MINOR: Add workaround for hitting XDebugs fairly conservative nesting…

… level limit

core/Core.php

@@ -195,6 +195,11 @@ function array_fill_keys($keys,$value) {
  */
 increase_memory_limit_to('64M');
 
+/**
+ * Ensure we don't run into xdebug's fairly conservative infinite recursion protection limit
+ */
+increase_xdebug_nesting_level_to(200);
+
 /**
  * Set default encoding
  */
@@ -433,6 +438,19 @@ function get_increase_memory_limit_max() {
 	return $_increase_memory_limit_max;
 }
 
+/**
+ * Increases the XDebug parameter max_nesting_level, which limits how deep recursion can go.
+ * Only does anything if (a) xdebug is installed and (b) the new limit is higher than the existing limit
+ *
+ * @param int $limit - The new limit to increase to
+ */
+function increase_xdebug_nesting_level_to($limit) {
+	if (function_exists('xdebug_enable')) {
+		$current = ini_get('xdebug.max_nesting_level');
+		if ((int)$current < $limit) ini_set('xdebug.max_nesting_level', $limit);
+	}
+}
+
 /**
  * Turn a memory string, such as 512M into an actual number of bytes.
  *