Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Utility/Environment.php

@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Utility\Environment.
+ */
+
+namespace Drupal\Component\Utility;
+
+/**
+ * Provides PHP environment helper methods.
+ */
+class Environment {
+
+  /**
+   * Compares the memory required for an operation to the available memory.
+   *
+   * @param string $required
+   *   The memory required for the operation, expressed as a number of bytes with
+   *   optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8bytes,
+   *   9mbytes).
+   * @param $memory_limit
+   *   (optional) The memory limit for the operation, expressed as a number of
+   *   bytes with optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G,
+   *   6GiB, 8bytes, 9mbytes). If no value is passed, the current PHP
+   *   memory_limit will be used. Defaults to NULL.
+   *
+   * @return bool
+   *   TRUE if there is sufficient memory to allow the operation, or FALSE
+   *   otherwise.
+   */
+  public static function checkMemoryLimit($required, $memory_limit = NULL) {
+    if (!isset($memory_limit)) {
+      $memory_limit = ini_get('memory_limit');
+    }
+
+    // There is sufficient memory if:
+    // - No memory limit is set.
+    // - The memory limit is set to unlimited (-1).
+    // - The memory limit is greater than or equal to the memory required for
+    //   the operation.
+    return ((!$memory_limit) || ($memory_limit == -1) || (Bytes::toInt($memory_limit) >= Bytes::toInt($required)));
+  }
+
+}