Guard getIgnoreCase against array and object keys.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: csev

lib/src/Util/U.php

@@ -95,6 +95,7 @@ public static function get($arr, $key, $default=null) {
     public static function getIgnoreCase($arr, $key, $default=null) {
         if ( !is_array($arr) ) return $default;
         if ( !isset($key) ) return $default;
+        if ( is_array($key) || is_object($key) ) return $default;
         if ( isset($arr[$key]) ) return $arr[$key];
         $keyLower = strtolower((string)$key);
         foreach ($arr as $k => $v) {

lib/tests/Util/UTest.php

@@ -404,6 +404,8 @@ public function testGetIgnoreCase() {
         $this->assertEquals('missing', U::getIgnoreCase($headers, 'X-Not-There', 'missing'));
         $this->assertEquals('missing', U::getIgnoreCase(null, 'Link', 'missing'));
         $this->assertEquals('missing', U::getIgnoreCase($headers, null, 'missing'));
+        $this->assertEquals('missing', U::getIgnoreCase($headers, array('Link'), 'missing'));
+        $this->assertEquals('missing', U::getIgnoreCase($headers, new \stdClass(), 'missing'));
 
         $both = array('Link' => 'canonical', 'link' => 'lowercase');
         $this->assertEquals('canonical', U::getIgnoreCase($both, 'Link'));