fix 'Array and string offset access using curly braces' deprecated error

Author: Steffen-MLR

libs/php_idn/idna.php

@@ -12,7 +12,7 @@ function ordUTF8($c, $index = 0, &$bytes = null)
     $bytes = 0;
     if ($index >= $len)
     return false;
-    $h = ord($c{$index});
+    $h = ord($c[$index]);
     if ($h <= 0x7F) {
     $bytes = 1;
     return $h;
@@ -21,18 +21,18 @@ function ordUTF8($c, $index = 0, &$bytes = null)
     return false;
     else if ($h <= 0xDF && $index < $len - 1) {
     $bytes = 2;
-    return ($h & 0x1F) << 6 | (ord($c{$index + 1}) & 0x3F);
+    return ($h & 0x1F) << 6 | (ord($c[$index + 1]) & 0x3F);
     }
     else if ($h <= 0xEF && $index < $len - 2) {
     $bytes = 3;
-    return ($h & 0x0F) << 12 | (ord($c{$index + 1}) & 0x3F) << 6
-    | (ord($c{$index + 2}) & 0x3F);
+    return ($h & 0x0F) << 12 | (ord($c[$index + 1]) & 0x3F) << 6
+    | (ord($c[$index + 2]) & 0x3F);
     }
     else if ($h <= 0xF4 && $index < $len - 3) {
     $bytes = 4;
-    return ($h & 0x0F) << 18 | (ord($c{$index + 1}) & 0x3F) << 12
-    | (ord($c{$index + 2}) & 0x3F) << 6
-    | (ord($c{$index + 3}) & 0x3F);
+    return ($h & 0x0F) << 18 | (ord($c[$index + 1]) & 0x3F) << 12
+    | (ord($c[$index + 2]) & 0x3F) << 6
+    | (ord($c[$index + 3]) & 0x3F);
     }
     else
     return false;