该购物车类是基于CodeIgniter的购物车类仿写实现的

2019-07-16 作者:编程   |   浏览(90)

正文实例叙述了php文件减弱之PHPZip类用法。分享给大家供大家参照他事他说加以考察。具体如下:

正文实例呈报了PHP正则验证Email的秘籍。分享给我们供大家参考。具体如下:

正文实例汇报了PHP完毕的购物车类。分享给大家供大家仿效。具体深入分析如下:

本文实例陈诉了php操作MongoDB类的主意。共享给大家供大家参照他事他说加以考察。具体如下:

<?php
//
// PHPZip v1.2 by Sext (sext@neud.net) 
//
// Makes zip archive
//
// Based on "Zip file creation class", uses zLib
//
//
class PHPZip
{
function Zip($dir, $zipfilename)
{
    if (@function_exists('gzcompress'))
    {
     $curdir = getcwd();
     if (is_array($dir))
     {
          $filelist = $dir;
     }
     else
     {
      $filelist = $this -> GetFileList($dir);
     }
     if ((!empty($dir))&&(!is_array($dir))&&(file_exists($dir))) chdir($dir);
     else chdir($curdir);
     if (count($filelist)>0)
     {
      foreach($filelist as $filename)
      {
          if (is_file($filename))
          {
           $fd = fopen ($filename, "r");
           $content = fread ($fd, filesize ($filename));
           fclose ($fd);
           if (is_array($dir)) $filename = basename($filename);
           $this -> addFile($content, $filename);
          }
      }
      $out = $this -> file();
      chdir($curdir);
      $fp = fopen($zipfilename, "w");
      fwrite($fp, $out, strlen($out));
      fclose($fp);
     }
     return 1;
    }
    else return 0;
}
function GetFileList($dir)
{
    if (file_exists($dir))
    {
     $args = func_get_args();
     $pref = $args[1];
     $dh = opendir($dir);
     while($files = readdir($dh))
     {
      if (($files!=".")&&($files!=".."))
      {
          if (is_dir($dir.$files))
          {
           $curdir = getcwd();
           chdir($dir.$files);
           $file = array_merge($file, $this -> GetFileList("", "$pref$files/"));
           chdir($curdir);
          }
          else $file[]=$pref.$files;
      }
     }
     closedir($dh);
    }
    return $file;
}
var $datasec  = array();
var $ctrl_dir   = array();
var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
var $old_offset = 0;
/**
  * Converts an Unix timestamp to a four byte DOS date and time format (date
  * in high two bytes, time in low two bytes allowing magnitude comparison).
  *
  * @param  integer  the current Unix timestamp
  *
  * @return integer  the current date in a four byte DOS format
  *
  * @access private
  */
function unix2DosTime($unixtime = 0) {
    $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
    if ($timearray['year'] < 1980) {
     $timearray['year'] = 1980;
     $timearray['mon']   = 1;
     $timearray['mday'] = 1;
     $timearray['hours'] = 0;
     $timearray['minutes'] = 0;
     $timearray['seconds'] = 0;
    } // end if
    return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
      ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
} // end of the 'unix2DosTime()' method
/**
  * Adds "file" to archive
  *
  * @param  string file contents
  * @param  string name of the file in the archive (may contains the path)
  * @param  integer  the current timestamp
  *
  * @access public
  */
function addFile($data, $name, $time = 0)
{
    $name   = str_replace('', '/', $name);

    $dtime = dechex($this->unix2DosTime($time));
    $hexdtime = 'x' . $dtime[6] . $dtime[7]
        . 'x' . $dtime[4] . $dtime[5]
        . 'x' . $dtime[2] . $dtime[3]
        . 'x' . $dtime[0] . $dtime[1];
    eval('$hexdtime = "' . $hexdtime . '";');
    $fr = "x50x4bx03x04";
    $fr .= "x14x00";     // ver needed to extract
    $fr .= "x00x00";     // gen purpose bit flag
    $fr .= "x08x00";     // compression method
    $fr .= $hexdtime;     // last mod time and date

    // "local file header" segment
    $unc_len = strlen($data);
    $crc   = crc32($data);
    $zdata = gzcompress($data);
    $c_len = strlen($zdata);
    $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
    $fr  .= pack('V', $crc);     // crc32
    $fr  .= pack('V', $c_len);      // compressed filesize
    $fr  .= pack('V', $unc_len);    // uncompressed filesize
    $fr  .= pack('v', strlen($name)); // length of filename
    $fr  .= pack('v', 0);       // extra field length
    $fr  .= $name;
    // "file data" segment
    $fr .= $zdata;
    // "data descriptor" segment (optional but necessary if archive is not
    // served as file)
    $fr .= pack('V', $crc);         // crc32
    $fr .= pack('V', $c_len);       // compressed filesize
    $fr .= pack('V', $unc_len);     // uncompressed filesize
    // add this entry to array
    $this -> datasec[] = $fr;
    $new_offset    = strlen(implode('', $this->datasec));
    // now add to central directory record
    $cdrec = "x50x4bx01x02";
    $cdrec .= "x00x00";       // version made by
    $cdrec .= "x14x00";       // version needed to extract
    $cdrec .= "x00x00";       // gen purpose bit flag
    $cdrec .= "x08x00";       // compression method
    $cdrec .= $hexdtime;         // last mod time & date
    $cdrec .= pack('V', $crc);      // crc32
    $cdrec .= pack('V', $c_len);    // compressed filesize
    $cdrec .= pack('V', $unc_len);  // uncompressed filesize
    $cdrec .= pack('v', strlen($name) ); // length of filename
    $cdrec .= pack('v', 0 );     // extra field length
    $cdrec .= pack('v', 0 );     // file comment length
    $cdrec .= pack('v', 0 );     // disk number start
    $cdrec .= pack('v', 0 );     // internal file attributes
    $cdrec .= pack('V', 32 );     // external file attributes - 'archive' bit set
    $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
    $this -> old_offset = $new_offset;
    $cdrec .= $name;
    // optional extra field, file comment goes here
    // save to central directory
    $this -> ctrl_dir[] = $cdrec;
} // end of the 'addFile()' method
/**
  * Dumps out file
  *
  * @return  string  the zipped file
  *
  * @access public
  */
function file()
{
    $data = implode('', $this -> datasec);
    $ctrldir = implode('', $this -> ctrl_dir);

    return
     $data .
     $ctrldir .
     $this -> eof_ctrl_dir .
     pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
     pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
     pack('V', strlen($ctrldir)) .      // size of central dir
     pack('V', strlen($data)) .       // offset to start of central dir
     "x00x00";               // .zip file comment length
} // end of the 'file()' method
} // end of the 'PHPZip' class
?>
<?php
function validateEmail($email)
{
 $isValid = true;
 $atIndex = strrpos($email, "@");
 if (is_bool($atIndex) && !$atIndex)
 {
  $isValid = false;
 }
 else
 {
  $domain = substr($email, $atIndex 1);
  $local = substr($email, 0, $atIndex);
  $localLen = strlen($local);
  $domainLen = strlen($domain);
  if ($localLen < 1 || $localLen > 64)
  {
   // local part length exceeded
   $isValid = false;
  }
  else if ($domainLen < 1 || $domainLen > 255)
  {
   // domain part length exceeded
   $isValid = false;
  }
  else if ($local[0] == '.' || $local[$localLen-1] == '.')
  {
   // local part starts or ends with '.'
   $isValid = false;
  }
  else if (preg_match('/\.\./', $local))
  {
   // local part has two consecutive dots
   $isValid = false;
  }
  else if (!preg_match('/^[A-Za-z0-9\-\.] $/', $domain))
  {
   // character not valid in domain part
   $isValid = false;
  }
  else if (preg_match('/\.\./', $domain))
  {
   // domain part has two consecutive dots
   $isValid = false;
  }
  else if(!preg_match('/^(\\.|[A-Za-z0-9!#%&`_=\/$'* ?^{}|~.-]) $/', str_replace("\\","",$local)))
  {
   // character not valid in local part unless 
   // local part is quoted
   if (!preg_match('/^"(\\"|[^"]) "$/', str_replace("\\","",$local)))
   {
   $isValid = false;
   }
  }
  if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A")))
  {
   // domain not found in DNS
   $isValid = false;
  }
 }
 return $isValid;
}
?>

该购物车类是依照CodeIgniter的购物车类仿写达成的。

  1. MyMongo.php文件:

应用方法:

PS:这里再为大家提供2款非常有利的正则表明式工具供大家参谋使用:

购物车基本效率如下:

<?php
/**
 * 仿写CI的MongoDB
 * @author sparkHuang 2011-11-03
 *
 */
class MyMongo {
  private $mongo_config = "mongo_config.php";
  private $connection;
  private $db;
  private $mongo_connect_string;
  private $host;
  private $port;
  private $user;
  private $pass;
  private $dbname;
  private $persist;
  private $persist_key;
  private $selects = array();
  private $wheres = array();
  private $sorts = array();
  private $limit = 999999;
  private $offset = 0;
  public function __construct() {
    if ( ! class_exists('Mongo')) {
      $this->log_error("The MongoDB PECL extentiosn has not been installed or enabled.");
      exit;
    }

    $this->connection_string();
    $this->connect();
  }
  /**
   * 更改数据库
   *
   */
  public function switch_db($database = '') {
    if (empty($database)) {
      $this->log_error("To switch MongoDB databases, a new database name must be specified");
      exit;
    }
    $this->dbname = $database;
    try {
      $this->db = $this->connection->{$this->dbname};
      return true;
    } catch(Exception $e) {
      $this->log_error("Unable to switch Mongo Databases: {$e->getMessage()}");
      exit;
    }
  }
  /**
   * 设置select字段
   *
   */
  public function select($includs = array(), $excludes = array()) {
    if ( ! is_array($includs)) {
      $includs = (array)$includs;
    }

    if ( ! is_array($excludes)) {
      $excludes = (array)$excludes;
    }

    if ( ! empty($includs)) {
      foreach ($includs as $col) {
        $this->selects[$col] = 1;
      }
    } else {
      foreach ($excludes as $col) {
        $this->selects[$col] = 0;
      }
    }

    return($this);
  }
  /**
   * where条件查询判断
   *
   * @usage = $this->mongo_db->where(array('foo' => 'bar'))->get('foobar');
   *
   */
  public function where($wheres = array()) {
    if ( ! is_array($wheres)) {
      $wheres = (array)$wheres;
    }

    if ( ! empty($wheres)) {
      foreach($wheres as $wh => $val) {
        $this->wheres[$wh] = $val;
      }
    }

    return($this);
  }
  /**
   * where ... in .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_in('foo', array('bar', 'zoo'))->get('foobar');
   *
   */
  public function where_in($field = '', $in = array()) {
    $this->where_init($field);
    $this->wheres[$field]['$in'] = $in;
    return($this);
  }
  /**
   * where ... not in .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_not_in('foo', array('bar', 'zoo'))->get('foobar');
   *
   */
  public function where_not_in($field = '', $in = array()) {
    $this->where_init($field);
    $this->wheres[$field]['$nin'] = $in;
    return($this);
  }
  /**
   * where ... $field > $x .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_gt('foo', 20)->get('foobar');
   *
   */
  public function where_gt($field = '', $x) {
    $this->where_init($field);
    $this->wheres[$field]['$gt'] = $x;
    return($this);
  }
  /**
   * where ... $field >= $x .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_gte('foo', 20)->get('foobar');
   *
   */
  public function where_gte($field = '', $x) {
    $this->where_init($field);
    $this->wheres[$field]['$gte'] = $x;
    return($this);
  }
  /**
   * where ... $field < $x .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_lt('foo', 20)->get('foobar');
   *
   */
  public function where_lt($field = '', $x) {
    $this->where_init($field);
    $this->wheres[$field]['$lt'] = $x;
    return($this);
  }
  /**
   * where ... $field <= $x .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_lte('foo', 20)->get('foobar');
   *
   */
  public function where_lte($field = '', $x) {
    $this->where_init($field);
    $this->wheres[$field]['$lte'] = $x;
    return($this);
  }
  /**
   * where ... $field >= $x AND $field <= $y .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_between('foo', 20, 30)->get('foobar');
   *
   */
  public function where_between($field = '', $x, $y) {
    $this->where_init($field);
    $this->wheres[$field]['$gte'] = $x;
    $this->wheres[$field]['$lte'] = $y;
    return($this);
  }
  /**
   * where ... $field > $x AND $field < $y .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_between_ne('foo', 20, 30)->get('foobar');
   *
   */
  public function where_between_ne($field = '', $x, $y) {
    $this->where_init($field);
    $this->wheres[$field]['$gt'] = $x;
    $this->wheres[$field]['$lt'] = $y;
    return($this);
  }
  /**
   * where ... $field <> $x .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_ne('foo', 20)->get('foobar');
   *
   */
  public function where_ne($field = '', $x) {
    $this->where_init($field);
    $this->wheres[$field]['$ne'] = $x;
    return($this);
  }
  /**
   * where ... or .. 条件查询判断
   *
   * @usage = $this->mongo_db->where_or('foo', array('foo', 'bar'))->get('foobar');
   *
   */
  public function where_or($field = '', $values) {
    $this->where_init($field);
    $this->wheres[$field]['$or'] = $values;
    return($this);
  }
  /**
   *  where ... and .. 条件查询判断
   *  
   *  @usage = $this->mongo_db->where_and( array ( 'foo' => 1, 'b' => 'someexample' );
   */
   public function where_and( $elements_values = array() ) {
     foreach ( $elements_values as $element => $val ) {
       $this->wheres[$element] = $val;
     }
     return($this);
   }
  /**
   *  where $field % $num = $result
   *
   *  @usage = $this->mongo_db->where_mod( 'foo', 10, 1 );
   */   
   public function where_mod( $field, $num, $result ) {
     $this->where_init($field);
     $this->wheres[$field]['$mod'] = array($num, $result);
     return($this);
   }
  /**
   * where size
   *
   *  Get the documents where the size of a field is in a given $size int
   *
   *  @usage : $this->mongo_db->where_size('foo', 1)->get('foobar');
   */
  public function where_size($field = "", $size = "") {
    $this->where_init($field);
    $this->wheres[$field]['$size'] = $size;
    return ($this);
  }
  /**
   * like条件查询(PHP中定义MongoRegex类实现)
   *
   * @usage : $this->mongo_db->like('foo', 'bar', 'im', false, false)->get();
   */
  public function like($field = "", $value = "", $flags = "i", $enable_start_wildcard = true, $enable_end_wildcard = true) {
    $field = (string)$field;
    $this->where_init($field);
    $value = (string)$value;
    $value = quotmeta($value);

    if (true !== $enable_start_wildcard) {
      $value = "^".$value;
    }

    if (true !== $enable_end_wildcard) {
      $value .= "$";
    }

    $regex = "/$value/$flags";
    $this->wheres[$field] = new MongoRegex($regex);
    return($this);
  }
  /**
   * order排序( 1 => ASC, -1 => DESC)
   *
   * @usage: $this->mongo_db->get_where('foo', array('name' => 'tom'))->order_by(array("age" => 1));
   */
  public function order_by($fields = array()) {
    foreach($fields as $col => $val) {
      if ($val == -1 || $val == false || strtolower($val) == "desc") {
        $this->sorts[$col] = -1;
      } else {
        $this->sorts[$col] = 1;
      }
    }
    return($this);
  }
  /**
   * limit
   *
   * @usage: $this->mongo_db->get_where('foo', array('name' => 'tom'))->limit(10);
   */
  public function limit($x = 999999) {
    if ($x !== NULL && is_numeric($x) && $x >= 1) {
      $this->limit = (int)$x;
    }
    return($this);
  }
  /**
   * offset
   *
   * @usage: $this->mongo_db->get_where('foo', array('name' => 'tom'))->offset(10);
   */
  public function offset($x = 0) {
     if($x !== NULL && is_numeric($x) && $x >= 1) {
       $this->offset = (int) $x;
     }
     return($this);
  }
  /**
   * get_where
   * 
   * @usage: $this->mongo_db->get_where('foo', array('bar' => 'something'));
   */
  public function get_where($collection = "", $where = array(), $limit = 999999) {
    return($this->where($where)->limit($limit)->get($collection));
  }
  /**
   * get
   *
   * @usage: $this->mongo_db->where(array('name' => 'tom'))->get('foo');
   */
  public function get($collection) {
    if (empty($collection)) {
      $this->log_error("In order to retreive documents from MongoDB, a collection name must be passed");
      exit;
    }
    $results = array();
    $results = $this->db->{$collection}->find($this->wheres, $this->selects)->limit((int)$this->limit)->skip((int)$this->offset)->sort($this->sorts);
    $returns = array();
    foreach($results as $result) {
      $returns[] = $result;
    }
    $this->clear();
    return($returns);
  }
  /**
   * count
   *
   * @usage: $this->db->get_where('foo', array('name' => 'tom'))->count('foo'); 
   */
  public function count($collection) {
    if (empty($collection)) {
      $this->log_error("In order to retreive documents from MongoDB, a collection name must be passed");
      exit;
    }
    $count = $this->db->{$collection}->find($this->wheres)->limit((int)$this->limit)->skip((int)$this->offset)->count();
    $this->clear();
    return($count);
  }
  /**
   * insert
   *
   * @usage: $this->mongo_db->insert('foo', array('name' => 'tom'));
   */
  public function insert($collection = "", $data = array()) {
    if (empty($collection)) {
      $this->log_error("No Mongo collection selected to delete from");
      exit;
    }
    if (count($data) == 0 || ! is_array($data)) {
      $this->log_error("Nothing to insert into Mongo collection or insert is not an array");
      exit;
    }
    try {
      $this->db->{$collection}->insert($data, array('fsync' => true));
      if (isset($data['_id'])) {
        return($data['_id']);
      } else {
        return(false);
      }
    } catch(MongoCursorException $e) {
      $this->log_error("Insert of data into MongoDB failed: {$e->getMessage()}");
      exit;
    }
  }
  /**
   * update : 利用MongoDB的 $set 实现
   *
   * @usage : $this->mongo_db->where(array('name' => 'tom'))->update('foo', array('age' => 24))
   */
  public function update($collection = "", $data = array()) {
    if (empty($collection)) {
      $this->log_error("No Mongo collection selected to delete from");
      exit;
    }
    if (count($data) == 0 || ! is_array($data)) {
      $this->log_error("Nothing to update in Mongo collection or update is not an array");
      exit;
    }
    try {
      $this->db->{$collection}->update($this->wheres, array('$set' => $data), array('fsync' => true, 'multiple' => false)); //注意: multiple为false
      return(true);
    } catch(MongoCursorException $e) {
      $this->log_error("Update of data into MongoDB failed: {$e->getMessage()}");
      exit;
    }
  }
  /**
   * update_all : 利用MongoDB的 $set 实现
   *
   * @usage : $this->mongo_db->where(array('name' => 'tom'))->update_all('foo', array('age' => 24));
   */
  public function update_all($collection = "", $data = array()) {
    if (empty($collection)) {
      $this->log_error("No Mongo collection selected to delete from");
      exit;
    }
    if (count($data) == 0 || ! is_array($data)) {
      $this->log_error("Nothing to update in Mongo collection or update is not an array");
      exit;
    }
    try {
      $this->db->{$collection}->update($this->wheres, array('$set' => $data), array('fsync' => true, 'multiple' => true)); //注意: multiple为true
      return(true);
    } catch(MongoCursorException $e) {
      $this->log_error("Update of data into MongoDB failed: {$e->getMessage()}");
      exit;
    }
  }
  /**
   * delete 
   *
   * @usage : $this->mongo_db->where(array('name' => 'tom'))->delete('foo');
   */
  public function delete($collection = "") {
    if (empty($collection)) {
      $this->log_error("No Mongo collection selected to delete from");
      exit;
    }
    try {
      $this->db->{$collection}->remove($this->wheres, array('fsync' => true, 'justOne' => true)); //注意justOne为true;
    } catch(MongoCursorException $e) {
      $this->log_error("Delete of data into MongoDB failed: {$e->getMessage()}");
      exit;
    }
  }  
  /**
   * delete_all
   *
   * @usage : $this->mongo_db->where(array('name' => 'tom'))->delete_all('foo');
   */
  public function delete_all($collection = "") {
    if (empty($collection)) {
      $this->log_error("No Mongo collection selected to delete from");
      exit;
    }
    try {
      $this->db->{$collection}->remove($this->wheres, array('fsync' => true, 'justOne' => false)); //注意justOne为false;
    } catch(MongoCursorException $e) {
      $this->log_error("Delete of data into MongoDB failed: {$e->getMessage()}");
      exit;
    }
  }
  /** 
   * add_index
   *
   * @usage : $this->mongo_db->add_index('foo', array('first_name' => 'ASC', 'last_name' => -1), array('unique' => true)));
   */
  public function add_index($collection, $keys = array(), $options = array()) {
    if (empty($collection)) {
      $this->log_error("No Mongo collection specified to add index to");
      exit;
    }
    if (empty($keys) || ! is_array($keys)) {
      $this->log_error("Index could not be created to MongoDB Collection because no keys were specified");
      exit;
    }
    foreach($keys as $col => $val) {
      if ($val == -1 || $val == false || strtolower($val) == 'desc') {
        $keys[$col] = -1;
      } else {
        $keys[$col] = 1;
      }
    }
    //在此没有对$options数组的有效性进行验证
    if (true == $this->db->{$collection}->ensureIndex($keys, $options)) {
      $this->clear();
      return($this);
    } else {
      $this->log_error("An error occured when trying to add an index to MongoDB Collection");
      exit;
    }
  }
  /**
   * remove_index
   *
   * @usage : $this->mongo_db->remove_index('foo', array('first_name' => 'ASC', 'last_name' => -1))
   */
  public function remove_index($collection = "", $keys = array()) {
    if (empty($collection)) {
      $this->log_error("No Mongo collection specified to add index to");
      exit;
    }
    if (empty($keys) || ! is_array($keys)) {
      $this->log_error("Index could not be created to MongoDB Collection because no keys were specified");
      exit;
    }
    if ($this->db->{$collection}->deleteIndex($keys)) {
      $this->clear();
      return($this);
    } else {
      $this->log_error("An error occured when trying to add an index to MongoDB Collection");
      exit;
    }
  }
  /**
   * remove_all_index
   *
   * @usage : $this->mongo_db->remove_all_index('foo', array('first_name' => 'ASC', 'last_name' => -1))
   */
  public function remove_all_index($collection = "", $keys = array()) {
    if (empty($collection)) {
      $this->log_error("No Mongo collection specified to add index to");
      exit;
    }
    if (empty($keys) || ! is_array($keys)) {
      $this->log_error("Index could not be created to MongoDB Collection because no keys were specified");
      exit;
    }
    if ($this->db->{$collection}->deleteIndexes($keys)) {
      $this->clear();
      return($this);
    } else {
      $this->log_error("An error occured when trying to add an index to MongoDB Collection");
      exit;
    }
  }
  /**
   * list_indexes
   *
   * @usage : $this->mongo_db->list_indexes('foo');
   */
  public function list_indexes($collection = "") {
    if (empty($collection)) {
      $this->log_error("No Mongo collection specified to add index to");
      exit;
    }
    return($this->db->{$collection}->getIndexInfo());
  }
  /**
   * drop_collection
   *
   * @usage : $this->mongo_db->drop_collection('foo');
   */
  public function drop_collection($collection = "") {
    if (empty($collection)) {
      $this->log_error("No Mongo collection specified to add index to");
      exit;
    }
    $this->db->{$collection}->drop();
    return(true);
  }
  /**
   * 生成连接MongoDB 参数字符串
   *
   */
  private function connection_string() {
    include_once($this->mongo_config);
    $this->host = trim($config['host']);
    $this->port = trim($config['port']);
    $this->user = trim($config['user']);
    $this->pass = trim($config['pass']);
    $this->dbname = trim($config['dbname']);
    $this->persist = trim($config['persist']);
    $this->persist_key = trim($config['persist_key']);
    $connection_string = "mongodb://";
    if (empty($this->host)) {
      $this->log_error("The Host must be set to connect to MongoDB");
      exit;
    }
    if (empty($this->dbname)) {
      $this->log_error("The Database must be set to connect to MongoDB");
      exit;
    }
    if ( ! empty($this->user) && ! empty($this->pass)) {
      $connection_string .= "{$this->user}:{$this->pass}@";
    }
    if ( isset($this->port) && ! empty($this->port)) {
      $connection_string .= "{$this->host}:{$this->port}";
    } else {
      $connection_string .= "{$this->host}";
    }
    $this->connection_string = trim($connection_string);
  }
  /**
   * 连接MongoDB 获取数据库操作句柄
   *
   */
  private function connect() {
    $options = array();
    if (true === $this->persist) {
      $options['persist'] = isset($this->persist_key) && ! empty($this->persist_key) ? $this->persist_key : "ci_mongo_persist";
    }
    try {
      $this->connection = new Mongo($this->connection_string, $options);
      $this->db = $this->connection->{$this->dbname};
      return ($this);
    } catch (MongoConnectionException $e) {
      $this->log_error("Unable to connect to MongoDB: {$e->getMessage()}");
    }
  }
  /**
   * 初始化清理部分成员变量
   * 
   */
  private function clear() {
    $this->selects = array();
    $this->wheres = array();
    $this->limit = NULL;
    $this->offset = NULL;
    $this->sorts = array();
  }
  /**
   * 依据字段名初始化处理$wheres数组
   *
   */
  private function where_init($param) {
    if ( ! isset($this->wheres[$param])) {
      $this->wheres[$param] = array();
    }
  }
  /**
   * 错误记录
   *
   */
  private function log_error($msg) {
    $msg = "[Date: ".date("Y-m-i H:i:s")."] ".$msg;
    @file_put_contents("./error.log", print_r($msg."n", true), FILE_APPEND);
  }
}
/* End of MyMongo.php */

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