Replace curly brace string offset with square bracket syntax (#222)

Co-authored-by: haszi <[email protected]>

Author: haszi

phpdotnet/phd/Package/PEAR/XHTML.php

@@ -643,7 +643,7 @@ public function format_phd_pearapi($open, $name, $attrs, $props)
             if (count($arLinkend) == 1) {
                 //link to class
                 $linktpl = '{$package}/docs/latest/{$package}/{$class}.html';
-            } else if ($arLinkend[1]{0} == '$') {
+            } else if ($arLinkend[1][0] == '$') {
                 //link to class variable
                 $variable = $arLinkend[1];
                 $linktpl = '{$package}/docs/latest/{$package}/{$class}.html#var{$variable}';