PHPC-2343: Require PHP 8.1 (#1631)

* Remove PHP 8.0 and 7.4 from CI matrix

* Bump PHP requirement in config.m4

* Remove conditional dependencies in config.w32

* Bump minimum PHP version in package.xml

* Remove conditional macro definitions

* Remove conditional arginfo definitions

* Directly implement Stringable interface

* Remove conditional code

* Remove skipped tests and obsolete SKIPIF statements in tests

* Clarify removal requirement for return type checks

* Remove obsolete serialisation macro

* Remove unused macro for final classes

* Make enum code unconditional

Author: alcaeus

.evergreen/architecture.md

@@ -15,8 +15,7 @@ initialisation. If a build step fails, test tasks are skipped for that platform
 
 Build tasks are generated automatically and included in the main config file. The `build-variants.yml` file contains
 the list of supported platforms that the extension is built for. `build-task-groups.yml` defines the task groups that
-contain the build tasks. Note there is a separate task that skips PHP 7.4 and 8.0, as these versions do not support
-OpenSSL 3 (currently used on RHEL 9+ and Ubuntu 22.04+).
+contain the build tasks.
 
 ## Build Step 2: Run Tests
 

.evergreen/config.yml

@@ -74,6 +74,5 @@ include:
   - filename: .evergreen/config/generated/test/ocsp.yml
   - filename: .evergreen/config/generated/test/require-api-version.yml
   - filename: .evergreen/config/generated/test/skip-crypt-shared.yml
-  - filename: .evergreen/config/generated/test-variant/modern-php-full.yml
-  - filename: .evergreen/config/generated/test-variant/legacy-php-full.yml
+  - filename: .evergreen/config/generated/test-variant/php-full.yml
   - filename: .evergreen/config/generated/test-variant/libmongoc.yml

.evergreen/config/build-task-groups.yml

@@ -11,26 +11,14 @@ task_groups:
   # Builds all versions of PHP
   - name: "build-all-php"
     # Keep this number in sync with the number of PHP versions to allow for parallel builds
-    max_hosts: 4
+    max_hosts: 3
     setup_task: *build_setup
     setup_task_can_fail_task: true
     setup_task_timeout_secs: 1800
     teardown_task: *build_teardown
     tasks:
       - ".build"
 
-  # Builds all versions of PHP that support OpenSSL 3 (PHP 8.1+)
-  - name: "build-php-openssl3"
-    # Keep this number in sync with the number of PHP versions to allow for parallel builds
-    # Subtract 2 versions as PHP 7.4 and 8.0 are not built with OpenSSL 3
-    max_hosts: 2
-    setup_task: *build_setup
-    setup_task_can_fail_task: true
-    setup_task_timeout_secs: 1800
-    teardown_task: *build_teardown
-    tasks:
-      - ".build !.php7.4 !.php8.0"
-
   - name: "build-php-libmongoc"
     # Keep this in sync with the actual number of libmongoc builds (typically 3) defined in _template-build-libmongoc.yml
     max_hosts: 3

.evergreen/config/build-variants.yml

@@ -8,7 +8,7 @@ buildvariants:
     tags: ["build", "debian", "x64", "pr", "tag"]
     run_on: debian12-small
     tasks:
-      - name: "build-php-openssl3"
+      - name: "build-all-php"
       - name: "build-php-libmongoc"
   - name: build-debian11
     display_name: "Build: Debian 11"
@@ -35,7 +35,7 @@ buildvariants:
     tags: ["build", "rhel", "x64", "pr", "tag"]
     run_on: rhel90-small
     tasks:
-      - name: "build-php-openssl3"
+      - name: "build-all-php"
   - name: build-rhel83-zseries
     display_name: "Build: RHEL 8.3 Zseries"
     tags: ["build", "rhel", "zseries", "tag"]
@@ -73,13 +73,13 @@ buildvariants:
     tags: ["build", "ubuntu", "x64", "pr", "tag"]
     run_on: ubuntu2204-small
     tasks:
-      - name: "build-php-openssl3"
+      - name: "build-all-php"
   - name: build-ubuntu2204-arm64
     display_name: "Build: Ubuntu 22.04 ARM64"
     tags: ["build", "ubuntu", "arm64", "tag"]
     run_on: ubuntu2204-arm64-small
     tasks:
-      - name: "build-php-openssl3"
+      - name: "build-all-php"
   - name: build-ubuntu2004
     display_name: "Build: Ubuntu 20.04 x64"
     tags: ["build", "ubuntu", "x64", "tag"]

.evergreen/config/generate-config.php

@@ -2,16 +2,11 @@
 <?php
 
 // Supported PHP versions. Add new versions to the beginning of the list
-$modernPhpVersions = [
+$phpVersions = [
     '8.3',
     '8.2',
     '8.1',
 ];
-$legacyPhpVersions = [
-    '8.0',
-    '7.4',
-];
-$supportedPhpVersions = array_merge($modernPhpVersions, $legacyPhpVersions);
 
 // Supported MongoDB versions. Add new versions after "rapid"
 $supportedMongoDBVersions = [
@@ -26,7 +21,7 @@
     '4.0',
 ];
 
-$latestPhpVersion = max($supportedPhpVersions);
+$latestPhpVersion = max($phpVersions);
 
 // Only test the latest PHP version for libmongoc
 $libmongocBuildPhpVersions = [ $latestPhpVersion ];
@@ -57,7 +52,7 @@
 $allFiles = [];
 
 // Build tasks
-$allFiles[] = generateConfigs('tasks', 'build', 'phpVersion', 'build-php.yml', $supportedPhpVersions);
+$allFiles[] = generateConfigs('tasks', 'build', 'phpVersion', 'build-php.yml', $phpVersions);
 $allFiles[] = generateConfigs('tasks', 'build', 'phpVersion', 'build-libmongoc.yml', $libmongocBuildPhpVersions);
 
 // Test tasks
@@ -68,8 +63,7 @@
 $allFiles[] = generateConfigs('tasks', 'test', 'mongodbVersion', 'skip-crypt-shared.yml', $skipCryptSharedServerVersions);
 
 // Test variants
-$allFiles[] = generateConfigs('buildvariants', 'test-variant', 'phpVersion', 'modern-php-full.yml', $modernPhpVersions);
-$allFiles[] = generateConfigs('buildvariants', 'test-variant', 'phpVersion', 'legacy-php-full.yml', $legacyPhpVersions);
+$allFiles[] = generateConfigs('buildvariants', 'test-variant', 'phpVersion', 'php-full.yml', $phpVersions);
 $allFiles[] = generateConfigs('buildvariants', 'test-variant', 'phpVersion', 'libmongoc.yml', [$latestPhpVersion]);
 
 echo "Generated config. Use the following list to import files:\n";

.evergreen/config/generated/build/build-php.yml

@@ -17,18 +17,6 @@ outputs:
 runs:
   using: composite
   steps:
-    # Reinstall VC15 (Visual Studio 2017) for PHP 7.4 using a derivation of the
-    # script suggested in https://github.com/actions/runner-images/issues/9701
-    - name: Install VC15 component for PHP 7.4
-      if: ${{ inputs.version == '7.4' }}
-      shell: pwsh
-      run: |
-              Set-Location "C:\Program Files (x86)\Microsoft Visual Studio\Installer\"
-              $installPath = "C:\Program Files\Microsoft Visual Studio\2022\Enterprise"
-              $component = "Microsoft.VisualStudio.Component.VC.v141.x86.x64"
-              $args = ('/c', "vs_installer.exe", 'modify', '--installPath', "`"$installPath`"", '--add', $component, '--quiet', '--norestart', '--nocache')
-              $process = Start-Process -FilePath cmd.exe -ArgumentList $args -Wait -PassThru -WindowStyle Hidden
-
     - name: Setup PHP SDK
       id: setup-php
       uses: php/setup-php-sdk@v0.9

.evergreen/config/generated/test-variant/legacy-php-full.yml

@@ -13,7 +13,7 @@ on:
       - "feature/*"
 
 env:
-  PHP_VERSION: "7.4"
+  PHP_VERSION: "8.1"
 
 jobs:
   coding-standards:

.evergreen/config/generated/test-variant/modern-php-full.yml renamed to .evergreen/config/generated/test-variant/php-full.yml

@@ -98,6 +98,6 @@ jobs:
       fail-fast: false
       matrix:
         # Note: keep this in sync with the Windows matrix in tests.yml
-        php: [ "7.4", "8.0", "8.1", "8.2", "8.3", "8.4" ]
+        php: [ "8.1", "8.2", "8.3", "8.4" ]
         arch: [ x64, x86 ]
         ts: [ ts, nts ]