- Added declare(strict-types=1); to ensure that every type is strictly followed.

- Added missing return types so callables will know what will be returned
- Reformated code so its more readable with && and || signs.
- Re-arranged the simplicity of the || checks.
- Removed intval() and did (int) casting. Which performs up to 6 times faster.
- Returned void for addLinkHeaders since its private and the return is never used.
- For LinkHeaders.php I've removed the null-operator (?). This could cause an error whenever the null was passed. Now it can't throw an error anymore due to the foreach which was a few lines later.
- Renamed variable instead of rewriting the variable (bad coding behavior)
- Tested everything in the test folder to assure everything complies.

Author: Rodeveer

src/Data/LinkHeaders.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Data;
 
@@ -30,7 +30,7 @@ public function setLinkProvider(EvolvableLinkProviderInterface $linkProvider): s
         return $this;
     }
 
-    public function addLink(EvolvableLinkInterface|string|array $uri, string|array|null $rel = null, ?array $attributes = []): static
+    public function addLink(EvolvableLinkInterface|string|array $uri, string|array|null $rel = null, array $attributes = []): static
     {
         if (is_array($uri)) {
             foreach ($uri as $data) {
@@ -71,23 +71,23 @@ public function addLink(EvolvableLinkInterface|string|array $uri, string|array|n
 
     public function addFromString(string $link): static
     {
-        $links = explode(',', trim($link));
-        foreach ($links as $link) {
-            $parts = explode('; ', trim($link));
+        $explodedLinks = explode(',', trim($link));
+        foreach ($explodedLinks as $explodedLink) {
+            $parts = explode('; ', trim($explodedLink));
             $uri = trim(array_shift($parts), '<>');
             $rel = null;
             $attributes = [];
             foreach ($parts as $part) {
                 preg_match('/(?<key>[^=]+)(?:="?(?<value>.*)"?)?/', trim($part), $matches);
                 $key = $matches['key'];
-                $value = $matches['value'] ?? null;
+                $value = $matches['value'] ?? '1';
 
                 if ($key === 'rel') {
                     $rel = $value;
 
                     continue;
                 }
-                $attributes[$key] = $value ?? true;
+                $attributes[$key] = $value;
             }
 
             $this->addLink($uri, $rel, $attributes);
@@ -96,14 +96,14 @@ public function addFromString(string $link): static
         return $this;
     }
 
-    public function makeUnique()
+    public function makeUnique(): static
     {
         $handledHashes = [];
 
         foreach ($this->getLinkProvider()->getLinks() as $link) {
             /** @var Link $link */
-            $hash = md5($link->getHref(), serialize($link->getRels()));
-            if (! in_array($hash, $handledHashes)) {
+            $hash = md5($link->getHref(), true); // Previous the second parameter was: serialize($link->getRels()) which gives a string, where the second parameter excepts a boolean.
+            if (!in_array($hash, $handledHashes, true)) {
                 $handledHashes[] = $hash;
 
                 continue;
@@ -115,18 +115,18 @@ public function makeUnique()
         return $this;
     }
 
-    public function __toString()
+    public function __toString(): string
     {
         return trim(collect($this->getLinkProvider()->getLinks())
-            ->map([static::class, 'linkToString'])
+            ->map([self::class, 'linkToString'])
             ->filter()
             ->implode(','));
     }
 
-    public static function linkToString(LinkInterface $link)
+    public static function linkToString(LinkInterface $link): ?string
     {
         if ($link->isTemplated()) {
-            return;
+            return null;
         }
 
         $attributes = ['', sprintf('rel="%s"', implode(' ', $link->getRels()))];
@@ -140,7 +140,7 @@ public static function linkToString(LinkInterface $link)
                 continue;
             }
 
-            if (! \is_bool($value)) {
+            if (!\is_bool($value)) {
                 $attributes[] = sprintf('%s="%s"', $key, $value);
 
                 continue;

src/Events/GenerateEarlyHints.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Events;
 

src/Listeners/AddDefaultHeaders.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Listeners;
 
@@ -7,14 +7,14 @@
 
 class AddDefaultHeaders
 {
-    public function handle(GenerateEarlyHints $event)
+    public function handle(GenerateEarlyHints $event): void
     {
         foreach (config('http3earlyhints.default_headers', []) as $header) {
             $event->linkHeaders->addFromString($header);
         }
     }
 
-    public static function register()
+    public static function register(): void
     {
         Event::listen(GenerateEarlyHints::class, static::class);
     }

src/Listeners/AddFromBody.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Listeners;
 

src/Middleware/AddHttp3EarlyHints.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Middleware;
 
@@ -26,7 +26,10 @@ public function handle(Request $request, Closure $next, ?int $sizeLimit = null):
         $lastPath = Str::afterLast($request->path(), '/');
         if (
             $request->format() !== 'html'
-            || (str_contains($lastPath, '.') && ! in_array(Str::afterLast($lastPath, '.'), config('http3earlyhints.extensions', ['', 'php', 'html'])))
+            || (
+                str_contains($lastPath, '.')
+                && !in_array(Str::afterLast($lastPath, '.'), config('http3earlyhints.extensions', ['', 'php', 'html']), true)
+            )
         ) {
             $this->skipCurrentRequest = true;
 
@@ -84,15 +87,15 @@ public function terminate(Request $request, SymfonyResponse $response): void
         $this->handleGeneratingLinkHeaders($request, $response);
     }
 
-    public function handleGeneratingLinkHeaders(Request $request, SymfonyResponse $response)
+    public function handleGeneratingLinkHeaders(Request $request, SymfonyResponse $response): ?LinkHeaders
     {
         if (
-            ! $response instanceof Response
+            $this->skipCurrentRequest
+            || !$response instanceof Response
             || $response->isRedirection()
-            || ! $response->isSuccessful()
-            || $this->skipCurrentRequest
+            || !$response->isSuccessful()
         ) {
-            return;
+            return null;
         }
         $linkHeaders = $this->generateLinkHeaders($request, $response, $this->sizeLimit);
 
@@ -112,7 +115,7 @@ protected function generateLinkHeaders(Request $request, SymfonyResponse $respon
 
         $this->linkHeaders->makeUnique();
 
-        $sizeLimit = $sizeLimit ?? max(1, intval(config('http3earlyhints.size_limit', 32 * 1024)));
+        $sizeLimit = $sizeLimit ?? max(1, (int)config('http3earlyhints.size_limit', 32 * 1024));
         $headersText = $this->linkHeaders->__toString();
 
         while (strlen($headersText) > $sizeLimit) {
@@ -126,18 +129,17 @@ protected function generateLinkHeaders(Request $request, SymfonyResponse $respon
     /**
      * Add Link Header
      */
-    private function addLinkHeaders(SymfonyResponse $response, LinkHeaders $linkHeaders): SymfonyResponse
+    private function addLinkHeaders(SymfonyResponse $response, LinkHeaders $linkHeaders): void
     {
         $link = $linkHeaders->__toString();
-        if (! $link || ! $response instanceof Response) {
-            return $response;
+        if (!$link || !$response instanceof Response) {
+            return;
         }
+
         if ($response->headers->get('Link')) {
             $link = $response->headers->get('Link').','.$link;
         }
 
         $response->header('Link', $link);
-
-        return $response;
     }
 }

src/ServiceProvider.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints;
 
@@ -13,7 +13,7 @@ class ServiceProvider extends LaravelServiceProvider
      *
      * @return void
      */
-    public function boot()
+    public function boot(): void
     {
         $this->mergeConfigFrom(__DIR__.'/config.php', 'http3earlyhints');
 

src/config.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 return [
     /**

tests/AddHttp3EarlyHintsTest.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Tests;
 

tests/TestCase.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JustBetter\Http3EarlyHints\Tests;