diff --git a/.github/actions/verify-directory-sizes/action.yml b/.github/actions/verify-directory-sizes/action.yml
new file mode 100644
index 0000000000000..4bc7de81d4fa4
--- /dev/null
+++ b/.github/actions/verify-directory-sizes/action.yml
@@ -0,0 +1,6 @@
+name: Verify directories are not too big
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: bash "${GITHUB_WORKSPACE}/.github/actions/verify-directory-sizes/script.sh"
diff --git a/.github/actions/verify-directory-sizes/script.sh b/.github/actions/verify-directory-sizes/script.sh
new file mode 100644
index 0000000000000..76b787fda78cd
--- /dev/null
+++ b/.github/actions/verify-directory-sizes/script.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+
+set -eu
+set +x
+
+# Bash script to check directory sizes, we want to keep each directory under
+# at most 1000 entries so that the GitHub online interface can be used to
+# browse without excluding files
+MAX_DIR_SIZE=0
+MAX_DIR_NAME=0
+
+# This is enforced limit
+DIR_SIZE_LIMIT=1000
+
+check_directory () {
+    local CURR_DIR=$1
+    local CURR_DIR_SIZE=$(ls -l $CURR_DIR | wc -l)
+    if [ "$CURR_DIR_SIZE" -gt "$DIR_SIZE_LIMIT" ]; then
+        # Show the same message but in red
+        echo -e "\033[0;31m$CURR_DIR has $CURR_DIR_SIZE entries\033[0m"
+    else
+        echo "$CURR_DIR has $CURR_DIR_SIZE entries"
+    fi
+    if [ "$CURR_DIR_SIZE" -gt "$MAX_DIR_SIZE" ]; then
+        MAX_DIR_SIZE=$CURR_DIR_SIZE
+        MAX_DIR_NAME=$CURR_DIR
+    fi
+
+    # Sending stderr to /dev/null is used to suppress errors about no such
+    # file or directory when a directory has no sub directories
+    local SUBDIRS=$(ls -d $CURR_DIR*/ 2>/dev/null)
+    for SUBDIR in $SUBDIRS
+    do
+        check_directory $SUBDIR
+    done
+}
+
+check_directory ./
+
+echo "Biggest directory: $MAX_DIR_NAME"
+echo "Size: $MAX_DIR_SIZE"
+
+if [ "$MAX_DIR_SIZE" -gt "$DIR_SIZE_LIMIT" ]; then
+    echo -e "\033[0;31mMaximum allowed size: $DIR_SIZE_LIMIT\033[0m"
+    # Action is unsuccessful
+    exit 1
+fi
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index b92a55b58b87d..262adb74f77af 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -136,6 +136,9 @@ jobs:
       - name: Verify generated files are up to date
         if: ${{ !matrix.asan }}
         uses: ./.github/actions/verify-generated-files
+      - name: Verify directories are not too big
+        if: ${{ !matrix.asan }}
+        uses: ./.github/actions/verify-directory-sizes
   LINUX_X32:
     if: github.repository == 'php/php-src' || github.event_name == 'pull_request'
     name: LINUX_X32_DEBUG_ZTS