diff --git a/.cache/.gitkeep b/.cache/.gitkeep
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 95e2af01721d..a5b1e53f212d 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -48,6 +48,7 @@ jobs:
   # - Checks out the repository.
   # - Sets up PHP.
   # - Logs debug information.
+  # - Configures caching for PHPCS scans.
   # - Installs Composer dependencies (use cache if possible).
   # - Make Composer packages available globally.
   # - Logs PHP_CodeSniffer debug information.
@@ -75,6 +76,18 @@ jobs:
           php --version
           composer --version
 
+      # This date is used to ensure that the PHPCS cache is cleared at least once every week.
+      # http://man7.org/linux/man-pages/man1/date.1.html
+      - name: "Get last Monday's date"
+        id: get-date
+        run: echo "::set-output name=date::$(/bin/date -u --date='last Mon' "+%F")"
+
+      - name: Cache PHPCS scan cache
+        uses: actions/cache@26968a09c0ea4f3e233fdddbafd1166051a095f6 # v2.1.4
+        with:
+          path: .cache/phpcs.json
+          key: ${{ runner.os }}-date-${{ steps.get-date.outputs.date }}-phpcs-cache-${{ hashFiles('**/composer.json') }}
+
       - name: Install Composer dependencies
         uses: ramsey/composer-install@92a7904348d4ad30236f3611e33b7f0c6f9edd70 # v1.1.0
         with:
diff --git a/.github/workflows/php-compatibility.yml b/.github/workflows/php-compatibility.yml
index 82202829ef53..6848465b5028 100644
--- a/.github/workflows/php-compatibility.yml
+++ b/.github/workflows/php-compatibility.yml
@@ -20,7 +20,7 @@ on:
       - '**.php'
       # These files configure Composer. Changes could affect the outcome.
       - 'composer.*'
-      # This file configures PHP Compatibility scanning. Changes could affect the outcome.
+      # This file configures PHP compatibility scanning. Changes could affect the outcome.
       - 'phpcompat.xml.dist'
       # Changes to workflow files should always verify all workflows are successful.
       - '.github/workflows/*.yml'
@@ -42,7 +42,8 @@ jobs:
   # Performs the following steps:
   # - Checks out the repository.
   # - Sets up PHP.
-  # - Logs debug information about the runner container.
+  # - Logs debug information.
+  # - Configures caching for PHP compatibility scans.
   # - Installs Composer dependencies (use cache if possible).
   # - Make Composer packages available globally.
   # - Logs PHP_CodeSniffer debug information.
@@ -69,6 +70,18 @@ jobs:
           php --version
           composer --version
 
+      # This date is used to ensure that the PHP compatibility cache is cleared at least once every week.
+      # http://man7.org/linux/man-pages/man1/date.1.html
+      - name: "Get last Monday's date"
+        id: get-date
+        run: echo "::set-output name=date::$(/bin/date -u --date='last Mon' "+%F")"
+
+      - name: Cache PHP compatibility scan cache
+        uses: actions/cache@26968a09c0ea4f3e233fdddbafd1166051a095f6 # v2.1.4
+        with:
+          path: .cache/phpcompat.json
+          key: ${{ runner.os }}-date-${{ steps.get-date.outputs.date }}-phpcompat-cache-${{ hashFiles('**/composer.json') }}
+
       - name: Install Composer dependencies
         uses: ramsey/composer-install@92a7904348d4ad30236f3611e33b7f0c6f9edd70 # v1.1.0
         with:
diff --git a/.gitignore b/.gitignore
index ca946e1930c6..4fe178c594c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ wp-tests-config.php
 /phpunit.xml
 /.phpcs.xml
 /phpcs.xml
+.cache/*
 /tests/phpunit/data/plugins/wordpress-importer
 /tests/phpunit/data/.trac-ticket-cache*
 /tests/qunit/compiled.html
diff --git a/phpcompat.xml.dist b/phpcompat.xml.dist
index db47b0ea2654..fbc436cf0d29 100644
--- a/phpcompat.xml.dist
+++ b/phpcompat.xml.dist
@@ -11,7 +11,7 @@
 	<arg name="extensions" value="php"/>
 
 	<!-- Whenever possible, cache the scan results and re-use those for unchanged files on the next scan. -->
-	<arg name="cache"/>
+	<arg name="cache" value=".cache/phpcompat.json"/>
 
 	<!-- Set the memory limit to 256M.
 		 For most standard PHP configurations, this means the memory limit will temporarily be raised.
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index dedf053d632a..cff6b536f1be 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -6,7 +6,7 @@
 	<arg name="extensions" value="php"/>
 
 	<!-- Whenever possible, cache the scan results and re-use those for unchanged files on the next scan. -->
-	<arg name="cache"/>
+	<arg name="cache" value=".cache/phpcs.json"/>
 
 	<!-- Set the memory limit to 256M.
 		 For most standard PHP configurations, this means the memory limit will temporarily be raised.