Drop PHP 7.4 support

This is according to our formal, published, policy to only support
EOL PHP after 6 months.

See https://phpspreadsheet.readthedocs.io/en/latest/#php-version-support

Also share the exact same dev deps across all PHP version for GitHub
Actions so runs are faster, much most importantly they are stable and
predictable. And we decide manually when we want to migrate to PHPUnit
10.

Fixes PHPOffice#3634
Closes PHPOffice#3710

Author: PowerKiKi

.github/workflows/github-pages.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Setup PHP, with composer and extensions
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 7.4
+          php-version: 8.1
           coverage: none # remove xdebug
 
       - name: Build API documentation

.github/workflows/main.yml

@@ -8,7 +8,6 @@ jobs:
         experimental:
           - false
         php-version:
-          - '7.4'
           - '8.0'
           - '8.1'
           - '8.2'
@@ -43,32 +42,25 @@ jobs:
 
       - name: Delete composer lock file
         id: composer-lock
-        if: ${{ matrix.php-version == '8.1' || matrix.php-version == '8.2' || matrix.php-version == 'nightly' }}
+        if: ${{ matrix.php-version == 'nightly' }}
         run: |
           rm composer.lock
           echo "flags=--ignore-platform-reqs" >> $GITHUB_OUTPUT
 
       - name: Install dependencies
-        run: composer update --no-progress --prefer-dist --optimize-autoloader ${{ steps.composer-lock.outputs.flags }}
+        run: composer install --no-progress --prefer-dist --optimize-autoloader ${{ steps.composer-lock.outputs.flags }}
 
       - name: Setup problem matchers for PHP
         run: echo "::add-matcher::${{ runner.tool_cache }}/php.json"
 
       - name: Setup problem matchers for PHPUnit
         run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
-      - name: "Run PHPUnit tests 1 (Experimental: ${{ matrix.experimental }})"
+      - name: "Run PHPUnit tests (Experimental: ${{ matrix.experimental }})"
         env:
           FAILURE_ACTION: "${{ matrix.experimental == true }}"
-        if: ${{ matrix.php-version == '7.4' || matrix.php-version == '8.0' }}
         run: vendor/bin/phpunit --verbose || $FAILURE_ACTION
 
-      - name: "Run PHPUnit tests 2 (Experimental: ${{ matrix.experimental }})"
-        env:
-          FAILURE_ACTION: "${{ matrix.experimental == true }}"
-        if: ${{ matrix.php-version == '8.1' || matrix.php-version == '8.2' || matrix.php-version == 'nightly' }}
-        run: vendor/bin/phpunit -c phpunit10.xml.dist --display-incomplete --display-skipped --display-deprecations --display-errors --display-notices --display-warnings || $FAILURE_ACTION
-
   php-cs-fixer:
     runs-on: ubuntu-latest
     steps:
@@ -160,7 +152,7 @@ jobs:
         run: composer install --no-progress --prefer-dist --optimize-autoloader
 
       - name: Code Version Compatibility check with PHP_CodeSniffer
-        run: ./vendor/bin/phpcs -q --report-width=200 --report=summary,full src/ --standard=PHPCompatibility --runtime-set testVersion 7.4-
+        run: ./vendor/bin/phpcs -q --report-width=200 --report=summary,full src/ --standard=PHPCompatibility --runtime-set testVersion 8.0-
 
   phpstan:
     runs-on: ubuntu-latest

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Changed
 
+- Drop support for PHP 7.4, according to https://phpspreadsheet.readthedocs.io/en/latest/#php-version-support [PR #3713](https://github.com/PHPOffice/PhpSpreadsheet/pull/3713)
 - RLM Added to NumberFormatter Currency. This happens depending on release of ICU which Php is using (it does not yet happen with any official release). PhpSpreadsheet will continue to use the value returned by Php, but a method is added to keep the result unchanged from release to release. [Issue #3571](https://github.com/PHPOffice/PhpSpreadsheet/issues/3571) [PR #3640](https://github.com/PHPOffice/PhpSpreadsheet/pull/3640)
 
 ### Deprecated

CONTRIBUTING.md

@@ -4,7 +4,7 @@ If you would like to contribute, here are some notes and guidelines:
 
  - All new development should be on feature/fix branches, which are then merged to the `master` branch once stable and approved; so the `master` branch is always the most up-to-date, working code
  - If you are going to submit a pull request, please fork from `master`, and submit your pull request back as a fix/feature branch referencing the GitHub issue number
- - The code must work with all PHP versions that we support (currently PHP 7.4 to PHP 8.2).
+ - The code must work with all PHP versions that we support.
    - You can call `composer versions` to test version compatibility. 
  - Code style should be maintained.
    - `composer style` will identify any issues with Coding Style`.

README.md

@@ -16,7 +16,7 @@ allow you to read and write various spreadsheet file formats such as Excel and L
 LTS: Support for PHP versions will only be maintained for a period of six months beyond the
 [end of life](https://www.php.net/supported-versions) of that PHP version.
 
-Currently the required PHP minimum version is PHP __7.4__, and we [will support that version](https://www.php.net/eol.php) until 28th June 2023.
+Currently the required PHP minimum version is PHP __8.0__, and we [will support that version](https://www.php.net/eol.php) until May 2024.
 
 See the `composer.json` for other requirements.
 
@@ -36,7 +36,7 @@ If you are building your installation on a development machine that is on a diff
     },
     "config": {
         "platform": {
-            "php": "7.4"
+            "php": "8.0"
         }
     }
 }

composer.json

@@ -43,7 +43,7 @@
     "scripts": {
         "check": [
             "phpcs src/ tests/ --report=checkstyle",
-            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 7.4- -n",
+            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 8.0- -n",
             "php-cs-fixer fix --ansi --dry-run --diff",
             "phpunit --color=always",
             "phpstan analyse --ansi --memory-limit=2048M"
@@ -57,11 +57,11 @@
             "php-cs-fixer fix"
         ],
         "versions": [
-            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 7.4- -n"
+            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 8.0- -n"
         ]
     },
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.0",
         "ext-ctype": "*",
         "ext-dom": "*",
         "ext-fileinfo": "*",
@@ -85,14 +85,14 @@
     },
     "require-dev": {
         "dealerdirect/phpcodesniffer-composer-installer": "dev-main",
-        "dompdf/dompdf": "^1.0 || ^2.0",
+        "dompdf/dompdf": "^2.0",
         "friendsofphp/php-cs-fixer": "^3.2",
         "mitoteam/jpgraph": "^10.3",
         "mpdf/mpdf": "^8.1.1",
         "phpcompatibility/php-compatibility": "^9.3",
         "phpstan/phpstan": "^1.1",
         "phpstan/phpstan-phpunit": "^1.0",
-        "phpunit/phpunit": "^8.5 || ^9.0 || ^10.0",
+        "phpunit/phpunit": "^9.6",
         "squizlabs/php_codesniffer": "^3.7",
         "tecnickcom/tcpdf": "^6.5"
     },