) {
             if (substr($req, -1) === '+') {
                 $ignoreUpperBound[] = substr($req, 0, -1);
@@ -51,11 +51,7 @@ public function __construct(array $reqList)
         $this->ignoreUpperBoundRegex = BasePackage::packageNamesToRegexp($ignoreUpperBound);
     }
 
-    /**
-     * @param string $req
-     * @return bool
-     */
-    public function isIgnored($req)
+    public function isIgnored(string $req): bool
     {
         if (!PlatformRepository::isPlatformPackage($req)) {
             return false;
@@ -65,11 +61,9 @@ public function isIgnored($req)
     }
 
     /**
-     * @param string $req
-     * @return ConstraintInterface
      * @param bool $allowUpperBoundOverride For conflicts we do not want the upper bound to be skipped
      */
-    public function filterConstraint($req, ConstraintInterface $constraint, $allowUpperBoundOverride = true)
+    public function filterConstraint(string $req, ConstraintInterface $constraint, bool $allowUpperBoundOverride = true): ConstraintInterface
     {
         if (!PlatformRepository::isPlatformPackage($req)) {
             return $constraint;
@@ -86,7 +80,7 @@ public function filterConstraint($req, ConstraintInterface $constraint, $allowUp
         $intervals = Intervals::get($constraint);
         $last = end($intervals['numeric']);
         if ($last !== false && (string) $last->getEnd() !== (string) Interval::untilPositiveInfinity()) {
-            $constraint = new MultiConstraint(array($constraint, new Constraint('>=', $last->getEnd()->getVersion())), false);
+            $constraint = new MultiConstraint([$constraint, new Constraint('>=', $last->getEnd()->getVersion())], false);
         }
 
         return $constraint;