1<?php
 2$path = './';
 3//打开文件夹
 4$dir_handle = opendir($path);
 5//读取文件夹
 6while(false !== $file = readdir($dir_handle)){
 7  if ($file == '.' || $file == '..') continue;
 8  echo $file, '<br>';
 9}
10//关闭文件夹
11closedir($dir_handle);

 1<?php
 2$path = './';
 3
 4function read_dirs_tree($path, $deep=0){
 5  //打开文件夹
 6  $dir_handle = opendir($path);
 7  //读取文件夹
 8  while(false !== $file = readdir($dir_handle)){
 9    if ($file == '.' || $file == '..') continue;
10    echo str_repeat('-', $deep*4), $file, '<br>';
11    //是否是目录
12    if (is_dir($path.'/'.$file)) {
13      //是目录，调用自身
14      $func_name = __FUNCTION__;
15      $func_name($path.'/'.$file, $deep+1);
16    }
17  }
18  //关闭文件夹
19  closedir($dir_handle);
20}
21
22read_dirs_tree($path);

  1<?php
  2class Upload{
  3  private $_max_size;
  4  private $_type_map;
  5  private $_allow_ext_list;
  6  private $_allow_mime_list;
  7  private $_upload_path;
  8  private $_prefix;
  9  //存储文件上传的错误信息
 10  private $_error;
 11  public function getError() {
 12    return $this->_error;
 13  }
 14
 15  public function __construct() {
 16    $this->_max_size = 1024*1024;
 17    //设置一个后缀名与mime的映射关系，就可以只修改允许的后缀名，就可以影响到$allow_ext_list和$allow_mime_list
 18    $this->_type_map = array(
 19      '.png'  => array('image/png', 'image/x-png'),
 20      '.jpg'  => array('image/jpeg', 'image/pjpeg'),
 21      '.jpeg' => array('image/jpeg', 'image/pjpeg'),
 22      '.gif'  => array('image/gif'),
 23      );
 24    $this->_allow_ext_list = array('.png', '.jpg');
 25    $allow_mime_list = array();
 26    foreach($this->_allow_ext_list as $value) {
 27      //得到每个后缀名（将所有$this->_type_map下的数组元素合并成新数组）
 28      $allow_mime_list = array_merge($allow_mime_list, $this->_type_map[$value]);
 29    }
 30    // 去重
 31    $this->_allow_mime_list = array_unique($allow_mime_list);
 32    // 合并，去重后$allow_mime_list = array('image/png', 'image/gif', 'image/jpeg', 'image/pjpeg', 'image/x-png');
 33    $this->_upload_path = './';
 34    $this->_prefix = '';
 35  }
 36
 37  public function __set($p, $v) {//属性重载
 38    $allow_set_list = array('_upload_path', '_prefix', '_allow_ext_list', '_max_size');
 39    //给没有加上"_"的参数添加"_"
 40    if(substr($p, 0, 1) !== '_') {
 41      $p = '_' . $p;
 42    }
 43
 44    $this->$p = $v;
 45  }
 46
 47
 48  /**
 49    * 上传单个文件
 50    */
 51  public function uploadOne($tmp_file) {
 52
 53    # 是否存在错误
 54    if($tmp_file['error'] != 0) {
 55      $this->_error = '文件上传错误';
 56      return false;
 57    }
 58
 59    # 尺寸
 60    if ($tmp_file['size'] > $this->_max_size) {
 61      $this->_error = '文件过大';
 62      return false;
 63    }
 64
 65    # 类型
 66    # 从原始文件名中提取后缀
 67    $ext = strtolower(strrchr($tmp_file['name'], '.'));
 68    if (!in_array($ext, $this->_allow_ext_list)) {
 69      $this->_error = '类型不合法';
 70      return false;
 71    }
 72
 73    # MIME, type元素。
 74    if (!in_array($tmp_file['type'], $this->_allow_mime_list)) {
 75      $this->_error = '类型不合法';
 76      return false;
 77    }
 78
 79    //PHP自己获取文件的mime，进行检测
 80    $finfo = new Finfo(FILEINFO_MIME_TYPE);//获得一个可以检测文件MIME类型信息的对象
 81    $mime_type = $finfo->file($tmp_file['tmp_name']);//检测
 82    if (!in_array($mime_type, $this->_allow_mime_list)) {
 83      $this->_error = '类型不合法';
 84      return false;
 85    }
 86
 87    # 移动
 88    # 上传文件存储地址
 89    //创建子目录
 90    $subdir = date('YmdH') . '/';
 91    if(!is_dir($this->_upload_path . $subdir)) {//检测是否存在
 92      //不存在
 93      mkdir($this->_upload_path . $subdir);
 94    }
 95
 96    # 上传文件起名
 97    $upload_filename = uniqID($this->_prefix, true) . $ext;
 98    if (move_uploaded_file($tmp_file['tmp_name'], $this->_upload_path . $subdir . $upload_filename)) {
 99      // 移动成功，返回文件名
100      return $subdir . $upload_filename;
101    } else {
102      // 移动失败
103      $this->_error = '移动失败';
104      return false;
105    }
106
107  }
108}
109var_dump($_FILES);
110if ($_FILES) {
111  $upload = new Upload();
112
113  if ($new_filename = $upload->uploadOne($_FILES['upload_file'])) {
114    echo $new_filename;
115  }else{
116    echo $upload->getError();
117  }
118}

1<?php
2$file = './test.txt';
3$content = date('H:i:s').'\n';
4var_dump(file_put_contents($file, $content));//返回字节数
5
6file_put_contents($file, $content, FILE_APPEND);//追加写
7
8var_dump(file_get_contents($file));

 1<?php
 2$file = './test.txt';
 3header('Content-type:text/html;charset=utf-8');
 4$file_handle = fopen($file, 'w+');
 5fwrite($file_handle, "中文字符和字节");
 6
 7fseek($file_handle, 0);
 8echo'fread：',fread($file_handle, 5),'<hr/>';//中？
 9echo'fgets：',fgets($file_handle, 2),'<hr/>';//?
10echo'fgetc：',fgetc($file_handle),'<hr/>';//?
11echo'ftell：',ftell($file_handle),'<hr/>';//7
12echo'filemtime：',filemtime($file),'<hr/>';//1487850244
13echo'filesize：',filesize($file),'<hr/>';//21(3*7)
14fclose($file_handle);