[CMS-449] Error message and halt on PHP <5.5 or >=8.0 (#2269)

Author: namespacebrian

bin/terminus

@@ -9,6 +9,20 @@
  *   - Exits with a status code
  */
 
+// Version compatibility check and messaging
+if (version_compare(PHP_VERSION, '5.5.0', '<') === true) {
+    echo "\n";
+    echo 'Sorry, your PHP version (' . PHP_VERSION . ') is no longer supported.' . "\n";
+    echo 'Upgrade to PHP 5.5 or newer to use Terminus'; echo "\n\n";
+    exit(1);
+} elseif (version_compare(PHP_VERSION, '8.0', '>=') === true) {
+    echo "\n";
+    echo 'PHP 8.0+ is not supported by this version of Terminus.' . "\n";
+    echo 'Upgrade to Terminus 3 for PHP 8+ support.' . "\n";
+    echo "\n";
+    exit(1);
+}
+
 $pharPath = \Phar::running(true);
 if ($pharPath) {
     include_once("$pharPath/vendor/autoload.php");