diff --git a/CI/linters/phpcs.yml b/CI/linters/phpcs.yml
new file mode 100644
index 0000000..fcbb574
--- /dev/null
+++ b/CI/linters/phpcs.yml
@@ -0,0 +1,49 @@
+phpcs:
+  runs-on: ubuntu-latest
+  steps:
+    - uses: actions/checkout@v4
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: "8.2"
+
+    - name: Cache Composer
+      uses: actions/cache@v4
+      with:
+        path: vendor
+        key: composer-${{ hashFiles('composer.lock') }}
+        restore-keys: composer-
+
+    - name: Install dependencies
+      run: composer install --no-interaction --prefer-dist
+
+    - name: Run phpcs
+      run: |
+        set -euo pipefail
+
+        CONFIG_FOUND=0
+        for cfg in phpcs.xml phpcs.xml.dist .phpcs.xml .phpcs.xml.dist; do
+          if [[ -f "$cfg" ]]; then
+            CONFIG_FOUND=1
+            break
+          fi
+        done
+
+        if [[ $CONFIG_FOUND -eq 0 ]]; then
+          echo "::error::No phpcs ruleset found (expected phpcs.xml, phpcs.xml.dist, .phpcs.xml, or .phpcs.xml.dist)"
+          exit 1
+        fi
+
+        if [[ -x "vendor/bin/phpcs" ]]; then
+          PHPCS="vendor/bin/phpcs"
+        else
+          PHPCS="phpcs"
+        fi
+
+        if "$PHPCS"; then
+          echo "✅ phpcs passed"
+        else
+          echo "❌ phpcs found issues"
+          exit 1
+        fi
diff --git a/README.md b/README.md
index 2d2ca2d..dc435cf 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ that projects compose into their own workflows.
 | ktlint | linters | [CI/linters/ktlint.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/ktlint.yml) |
 | markdownlint | linters | [CI/linters/markdownlint.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/markdownlint.yml) |
 | mermaid-cli | linters | [CI/linters/mermaid.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/mermaid.yml) |
+| phpcs | linters | [CI/linters/phpcs.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/phpcs.yml) |
 | RuboCop | linters | [CI/linters/rubocop.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/rubocop.yml) |
 | Ruff | linters | [CI/linters/ruff.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/ruff.yml) |
 | ShellCheck | linters | [CI/linters/shellcheck.yml](https://github.com/prog-time/workflows/blob/main/CI/linters/shellcheck.yml) |
@@ -77,6 +78,7 @@ Workflows/
 │   │   │   ├── ktlint.yml
 │   │   │   ├── markdownlint.yml
 │   │   │   ├── mermaid.yml
+│   │   │   ├── phpcs.yml
 │   │   │   ├── rubocop.yml
 │   │   │   ├── ruff.yml
 │   │   │   ├── shellcheck.yml
@@ -107,6 +109,7 @@ Workflows/
 │       │   ├── ktlint.sh
 │       │   ├── markdownlint.sh
 │       │   ├── mermaid.sh
+│       │   ├── phpcs.sh
 │       │   ├── rubocop.sh
 │       │   ├── ruff.sh
 │       │   ├── shellcheck.sh
@@ -131,6 +134,7 @@ Workflows/
 │   │   ├── hadolint.bats
 │   │   ├── htmlhint.bats
 │   │   ├── markdownlint.bats
+│   │   ├── phpcs.bats
 │   │   ├── shellcheck.bats
 │   │   ├── stylelint.bats
 │   │   └── yamllint.bats
@@ -226,6 +230,7 @@ shellcheck:
 | `CI/linters/ktlint.yml` | [ktlint](https://pinterest.github.io/ktlint) | Kotlin |
 | `CI/linters/markdownlint.yml` | [markdownlint](https://github.com/DavidAnson/markdownlint) | Markdown files |
 | `CI/linters/mermaid.yml` | [mermaid-cli](https://github.com/mermaid-js/mermaid-cli) | Mermaid diagrams |
+| `CI/linters/phpcs.yml` | [phpcs](https://github.com/PHPCSStandards/PHP_CodeSniffer) | PHP (PSR-12 and custom rulesets) |
 | `CI/linters/rubocop.yml` | [rubocop](https://rubocop.org) | Ruby |
 | `CI/linters/ruff.yml` | [ruff](https://docs.astral.sh/ruff) | Python |
 | `CI/linters/shellcheck.yml` | [shellcheck](https://www.shellcheck.net) | Shell scripts |
diff --git a/scripts/CI/linters/phpcs.yml b/scripts/CI/linters/phpcs.yml
new file mode 100644
index 0000000..1fbd489
--- /dev/null
+++ b/scripts/CI/linters/phpcs.yml
@@ -0,0 +1,22 @@
+phpcs:
+  runs-on: ubuntu-latest
+  steps:
+    - uses: actions/checkout@v4
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: "8.2"
+
+    - name: Cache Composer
+      uses: actions/cache@v4
+      with:
+        path: vendor
+        key: composer-${{ hashFiles('composer.lock') }}
+        restore-keys: composer-
+
+    - name: Install dependencies
+      run: composer install --no-interaction --prefer-dist
+
+    - name: Run phpcs
+      run: bash scripts/shell/linters/phpcs.sh
diff --git a/scripts/shell/linters/phpcs.sh b/scripts/shell/linters/phpcs.sh
new file mode 100644
index 0000000..3b1b4ff
--- /dev/null
+++ b/scripts/shell/linters/phpcs.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CONFIG_FOUND=0
+for cfg in phpcs.xml phpcs.xml.dist .phpcs.xml .phpcs.xml.dist; do
+  if [[ -f "$cfg" ]]; then
+    CONFIG_FOUND=1
+    break
+  fi
+done
+
+if [[ $CONFIG_FOUND -eq 0 ]]; then
+  echo "::error::No phpcs ruleset found (expected phpcs.xml, phpcs.xml.dist, .phpcs.xml, or .phpcs.xml.dist)"
+  exit 1
+fi
+
+if [[ -x "vendor/bin/phpcs" ]]; then
+  PHPCS="vendor/bin/phpcs"
+else
+  PHPCS="phpcs"
+fi
+
+if "$PHPCS"; then
+  echo "✅ phpcs passed"
+else
+  echo "❌ phpcs found issues"
+  exit 1
+fi
diff --git a/tests/linters/phpcs.bats b/tests/linters/phpcs.bats
new file mode 100644
index 0000000..6fd731c
--- /dev/null
+++ b/tests/linters/phpcs.bats
@@ -0,0 +1,47 @@
+#!/usr/bin/env bats
+
+load "../helpers/common"
+
+SCRIPT="$BATS_TEST_DIRNAME/../../scripts/shell/linters/phpcs.sh"
+
+setup() {
+  setup_test_dir
+  mkdir -p "$TEST_DIR/bin"
+  export PATH="$TEST_DIR/bin:$PATH"
+}
+
+teardown() {
+  teardown_test_dir
+}
+
+make_phpcs_stub() {
+  local exit_code="$1"
+  cat > "$TEST_DIR/bin/phpcs" <<EOF
+#!/usr/bin/env bash
+exit $exit_code
+EOF
+  chmod +x "$TEST_DIR/bin/phpcs"
+}
+
+@test "no ruleset found: exits 1 with error annotation" {
+  make_phpcs_stub 0
+  run bash "$SCRIPT"
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"::error::No phpcs ruleset found"* ]]
+}
+
+@test "phpcs.xml present, phpcs passes: exits 0 with success message" {
+  make_phpcs_stub 0
+  touch phpcs.xml
+  run bash "$SCRIPT"
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"✅ phpcs passed"* ]]
+}
+
+@test "phpcs.xml present, phpcs reports violations: exits 1 with failure message" {
+  make_phpcs_stub 1
+  touch phpcs.xml
+  run bash "$SCRIPT"
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"❌ phpcs found issues"* ]]
+}