Update to require PHP 7.1+

.github/workflows/ci.yml

@@ -19,11 +19,6 @@ jobs:
           - 7.3
           - 7.2
           - 7.1
-          - 7.0
-          - 5.6
-          - 5.5
-          - 5.4
-          - 5.3
     steps:
       - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
@@ -52,23 +47,3 @@ jobs:
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
       - run: time php examples/91-benchmark-throughput.php
-
-  PHPUnit-hhvm:
-    name: PHPUnit (HHVM)
-    runs-on: ubuntu-22.04
-    continue-on-error: true
-    steps:
-      - uses: actions/checkout@v4
-      - run: cp "$(which composer)" composer.phar && ./composer.phar self-update --2.2 # downgrade Composer for HHVM
-      - name: Run hhvm composer.phar install
-        uses: docker://hhvm/hhvm:3.30-lts-latest
-        with:
-          args: hhvm composer.phar install
-      - name: Run hhvm vendor/bin/phpunit
-        uses: docker://hhvm/hhvm:3.30-lts-latest
-        with:
-          args: hhvm vendor/bin/phpunit
-      - name: Run time hhvm examples/91-benchmark-throughput.php
-        uses: docker://hhvm/hhvm:3.30-lts-latest
-        with:
-          args: bash -c "time hhvm examples/91-benchmark-throughput.php"

README.md

@@ -1217,9 +1217,8 @@ composer require react/stream:^3@dev
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
 
 This project aims to run on any platform and thus does not require any PHP
-extensions and supports running on legacy PHP 5.3 through current PHP 8+ and HHVM.
-It's *highly recommended to use PHP 7+* for this project due to its vast
-performance improvements.
+extensions and supports running on PHP 7.1 through current PHP 8+.
+It's *highly recommended to use the latest supported PHP version* for this project.
 
 ## Tests
 

composer.json

@@ -26,12 +26,12 @@
         }
     ],
     "require": {
-        "php": ">=5.3.8",
+        "php": ">=7.1",
         "react/event-loop": "^1.2",
         "evenement/evenement": "^3.0 || ^2.0 || ^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6 || ^5.7 || ^4.8.36",
+        "phpunit/phpunit": "^9.6 || ^5.7",
         "clue/stream-filter": "~1.2"
     },
     "autoload": {

phpunit.xml.legacy

@@ -2,7 +2,7 @@
 
 <!-- PHPUnit configuration file with old format for legacy PHPUnit -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/4.8/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/5.7/phpunit.xsd"
          bootstrap="vendor/autoload.php"
          colors="true">
     <testsuites>