Add asan usage

README.md

@@ -41,6 +41,7 @@ Setup PHP with required extensions, php.ini configuration, code-coverage support
   - [Nightly Build Setup](#nightly-build-setup)
   - [Debug Build Setup](#debug-build-setup)
   - [Thread Safe Setup](#thread-safe-setup)
+  - [ASAN Build Setup](#asan-build-setup)
   - [Force Update Setup](#force-update-setup)
   - [Verbose Setup](#verbose-setup)
   - [Multi-Arch Setup](#multi-arch-setup)
@@ -463,6 +464,13 @@ Disable coverage for these reasons:
 - Accepts a `string` in csv-format. For example: `phpunit, phpcs`
 - See [tools support](#wrench-tools-support) for tools supported.
 
+#### `asan` (optional)
+
+- Specify to set up PHP with AddressSanitizer (ASAN) for memory error detection.
+- Accepts `true` or `false`.
+- Only available for PHP 8.0 and above on Linux runners.
+- See [ASAN build setup](#asan-build-setup) for more info.
+
 #### `github-token` (optional)
 
 - Specify the GitHub token to use for authentication.
@@ -621,6 +629,43 @@ jobs:
         phpts: ts # specify ts or nts
 ```
 
+### ASAN Build Setup
+
+> Set up PHP with AddressSanitizer (ASAN) for memory error detection.
+
+- ASAN builds include both AddressSanitizer and UndefinedBehaviorSanitizer (UBSan).
+- Only available for PHP 8.0 and above on Linux runners.
+- Useful for detecting memory errors such as buffer overflows, use-after-free, and memory leaks.
+
+```yaml
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    name: Setup PHP with ASAN
+    steps:
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: '8.5'
+        asan: true
+```
+
+You can combine ASAN with other options:
+
+```yaml
+- name: Setup PHP with ASAN and thread safety
+  uses: shivammathur/setup-php@v2
+  with:
+    php-version: '8.5'
+    asan: true
+  env:
+    phpts: ts
+```
+
+> [!NOTE]
+> - ASAN builds have a performance overhead due to the instrumentation, so they are recommended for testing and debugging only.
+> - You can configure ASAN behavior using the `ASAN_OPTIONS` environment variable in your test steps.
+
 ### Force Update Setup
 
 > Update to the latest patch of PHP versions.

action.yml

@@ -27,6 +27,9 @@ inputs:
   tools:
     description: 'Setup popular tools globally.'
     required: false
+  asan:
+    description: 'Setup PHP with Address Sanitizer (ASAN). PHP 8.0+ on Linux only.'
+    required: false
   github-token:
     description: 'GitHub token to use for authentication.'
     default: ${{ github.token }}

src/install.ts

@@ -53,6 +53,7 @@ export async function getScript(os: string): Promise<string> {
 export async function setEnv(): Promise<void> {
   process.env['fail_fast'] = await utils.getInput('fail-fast', false);
   process.env['GITHUB_TOKEN'] ??= await utils.getInput('github-token', false);
+  process.env['ASAN'] = await utils.getInput('asan', false);
 }
 
 /**

src/scripts/linux.sh

@@ -114,7 +114,7 @@ add_devtools() {
 
 # Function to setup PHP from the shivammathur/php-builder builds.
 setup_php_builder() {
-  run_script "php-builder" "${runner:?}" "$version" "${debug:?}" "${ts:?}"
+  run_script "php-builder" "${runner:?}" "$version" "${debug:?}" "${ts:?}" "${asan:-}"
 }
 
 # Function to setup PHP 5.3, PHP 5.4 and PHP 5.5.
@@ -186,7 +186,15 @@ update_php() {
 
 # Function to install PHP.
 add_php() {
-  if [ "${runner:?}" = "self-hosted" ] || [ "${use_package_cache:-true}" = "false" ]; then
+  # ASAN is only supported for PHP 8.0+
+  if [[ -n "${asan:-}" && ! "$version" =~ ^8\. ]]; then
+    add_log "${cross:?}" "PHP" "ASAN is only supported for PHP 8.0+"
+    exit 1
+  fi
+  # ASAN builds are only available from php-builder
+  if [[ -n "${asan:-}" ]]; then
+    setup_php_builder
+  elif [ "${runner:?}" = "self-hosted" ] || [ "${use_package_cache:-true}" = "false" ]; then
     if [[ "$version" =~ ${php_builder_versions:?} || "$ts" = "zts" ]]; then
         setup_php_builder
     else

src/scripts/unix.sh

@@ -52,6 +52,7 @@ read_env() {
   update="${update:-${UPDATE:-false}}"
   [ "${debug:-${DEBUG:-false}}" = "true" ] && debug=debug && update=true || debug=release
   [[ "${phpts:-${PHPTS:-nts}}" = "ts" || "${phpts:-${PHPTS:-nts}}" = "zts" ]] && ts=zts && update=true || ts=nts
+  [[ "${asan:-${ASAN:-false}}" = "true" ]] && asan=asan && update=true || asan=
   fail_fast="${fail_fast:-${FAIL_FAST:-false}}"
   [[ ( -z "$ImageOS" && -z "$ImageVersion" ) ||
      ( -n "$RUNNER_ENVIRONMENT" && "$RUNNER_ENVIRONMENT" = "self-hosted" ) ||
@@ -78,6 +79,7 @@ read_env() {
   export runner
   export update
   export ts
+  export asan
   export tool_path_dir
 }