Nomad changes

docs/snippets/php/installation/requirements_check.php

@@ -0,0 +1,81 @@
+```php title="requirements_check.php"
+<?php
+
+declare(strict_types=1);
+
+/**
+ * System Requirements Check
+ *
+ * Verify that your system meets all requirements for running Kreuzberg.
+ */
+
+echo "Kreuzberg System Requirements Check\n";
+echo "====================================\n\n";
+
+$requirements_met = true;
+
+echo "PHP Version: " . PHP_VERSION;
+if (version_compare(PHP_VERSION, '8.1.0', '>=')) {
+    echo " ✓ (>= 8.1.0 required)\n";
+} else {
+    echo " ✗ (>= 8.1.0 required)\n";
+    $requirements_met = false;
+}
+
+$required_extensions = ['json', 'mbstring'];
+foreach ($required_extensions as $ext) {
+    echo "Extension '$ext': ";
+    if (extension_loaded($ext)) {
+        echo "✓ Loaded\n";
+    } else {
+        echo "✗ Missing\n";
+        $requirements_met = false;
+    }
+}
+
+echo "Extension 'kreuzberg': ";
+if (extension_loaded('kreuzberg')) {
+    echo "✓ Loaded\n";
+} else {
+    echo "✗ Missing\n";
+    $requirements_met = false;
+}
+
+$memory_limit = ini_get('memory_limit');
+echo "\nMemory Limit: $memory_limit";
+$memory_bytes = return_bytes($memory_limit);
+if ($memory_bytes >= 128 * 1024 * 1024) {
+    echo " ✓ (>= 128M recommended)\n";
+} else {
+    echo " ! (>= 128M recommended for large documents)\n";
+}
+
+echo "\n";
+if ($requirements_met) {
+    echo "✓ All requirements met! You're ready to use Kreuzberg.\n";
+} else {
+    echo "✗ Some requirements are not met. Please install missing components.\n";
+    exit(1);
+}
+
+/**
+ * Convert PHP memory limit notation to bytes
+ */
+function return_bytes(string $val): int
+{
+    $val = trim($val);
+    $last = strtolower($val[strlen($val) - 1]);
+    $val = (int) $val;
+
+    switch ($last) {
+        case 'g':
+            $val *= 1024;
+        case 'm':
+            $val *= 1024;
+        case 'k':
+            $val *= 1024;
+    }
+
+    return $val;
+}
+```