bug #5466 Fix runtime check of PHP version (keradus)

This PR was merged into the 2.18 branch.

Discussion
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Fix runtime check of PHP version

closes #5465

Commits
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37a9611 Fix runtime check of PHP version

php-cs-fixer

@@ -23,7 +23,12 @@ if (defined('HHVM_VERSION_ID')) {
     } else {
         exit(1);
     }
-} elseif (!defined('PHP_VERSION_ID') || \PHP_VERSION_ID < 50600 || \PHP_VERSION_ID >= 80100) {
+} elseif (
+    !defined('PHP_VERSION_ID')
+    || \PHP_VERSION_ID === 80000
+    || \PHP_VERSION_ID < 50600
+    || \PHP_VERSION_ID >= 80100
+) {
     fwrite(STDERR, "PHP needs to be a minimum version of PHP 5.6.0 and maximum version of PHP 8.0.*.\n");
     fwrite(STDERR, 'Current PHP version: '.PHP_VERSION.".\n");