diff --git a/composer.json b/composer.json
index 9c85ceb1d5..6f0b526f7f 100644
--- a/composer.json
+++ b/composer.json
@@ -44,7 +44,8 @@
       "*": "dist"
     },
     "sort-packages": true,
-    "classmap-authoritative": true
+    "classmap-authoritative": true,
+    "platform-check": true
   },
   "autoload": {
     "classmap": [
diff --git a/lib/composer/platform_check.php b/lib/composer/platform_check.php
new file mode 100644
index 0000000000..861c725e0a
--- /dev/null
+++ b/lib/composer/platform_check.php
@@ -0,0 +1,42 @@
+<?php
+
+// platform_check.php @generated by Composer
+
+$issues = array();
+
+if (!(PHP_VERSION_ID >= 70103)) {
+    $issues[] = 'Your Composer dependencies require a PHP version ">= 7.1.3". You are running ' . PHP_VERSION . '.';
+}
+
+$missingExtensions = array();
+extension_loaded('ctype') || $missingExtensions[] = 'ctype';
+extension_loaded('dom') || $missingExtensions[] = 'dom';
+extension_loaded('gd') || $missingExtensions[] = 'gd';
+extension_loaded('iconv') || $missingExtensions[] = 'iconv';
+extension_loaded('json') || $missingExtensions[] = 'json';
+extension_loaded('libxml') || $missingExtensions[] = 'libxml';
+extension_loaded('mysqli') || $missingExtensions[] = 'mysqli';
+extension_loaded('soap') || $missingExtensions[] = 'soap';
+extension_loaded('tokenizer') || $missingExtensions[] = 'tokenizer';
+extension_loaded('xml') || $missingExtensions[] = 'xml';
+
+if ($missingExtensions) {
+    $issues[] = 'Your Composer dependencies require the following PHP extensions to be installed: ' . implode(', ', $missingExtensions) . '.';
+}
+
+if ($issues) {
+    if (!headers_sent()) {
+        header('HTTP/1.1 500 Internal Server Error');
+    }
+    if (!ini_get('display_errors')) {
+        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
+            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);
+        } elseif (!headers_sent()) {
+            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;
+        }
+    }
+    trigger_error(
+        'Composer detected issues in your platform: ' . implode(' ', $issues),
+        E_USER_ERROR
+    );
+}