diff --git a/UPGRADE-4.4.md b/UPGRADE-4.4.md
index 96c170675c..94ee06ee59 100644
--- a/UPGRADE-4.4.md
+++ b/UPGRADE-4.4.md
@@ -1,6 +1,11 @@
 UPGRADE FROM 4.3 to 4.4
 =======================
 
+Cache
+-----
+
+ * Added argument `$prefix` to `AdapterInterface::clear()`
+
 DependencyInjection
 -------------------
 
diff --git a/UPGRADE-5.0.md b/UPGRADE-5.0.md
index bb6f87dd00..d385784c30 100644
--- a/UPGRADE-5.0.md
+++ b/UPGRADE-5.0.md
@@ -16,6 +16,7 @@ Cache
  * Removed `CacheItem::getPreviousTags()`, use `CacheItem::getMetadata()` instead.
  * Removed all PSR-16 adapters, use `Psr16Cache` or `Symfony\Contracts\Cache\CacheInterface` implementations instead.
  * Removed `SimpleCacheAdapter`, use `Psr16Adapter` instead.
+ * Added argument `$prefix` to `AdapterInterface::clear()`
 
 Config
 ------
diff --git a/src/Symfony/Component/Cache/Adapter/AdapterInterface.php b/src/Symfony/Component/Cache/Adapter/AdapterInterface.php
index 85fe07684f..6da364d97f 100644
--- a/src/Symfony/Component/Cache/Adapter/AdapterInterface.php
+++ b/src/Symfony/Component/Cache/Adapter/AdapterInterface.php
@@ -34,4 +34,11 @@ interface AdapterInterface extends CacheItemPoolInterface
      * @return \Traversable|CacheItem[]
      */
     public function getItems(array $keys = []);
+
+    /**
+     * {@inheritdoc}
+     *
+     * @param string $prefix
+     */
+    public function clear(/*string $prefix = ''*/);
 }
diff --git a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
index 80aa7c6d1b..6cafed8ffd 100644
--- a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
@@ -192,14 +192,21 @@ class ChainAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
         $cleared = true;
         $i = $this->adapterCount;
 
         while ($i--) {
-            $cleared = $this->adapters[$i]->clear() && $cleared;
+            if ($this->adapters[$i] instanceof AdapterInterface) {
+                $cleared = $this->adapters[$i]->clear($prefix) && $cleared;
+            } else {
+                $cleared = $this->adapters[$i]->clear() && $cleared;
+            }
         }
 
         return $cleared;
diff --git a/src/Symfony/Component/Cache/Adapter/NullAdapter.php b/src/Symfony/Component/Cache/Adapter/NullAdapter.php
index 54cd453565..159d43e2c9 100644
--- a/src/Symfony/Component/Cache/Adapter/NullAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/NullAdapter.php
@@ -75,8 +75,10 @@ class NullAdapter implements AdapterInterface, CacheInterface
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
         return true;
     }
diff --git a/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php b/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
index bccafcf47e..24f13832cb 100644
--- a/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
@@ -147,9 +147,17 @@ class ProxyAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
+
+        if ($this->pool instanceof AdapterInterface) {
+            return $this->pool->clear($this->namespace.$prefix);
+        }
+
         return $this->pool->clear();
     }
 
diff --git a/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php b/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
index 5b08418fcc..02feca3f91 100644
--- a/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
@@ -213,10 +213,26 @@ class TagAwareAdapter implements TagAwareAdapterInterface, TagAwareCacheInterfac
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
-        $this->deferred = [];
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
+
+        if ('' !== $prefix) {
+            foreach ($this->deferred as $key => $item) {
+                if (0 === strpos($key, $prefix)) {
+                    unset($this->deferred[$key]);
+                }
+            }
+        } else {
+            $this->deferred = [];
+        }
+
+        if ($this->pool instanceof AdapterInterface) {
+            return $this->pool->clear($prefix);
+        }
 
         return $this->pool->clear();
     }
diff --git a/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php b/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php
index 660acf54d7..1fe830ff2f 100644
--- a/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/TraceableAdapter.php
@@ -167,11 +167,18 @@ class TraceableAdapter implements AdapterInterface, CacheInterface, PruneableInt
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
         $event = $this->start(__FUNCTION__);
         try {
+            if ($this->pool instanceof AdapterInterface) {
+                return $event->result = $this->pool->clear($prefix);
+            }
+
             return $event->result = $this->pool->clear();
         } finally {
             $event->end = microtime(true);
diff --git a/src/Symfony/Component/Cache/CHANGELOG.md b/src/Symfony/Component/Cache/CHANGELOG.md
index 1d24a97ed8..136953fe27 100644
--- a/src/Symfony/Component/Cache/CHANGELOG.md
+++ b/src/Symfony/Component/Cache/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * added support for connecting to Redis Sentinel clusters
+ * added argument `$prefix` to `AdapterInterface::clear()`
 
 4.3.0
 -----
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/AdapterTestCase.php b/src/Symfony/Component/Cache/Tests/Adapter/AdapterTestCase.php
index 93318ffd48..aa1a57318b 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/AdapterTestCase.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/AdapterTestCase.php
@@ -252,6 +252,26 @@ abstract class AdapterTestCase extends CachePoolTest
         $this->assertFalse($this->isPruned($cache, 'foo'));
         $this->assertTrue($this->isPruned($cache, 'qux'));
     }
+
+    public function testClearPrefix()
+    {
+        if (isset($this->skippedTests[__FUNCTION__])) {
+            $this->markTestSkipped($this->skippedTests[__FUNCTION__]);
+        }
+
+        $cache = $this->createCachePool(0, __FUNCTION__);
+        $cache->clear();
+
+        $item = $cache->getItem('foobar');
+        $cache->save($item->set(1));
+
+        $item = $cache->getItem('barfoo');
+        $cache->save($item->set(2));
+
+        $cache->clear('foo');
+        $this->assertFalse($cache->hasItem('foobar'));
+        $this->assertTrue($cache->hasItem('barfoo'));
+    }
 }
 
 class NotUnserializable
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/DoctrineAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/DoctrineAdapterTest.php
index 8f520cb59a..b5644cbc84 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/DoctrineAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/DoctrineAdapterTest.php
@@ -23,6 +23,7 @@ class DoctrineAdapterTest extends AdapterTestCase
         'testDeferredSaveWithoutCommit' => 'Assumes a shared cache which ArrayCache is not.',
         'testSaveWithoutExpire' => 'Assumes a shared cache which ArrayCache is not.',
         'testNotUnserializable' => 'ArrayCache does not use serialize/unserialize',
+        'testClearPrefix' => 'Doctrine cannot clear by prefix',
     ];
 
     public function createCachePool($defaultLifetime = 0)
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php
index 59f33f3aee..050f105bc9 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php
@@ -19,6 +19,7 @@ class MemcachedAdapterTest extends AdapterTestCase
     protected $skippedTests = [
         'testHasItemReturnsFalseWhenDeferredItemIsExpired' => 'Testing expiration slows down the test suite',
         'testDefaultLifeTime' => 'Testing expiration slows down the test suite',
+        'testClearPrefix' => 'Memcached cannot clear by prefix',
     ];
 
     protected static $client;
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
index 3a5904b107..b6adc3a44c 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
@@ -72,7 +72,7 @@ class PhpArrayAdapterTest extends AdapterTestCase
 
     public function createCachePool($defaultLifetime = 0, $testMethod = null)
     {
-        if ('testGetMetadata' === $testMethod) {
+        if ('testGetMetadata' === $testMethod || 'testClearPrefix' === $testMethod) {
             return new PhpArrayAdapter(self::$file, new FilesystemAdapter());
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php
index 09c55e60d0..1647a6d4cb 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php
@@ -23,6 +23,7 @@ class Psr16AdapterTest extends AdapterTestCase
 {
     protected $skippedTests = [
         'testPrune' => 'Psr16adapter just proxies',
+        'testClearPrefix' => 'SimpleCache cannot clear by prefix',
     ];
 
     public function createCachePool($defaultLifetime = 0)
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php
index 8097e49cfd..c4ec9bf62e 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/SimpleCacheAdapterTest.php
@@ -23,6 +23,7 @@ class SimpleCacheAdapterTest extends AdapterTestCase
 {
     protected $skippedTests = [
         'testPrune' => 'SimpleCache just proxies',
+        'testClearPrefix' => 'SimpleCache cannot clear by prefix',
     ];
 
     public function createCachePool($defaultLifetime = 0)
diff --git a/src/Symfony/Component/Cache/Traits/AbstractTrait.php b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
index 7c8ccabfb0..07205758a8 100644
--- a/src/Symfony/Component/Cache/Traits/AbstractTrait.php
+++ b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
@@ -102,9 +102,12 @@ trait AbstractTrait
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
         $this->deferred = [];
         if ($cleared = $this->versioningIsEnabled) {
             $namespaceVersion = substr_replace(base64_encode(pack('V', mt_rand())), static::NS_SEPARATOR, 5);
@@ -120,7 +123,7 @@ trait AbstractTrait
         }
 
         try {
-            return $this->doClear($this->namespace) || $cleared;
+            return $this->doClear($this->namespace.$prefix) || $cleared;
         } catch (\Exception $e) {
             CacheItem::log($this->logger, 'Failed to clear the cache: '.$e->getMessage(), ['exception' => $e]);
 
diff --git a/src/Symfony/Component/Cache/Traits/ArrayTrait.php b/src/Symfony/Component/Cache/Traits/ArrayTrait.php
index df7d238e2d..e1ce980bf5 100644
--- a/src/Symfony/Component/Cache/Traits/ArrayTrait.php
+++ b/src/Symfony/Component/Cache/Traits/ArrayTrait.php
@@ -66,10 +66,22 @@ trait ArrayTrait
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
-        $this->values = $this->expiries = [];
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
+
+        if ('' !== $prefix) {
+            foreach ($this->values as $key => $value) {
+                if (0 === strpos($key, $prefix)) {
+                    unset($this->values[$key], $this->expiries[$key]);
+                }
+            }
+        } else {
+            $this->values = $this->expiries = [];
+        }
 
         return true;
     }
diff --git a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
index 37e1fd1f06..97bc2600f1 100644
--- a/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
+++ b/src/Symfony/Component/Cache/Traits/FilesystemCommonTrait.php
@@ -56,6 +56,10 @@ trait FilesystemCommonTrait
         $ok = true;
 
         foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->directory, \FilesystemIterator::SKIP_DOTS)) as $file) {
+            if ('' !== $namespace && 0 !== strpos($this->getFileKey($file), $namespace)) {
+                continue;
+            }
+
             $ok = ($file->isDir() || $this->doUnlink($file) || !file_exists($file)) && $ok;
         }
 
@@ -114,6 +118,11 @@ trait FilesystemCommonTrait
         return $dir.substr($hash, 2, 20);
     }
 
+    private function getFileKey(string $file): string
+    {
+        return '';
+    }
+
     /**
      * @internal
      */
diff --git a/src/Symfony/Component/Cache/Traits/FilesystemTrait.php b/src/Symfony/Component/Cache/Traits/FilesystemTrait.php
index 9c444f9b04..31f0d74372 100644
--- a/src/Symfony/Component/Cache/Traits/FilesystemTrait.php
+++ b/src/Symfony/Component/Cache/Traits/FilesystemTrait.php
@@ -108,4 +108,17 @@ trait FilesystemTrait
 
         return $failed;
     }
+
+    private function getFileKey(string $file): string
+    {
+        if (!$h = @fopen($file, 'rb')) {
+            return '';
+        }
+
+        fgets($h); // expiry
+        $encodedKey = fgets($h);
+        fclose($h);
+
+        return rawurldecode(rtrim($encodedKey));
+    }
 }
diff --git a/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php b/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
index 4395de0252..6548ec115c 100644
--- a/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Cache\Traits;
 
+use Symfony\Component\Cache\Adapter\AdapterInterface;
 use Symfony\Component\Cache\CacheItem;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
 use Symfony\Component\VarExporter\VarExporter;
@@ -121,13 +122,20 @@ EOF;
 
     /**
      * {@inheritdoc}
+     *
+     * @param string $prefix
      */
-    public function clear()
+    public function clear(/*string $prefix = ''*/)
     {
+        $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : '';
         $this->keys = $this->values = [];
 
         $cleared = @unlink($this->file) || !file_exists($this->file);
 
+        if ($this->pool instanceof AdapterInterface) {
+            return $this->pool->clear($prefix) && $cleared;
+        }
+
         return $this->pool->clear() && $cleared;
     }
 
diff --git a/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php b/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
index 5ed4d6023e..d7125bec9e 100644
--- a/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
@@ -211,17 +211,19 @@ trait PhpFilesTrait
                 $value = var_export($value, true);
             }
 
+            $encodedKey = rawurlencode($key);
+
             if (!$isStaticValue) {
                 // We cannot use a closure here because of https://bugs.php.net/76982
                 $value = str_replace('\Symfony\Component\VarExporter\Internal\\', '', $value);
-                $value = "<?php\n\nnamespace Symfony\Component\VarExporter\Internal;\n\nreturn \$getExpiry ? {$expiry} : {$value};\n";
+                $value = "namespace Symfony\Component\VarExporter\Internal;\n\nreturn \$getExpiry ? {$expiry} : {$value};";
             } else {
-                $value = "<?php return [{$expiry}, {$value}];\n";
+                $value = "return [{$expiry}, {$value}];";
             }
 
             $file = $this->files[$key] = $this->getFile($key, true);
             // Since OPcache only compiles files older than the script execution start, set the file's mtime in the past
-            $ok = $this->write($file, $value, self::$startTime - 10) && $ok;
+            $ok = $this->write($file, "<?php //{$encodedKey}\n\n{$value}\n", self::$startTime - 10) && $ok;
 
             if ($allowCompile) {
                 @opcache_invalidate($file, true);
@@ -266,6 +268,18 @@ trait PhpFilesTrait
 
         return @unlink($file);
     }
+
+    private function getFileKey(string $file): string
+    {
+        if (!$h = @fopen($file, 'rb')) {
+            return '';
+        }
+
+        $encodedKey = substr(fgets($h), 8);
+        fclose($h);
+
+        return rawurldecode(rtrim($encodedKey));
+    }
 }
 
 /**