PHP Tools_help::getMemoryLimit示例

 /**
  * 检查内存占用
  * @param $image
  * @return bool
  */
 public static function checkImageMemoryLimit($image)
 {
     $infos = @getimagesize($image);
     $memory_limit = Tools_help::getMemoryLimit();
     if (function_exists('memory_get_usage') && (int) $memory_limit != -1) {
         $current_memory = memory_get_usage();
         $channel = isset($infos['channels']) ? $infos['channels'] / 8 : 1;
         if (($infos[0] * $infos[1] * $infos['bits'] * $channel + pow(2, 16)) * 1.8 + $current_memory > $memory_limit - 1024 * 1024) {
             return false;
         }
     }
     return true;
 }