Move array_merge calls out of loops to improve performance

Author: simonberger

DebugClassLoader.php

@@ -800,7 +800,7 @@ private function setReturnType(string $types, string $class, string $method, str
                 continue;
             }
 
-            $docTypes = array_merge($docTypes, $t);
+            $docTypes[] = $t;
 
             if ('mixed' === $n || 'void' === $n) {
                 $nullable = false;
@@ -817,6 +817,7 @@ private function setReturnType(string $types, string $class, string $method, str
                 $phpTypes[] = $n;
             }
         }
+        $docTypes = array_merge([], ...$docTypes);
 
         if (!$phpTypes) {
             return;

ErrorEnhancer/ClassNotFoundErrorEnhancer.php

@@ -93,19 +93,19 @@ private function getClassCandidates(string $class): array
             if ($function[0] instanceof ClassLoader) {
                 foreach ($function[0]->getPrefixes() as $prefix => $paths) {
                     foreach ($paths as $path) {
-                        $classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
+                        $classes[] = $this->findClassInPath($path, $class, $prefix);
                     }
                 }
 
                 foreach ($function[0]->getPrefixesPsr4() as $prefix => $paths) {
                     foreach ($paths as $path) {
-                        $classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
+                        $classes[] = $this->findClassInPath($path, $class, $prefix);
                     }
                 }
             }
         }
 
-        return array_unique($classes);
+        return array_unique(array_merge([], ...$classes));
     }
 
     private function findClassInPath(string $path, string $class, string $prefix): array