diff --git a/src/Symfony/Bundle/FrameworkBundle/KernelBrowser.php b/src/Symfony/Bundle/FrameworkBundle/KernelBrowser.php
index c80177c5d39c0..4fb751d4bfb32 100644
--- a/src/Symfony/Bundle/FrameworkBundle/KernelBrowser.php
+++ b/src/Symfony/Bundle/FrameworkBundle/KernelBrowser.php
@@ -115,7 +115,7 @@ public function loginUser(object $user, string $firewallContext = 'main'): stati
         }
 
         if (!$user instanceof UserInterface) {
-            throw new \LogicException(sprintf('The first argument of "%s" must be instance of "%s", "%s" provided.', __METHOD__, UserInterface::class, \is_object($user) ? \get_class($user) : \gettype($user)));
+            throw new \LogicException(sprintf('The first argument of "%s" must be instance of "%s", "%s" provided.', __METHOD__, UserInterface::class, get_debug_type($user)));
         }
 
         $token = new TestBrowserToken($user->getRoles(), $user, $firewallContext);
diff --git a/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php b/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php
index 87abb6a086f48..e19e05cfdaf6a 100644
--- a/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php
+++ b/src/Symfony/Component/Config/Definition/Dumper/YamlReferenceDumper.php
@@ -193,7 +193,7 @@ private function writeLine(string $text, int $indent = 0)
 
     private function writeArray(array $array, int $depth)
     {
-        $isIndexed = array_values($array) === $array;
+        $isIndexed = array_is_list($array);
 
         foreach ($array as $key => $value) {
             if (\is_array($value)) {
diff --git a/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php b/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php
index 83305808ddd42..751b4274dad74 100644
--- a/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php
+++ b/src/Symfony/Component/DomCrawler/Test/Constraint/CrawlerSelectorTextContains.php
@@ -56,7 +56,7 @@ protected function matches($crawler): bool
         $this->hasNode = true;
         $this->nodeText = $crawler->text(null, true);
 
-        return false !== mb_strpos($this->nodeText, $this->expectedText);
+        return str_contains($this->nodeText, $this->expectedText);
     }
 
     /**
diff --git a/src/Symfony/Component/ErrorHandler/Resources/views/exception.html.php b/src/Symfony/Component/ErrorHandler/Resources/views/exception.html.php
index c3e7a8674e743..8468fa76f4b32 100644
--- a/src/Symfony/Component/ErrorHandler/Resources/views/exception.html.php
+++ b/src/Symfony/Component/ErrorHandler/Resources/views/exception.html.php
@@ -35,7 +35,7 @@
             $last = $exceptionAsArrayCount - 1;
             foreach ($exceptionAsArray as $i => $e) {
                 foreach ($e['trace'] as $trace) {
-                    if ($trace['file'] && false === mb_strpos($trace['file'], '/vendor/') && false === mb_strpos($trace['file'], '/var/cache/') && $i < $last) {
+                    if ($trace['file'] && !str_contains($trace['file'], '/vendor/') && !str_contains($trace['file'], '/var/cache/') && $i < $last) {
                         $exceptionWithUserCode[] = $i;
                     }
                 }
diff --git a/src/Symfony/Component/ErrorHandler/Resources/views/traces.html.php b/src/Symfony/Component/ErrorHandler/Resources/views/traces.html.php
index f64d917138258..6ef37d67496bd 100644
--- a/src/Symfony/Component/ErrorHandler/Resources/views/traces.html.php
+++ b/src/Symfony/Component/ErrorHandler/Resources/views/traces.html.php
@@ -31,7 +31,7 @@
         <?php
         $isFirstUserCode = true;
         foreach ($exception['trace'] as $i => $trace) {
-            $isVendorTrace = $trace['file'] && (false !== mb_strpos($trace['file'], '/vendor/') || false !== mb_strpos($trace['file'], '/var/cache/'));
+            $isVendorTrace = $trace['file'] && (str_contains($trace['file'], '/vendor/') || str_contains($trace['file'], '/var/cache/'));
             $displayCodeSnippet = $isFirstUserCode && !$isVendorTrace;
             if ($displayCodeSnippet) {
                 $isFirstUserCode = false;
diff --git a/src/Symfony/Component/Filesystem/Path.php b/src/Symfony/Component/Filesystem/Path.php
index 0bbd5b4772aff..17e73a018a623 100644
--- a/src/Symfony/Component/Filesystem/Path.php
+++ b/src/Symfony/Component/Filesystem/Path.php
@@ -574,7 +574,7 @@ public static function makeRelative(string $path, string $basePath): string
      */
     public static function isLocal(string $path): bool
     {
-        return '' !== $path && false === mb_strpos($path, '://');
+        return '' !== $path && !str_contains($path, '://');
     }
 
     /**
@@ -638,7 +638,7 @@ public static function getLongestCommonBasePath(string ...$paths): ?string
 
                 // Prevent false positives for common prefixes
                 // see isBasePath()
-                if (0 === mb_strpos($path.'/', $basePath.'/')) {
+                if (str_starts_with($path.'/', $basePath.'/')) {
                     // next path
                     continue 2;
                 }
@@ -666,7 +666,7 @@ public static function join(string ...$paths): string
             if (null === $finalPath) {
                 // For first part we keep slashes, like '/top', 'C:\' or 'phar://'
                 $finalPath = $path;
-                $wasScheme = (false !== mb_strpos($path, '://'));
+                $wasScheme = str_contains($path, '://');
                 continue;
             }
 
@@ -717,7 +717,7 @@ public static function isBasePath(string $basePath, string $ofPath): bool
         // Don't append a slash for the root "/", because then that root
         // won't be discovered as common prefix ("//" is not a prefix of
         // "/foobar/").
-        return 0 === mb_strpos($ofPath.'/', rtrim($basePath, '/').'/');
+        return str_starts_with($ofPath.'/', rtrim($basePath, '/').'/');
     }
 
     /**
@@ -786,7 +786,7 @@ private static function split(string $path): array
         $length = mb_strlen($path);
 
         // Remove and remember root directory
-        if (0 === mb_strpos($path, '/')) {
+        if (str_starts_with($path, '/')) {
             $root .= '/';
             $path = $length > 1 ? mb_substr($path, 1) : '';
         } elseif ($length > 1 && ctype_alpha($path[0]) && ':' === $path[1]) {
diff --git a/src/Symfony/Component/Form/Form.php b/src/Symfony/Component/Form/Form.php
index 394f6a89f2b19..f404aece2557b 100644
--- a/src/Symfony/Component/Form/Form.php
+++ b/src/Symfony/Component/Form/Form.php
@@ -704,7 +704,7 @@ public function isEmpty(): bool
 
         return FormUtil::isEmpty($this->modelData) ||
             // arrays, countables
-            ((\is_array($this->modelData) || $this->modelData instanceof \Countable) && 0 === \count($this->modelData)) ||
+            (is_countable($this->modelData) && 0 === \count($this->modelData)) ||
             // traversables that are not countable
             ($this->modelData instanceof \Traversable && 0 === iterator_count($this->modelData));
     }
diff --git a/src/Symfony/Component/HttpClient/MockHttpClient.php b/src/Symfony/Component/HttpClient/MockHttpClient.php
index bce20971fdbb4..8df09120295dc 100644
--- a/src/Symfony/Component/HttpClient/MockHttpClient.php
+++ b/src/Symfony/Component/HttpClient/MockHttpClient.php
@@ -81,7 +81,7 @@ public function request(string $method, string $url, array $options = []): Respo
         ++$this->requestsCount;
 
         if (!$response instanceof ResponseInterface) {
-            throw new TransportException(sprintf('The response factory passed to MockHttpClient must return/yield an instance of ResponseInterface, "%s" given.', \is_object($response) ? \get_class($response) : \gettype($response)));
+            throw new TransportException(sprintf('The response factory passed to MockHttpClient must return/yield an instance of ResponseInterface, "%s" given.', get_debug_type($response)));
         }
 
         return MockResponse::fromRequest($method, $url, $options, $response);
diff --git a/src/Symfony/Component/Mime/Test/Constraint/EmailHtmlBodyContains.php b/src/Symfony/Component/Mime/Test/Constraint/EmailHtmlBodyContains.php
index 67ab85eb693f0..c9e0dc25b6987 100644
--- a/src/Symfony/Component/Mime/Test/Constraint/EmailHtmlBodyContains.php
+++ b/src/Symfony/Component/Mime/Test/Constraint/EmailHtmlBodyContains.php
@@ -43,7 +43,7 @@ protected function matches($message): bool
             throw new \LogicException('Unable to test a message HTML body on a RawMessage or Message instance.');
         }
 
-        return false !== mb_strpos($message->getHtmlBody(), $this->expectedText);
+        return str_contains($message->getHtmlBody(), $this->expectedText);
     }
 
     /**
diff --git a/src/Symfony/Component/Mime/Test/Constraint/EmailTextBodyContains.php b/src/Symfony/Component/Mime/Test/Constraint/EmailTextBodyContains.php
index f31655fd0fc52..4f55ce04bcb79 100644
--- a/src/Symfony/Component/Mime/Test/Constraint/EmailTextBodyContains.php
+++ b/src/Symfony/Component/Mime/Test/Constraint/EmailTextBodyContains.php
@@ -43,7 +43,7 @@ protected function matches($message): bool
             throw new \LogicException('Unable to test a message text body on a RawMessage or Message instance.');
         }
 
-        return false !== mb_strpos($message->getTextBody(), $this->expectedText);
+        return str_contains($message->getTextBody(), $this->expectedText);
     }
 
     /**
diff --git a/src/Symfony/Component/Security/Http/Authentication/AuthenticatorManager.php b/src/Symfony/Component/Security/Http/Authentication/AuthenticatorManager.php
index b36a9c5826aba..e174dfbfcbc5f 100644
--- a/src/Symfony/Component/Security/Http/Authentication/AuthenticatorManager.php
+++ b/src/Symfony/Component/Security/Http/Authentication/AuthenticatorManager.php
@@ -91,7 +91,7 @@ public function supports(Request $request): ?bool
         if (null !== $this->logger) {
             $context = ['firewall_name' => $this->firewallName];
 
-            if ($this->authenticators instanceof \Countable || \is_array($this->authenticators)) {
+            if (is_countable($this->authenticators)) {
                 $context['authenticators'] = \count($this->authenticators);
             }
 
diff --git a/src/Symfony/Component/Semaphore/Store/RedisStore.php b/src/Symfony/Component/Semaphore/Store/RedisStore.php
index bcc07cfeeaec4..153a39bb5182c 100644
--- a/src/Symfony/Component/Semaphore/Store/RedisStore.php
+++ b/src/Symfony/Component/Semaphore/Store/RedisStore.php
@@ -190,7 +190,7 @@ private function evaluate(string $script, string $resource, array $args): mixed
             return $this->redis->eval(...array_merge([$script, 1, $resource], $args));
         }
 
-        throw new InvalidArgumentException(sprintf('"%s()" expects being initialized with a Redis, RedisArray, RedisCluster or Predis\ClientInterface, "%s" given.', __METHOD__, \is_object($this->redis) ? \get_class($this->redis) : \gettype($this->redis)));
+        throw new InvalidArgumentException(sprintf('"%s()" expects being initialized with a Redis, RedisArray, RedisCluster or Predis\ClientInterface, "%s" given.', __METHOD__, get_debug_type($this->redis)));
     }
 
     private function getUniqueToken(Key $key): string
diff --git a/src/Symfony/Component/String/AbstractString.php b/src/Symfony/Component/String/AbstractString.php
index b66e3d20e4f52..75c9d3304e14c 100644
--- a/src/Symfony/Component/String/AbstractString.php
+++ b/src/Symfony/Component/String/AbstractString.php
@@ -558,7 +558,7 @@ abstract public function trimEnd(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FEFF
      */
     public function trimPrefix($prefix): static
     {
-        if (\is_array($prefix) || $prefix instanceof \Traversable) {
+        if (is_iterable($prefix)) {
             foreach ($prefix as $s) {
                 $t = $this->trimPrefix($s);
 
@@ -592,7 +592,7 @@ abstract public function trimStart(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FE
      */
     public function trimSuffix($suffix): static
     {
-        if (\is_array($suffix) || $suffix instanceof \Traversable) {
+        if (is_iterable($suffix)) {
             foreach ($suffix as $s) {
                 $t = $this->trimSuffix($s);