CI框架实现递归生成文件路径并重新生成图片功能

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');set_time_limit(0);class Img_build extends CI_Controller{  private static $img_path =  'upload_old/';  private static $new_path =  'upload/';  function __construct()  {      parent::__construct();  }  /**   * 获取需要读取的路径的信息   * $map = array (   *         '路径名' => array (文件1, 文件2, 文件3)   *     )   */  public function index()  {    $this->load->helper('directory');    //读取路径的信息    $map = directory_map(self::$img_path, FALSE, TRUE);    echo "<pre>";    print_r($map);    echo "</pre>";    if(!empty($map) && is_array($map))    {      $this->build_path($map);    }  }  /**   * 递归生成相应的路径   * @param array $map   */  private function build_path($map = array())  {     if(!file_exists(self::$new_path))    {      mkdir(self::$new_path, 0777);    }    foreach($map as $key => $val)    {      $old_img_path = self::$img_path;      $old_tmp_path = self::$img_path.$key.'/';      $new_img_path = self::$new_path;      $new_tmp_path = self::$new_path.$key.'/';      if(is_dir($old_tmp_path))      {        //echo $new_tmp_path;        if(!file_exists($new_tmp_path))        {          mkdir($new_tmp_path, 0777);        }        self::$img_path = $old_tmp_path;        self::$new_path = $new_tmp_path;        echo 'path:'.self::$img_path."<hr>";        $this->load->helper('directory');        $c_map = directory_map($old_tmp_path, FALSE, TRUE);//           echo "<pre>";//           print_r($c_map);//           echo "</pre>";        if(!empty($c_map) && is_array($c_map))        {          $this->build_path($c_map);        }      }      if(is_file(self::$img_path.$val))      {        echo 'file:'.self::$img_path.$val."<hr>";        $img = array();        $img['source_image'] = self::$img_path.$val;        $img['new_image']  = self::$new_path.$val;        $this->build_img($img);      }      self::$img_path = $old_img_path;      self::$new_path = $new_img_path;    }  }  /**   * 根据原图片生成新的图片   * @param array $img   * $img = array('source_image'=> '原图片的路径', 'new_image' => '新图片路径')   */  private function build_img($img = array())  {      if(!is_array($img) || empty($img))    {      return FALSE;    }    //设置图像生成参数    $config['image_library']  = 'gd2';  //设置图像库    $config['source_image']   = $img['source_image']; //设置原始图像的名字/路径    $config['create_thumb']   = FALSE;  //让图像处理函数产生一个预览图像    $config['maintain_ratio']  = TRUE; //指定是否在缩放或使用硬值的时候使图像保持原始的纵横比例    //$config['quality']     = 200;    $img_info = array();    $img_info = getimagesize($config['source_image']);//获取图片的尺寸    if(is_array($img_info) && !empty($img_info))    {      $config['width']      = $img_info[0];      $config['height']      = $img_info[1];    }    $config['new_image']    = $img['new_image']; //新图片路径    $this->load->library('image_lib', $config); //加载图片处理类    $this->image_lib->initialize($config); //调用    if ( ! $this->image_lib->resize())    {      echo $this->image_lib->display_errors();    }        $this->image_lib->clear(); //清除图片处理参数  }}?>