Support PHP 8

Author: clue

.github/workflows/ci.yml

@@ -14,6 +14,7 @@ jobs:
           - ubuntu-20.04
           - windows-2019
         php:
+          - 8.0
           - 7.4
           - 7.3
           - 7.2

README.md

@@ -573,7 +573,7 @@ $ composer require react/child-process:^0.6.1
 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 7+ and HHVM.
+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.
 
 See above note for limited [Windows Compatibility](#windows-compatibility).

tests/AbstractProcessTest.php

@@ -109,15 +109,15 @@ public function testStartWithExcessiveNumberOfFileDescriptorsWillThrow()
             $this->markTestSkipped('Not supported on legacy HHVM');
         }
 
-        $ulimit = exec('ulimit -n 2>&1');
+        $ulimit = (int) exec('ulimit -n 2>&1');
         if ($ulimit < 1) {
             $this->markTestSkipped('Unable to determine limit of open files (ulimit not available?)');
         }
 
         $loop = $this->createLoop();
 
         // create 70% (usually ~700) dummy file handles in this parent dummy
-        $limit = (int)($ulimit * 0.7);
+        $limit = (int) ($ulimit * 0.7);
         $fds = array();
         for ($i = 0; $i < $limit; ++$i) {
             $fds[$i] = fopen('/dev/null', 'r');