Analyze mongodb operation classes in php

This article mainly introduces the mongodb operation class implemented by PHP. It analyzes various common techniques of PHP for mongodb database operation in more detail, and encapsulates them into a complete class file for easy calling. It is very practical. Value, friends who need it can refer to

The example in this article describes the mongodb operation class implemented by PHP. Share it with everyone for your reference. The details are as follows:

<?php 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */ 
class mongo_db { 
  private $config; 
  private $connection; 
  private $db; 
  private $connection_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; 
  private $timeout = 200; 
  private $key = 0; 
  /**
  *
  * CONSTRUCTOR *
  *
  * Automatically check if the Mongo PECL extension has been
  installed/enabled.
  * Generate the connection string and establish a connection
  to the MongoDB.
  */ 
  public function __construct() { 
    if((IS_NOSQL != 1)){ 
      return; 
    } 
    if (!class_exists(&#39;Mongo&#39;)) { 
      //$this->error("The MongoDB PECL extension has not been installed or enabled", 500); 
    } 
    $configs =wxcity_base::load_config("cache","mongo_db"); 
    $num = count($configs[&#39;connect&#39;]); 
    $this->timeout = trim($configs[&#39;timeout&#39;]); 
    $keys = wxcity_base::load_config(&#39;double&#39;); 
    $this->key = $keys[&#39;mongo_db&#39;]; 
    $this->config = $configs[&#39;connect&#39;][$this->key]; 
    $status = $this->connect(); 
    if($status == false) 
    { 
      for($i = 1; $i < $num; $i++) 
      { 
        $n = $this->key + $i; 
        $key = $n >= $num ? $n - $num : $n; 
        $this->config = $configs[&#39;connect&#39;][$key]; 
        $status = $this->connect(); 
        if($status!=false) 
        { 
          $keys[&#39;mongo_db&#39;] = $key ; 
          $this->key = $key; 
          $data = "<?php\nreturn ".var_export($keys, true).";\n?>"; 
          file_put_contents(WHTY_PATH.&#39;configs/double.php&#39;, $data, LOCK_EX); 
          break; 
        } 
      } 
    } 
    if($status==false) 
    { 
      die(&#39;mongoDB not connect&#39;); 
    } 
  } 
  function __destruct() { 
    if((IS_NOSQL != 1)){ 
      return; 
    } 
    if($this->connection) 
    { 
      $this->connection->close(); 
    } 
  } 
    /**
 *
 * CONNECT TO MONGODB  *
 *
 * Establish a connection to MongoDB using
 the connection string generated in
 * the connection_string() method.
 If &#39;mongo_persist_key&#39; was set to true in the  
 * config file, establish a persistent connection.
 We allow for only the &#39;persist&#39;
 * option to be set because we want to 
 establish a connection immediately.
 */ 
  private function connect() { 
    $this->connection_string(); 
    $options = array(&#39;connect&#39;=>true,&#39;timeout&#39;=>$this->timeout); 
    try { 
      $this->connection = new Mongo($this->connection_string, $options); 
      $this->db = $this->connection->{$this->dbname}; 
      return($this); 
    } catch (MongoConnectionException $e) { 
      return false; 
    } 
  } 
  /**
  *
  * BUILD CONNECTION STRING *
  *
  * Build the connection string from the config file.
  */ 
  private function connection_string() { 
    $this->host = trim($this->config[&#39;hostname&#39;]); 
    $this->port = trim($this->config[&#39;port&#39;]); 
    $this->user = trim($this->config[&#39;username&#39;]); 
    $this->pass = trim($this->config[&#39;password&#39;]); 
    $this->dbname = trim($this->config[&#39;database&#39;]); 
    $this->persist = trim($this->config[&#39;autoconnect&#39;]); 
    $this->persist_key = trim($this->config[&#39;mongo_persist_key&#39;]); 
    $connection_string = "mongodb://"; 
    if (emptyempty($this->host)) { 
      $this->error("The Host must be set to connect to MongoDB", 500); 
    } if (emptyempty($this->dbname)) { 
      $this->error("The Database must be set to connect to MongoDB", 500); 
    } if (!emptyempty($this->user) && !emptyempty($this->pass)) { 
      $connection_string .= "{$this->user}:{$this->pass}@"; 
    } if (isset($this->port) && !emptyempty($this->port)) { 
      $connection_string .= "{$this->host}:{$this->port}"; 
    } else { 
      $connection_string .= "{$this->host}"; 
    } $this->connection_string = trim($connection_string); 
  } 
  /**
  *
  * Switch_db  *
  *
  * Switch from default database to a different db
  */ 
  public function switch_db($database = &#39;&#39;) { 
    if (emptyempty($database)) { 
      $this->error("To switch MongoDB databases, a new database name must be specified", 500); 
    } $this->dbname = $database; 
    try { 
      $this->db = $this->connection->{$this->dbname}; 
      return(TRUE); 
    } catch (Exception $e) { 
      $this->error("Unable to switch Mongo Databases: {$e->getMessage()}", 500); 
    } 
  } 
  /**
  *
  * SELECT FIELDS  *
  *
  * Determine which fields to include OR which to
  exclude during the query process.
  * Currently, including and excluding at 
  the same time is not available, so the
  * $includes array will take precedence over
  the $excludes array.
  If you want to
  * only choose fields to exclude,
  leave $includes an empty array().
  *
  * @usage: $this->mongo_db->select(array(&#39;foo&#39;, &#39;bar&#39;))->get(&#39;foobar&#39;);
  */ 
  public function select($includes = array(), $excludes = array()) { 
    if (!is_array($includes)) { 
      $includes = array(); 
    } 
    if (!is_array($excludes)) { 
      $excludes = array(); 
    } 
    if (!emptyempty($includes)) { 
      foreach ($includes as $col) { 
        $this->selects[$col] = 1; 
      } 
    } else { 
      foreach ($excludes as $col) { 
        $this->selects[$col] = 0; 
      } 
    } return($this); 
  } 
  /**
  *
  * WHERE PARAMETERS   *
  *
  * Get the documents based on these
  search parameters. The $wheres array should
  * be an associative array with the field 
  as the key and the value as the search
  * criteria.  *
  * @usage = $this->mongo_db->where(array(&#39;foo&#39; => &#39;bar&#39;))->get(&#39;foobar&#39;);
  */ 
  public function where($wheres = array()) { 
    foreach ((array)$wheres as $wh => $val) { 
      $this->wheres[$wh] = $val; 
    } return($this); 
  } 
  /**
  *
  * WHERE_IN PARAMETERS *
  *
  * Get the documents where the value 
  of a $field is in a given $in array().
  *
  * @usage = $this->mongo_db->where_in(&#39;foo&#39;, array(&#39;bar&#39;, &#39;zoo&#39;, &#39;blah&#39;))->get(&#39;foobar&#39;);
  */ 
  public function where_in($field = "", $in = array()) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$in&#39;] = $in; 
    return($this); 
  } 
  /**
  *
  * WHERE_NOT_IN PARAMETERS *
  *
  * Get the documents where the value of 
  a $field is not in a given $in array().
  *
  * @usage = $this->mongo_db->where_not_in(&#39;foo&#39;, array(&#39;bar&#39;, &#39;zoo&#39;, &#39;blah&#39;))->get(&#39;foobar&#39;);
  */ 
  public function where_not_in($field = "", $in = array()) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$nin&#39;] = $in; 
    return($this); 
  } 
  /**
  *
  * WHERE GREATER THAN PARAMETERS  *
  *
  * Get the documents where the value of 
  a $field is greater than $x
  * 
  * @usage = $this->mongo_db->where_gt(&#39;foo&#39;, 20);
  */ 
  public function where_gt($field = "", $x) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$gt&#39;] = $x; 
    return($this); 
  } 
  /**
  *
  * WHERE GREATER THAN OR EQUAL TO PARAMETERS  *
  *
  * Get the documents where the value of a $field is greater than or equal to $x
  *
  * @usage = $this->mongo_db->where_gte(&#39;foo&#39;, 20);
  */ 
  public function where_gte($field = "", $x) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$gte&#39;] = $x; 
    return($this); 
  } 
  /**
  *
  * WHERE LESS THAN PARAMETERS  *
  *
  * Get the documents where the value of
  a $field is less than $x
  *
  * @usage = $this->mongo_db->where_lt(&#39;foo&#39;, 20);
  */ 
  public function where_lt($field = "", $x) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$lt&#39;] = $x; 
    return($this); 
  } 
  /**
  *
  * WHERE LESS THAN OR EQUAL TO PARAMETERS  *
  *
  * Get the documents where the value of 
  a $field is less than or equal to $x
  *
  * @usage = $this->mongo_db->where_lte(&#39;foo&#39;, 20);
  */ 
  public function where_lte($field = "", $x) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$lte&#39;] = $x; 
    return($this); 
  } 
  /**
  *
  * WHERE BETWEEN PARAMETERS   *
  *
  * Get the documents where the value of
  a $field is between $x and $y
  *
  * @usage = $this->mongo_db->where_between(&#39;foo&#39;, 20, 30);
  */ 
  public function where_between($field = "", $x, $y) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$gte&#39;] = $x; 
    $this->wheres[$field][&#39;$lte&#39;] = $y; 
    return($this); 
  } 
  /**
  *
  * WHERE BETWEEN AND NOT EQUAL TO PARAMETERS  *
  *
  * Get the documents where the value of 
  a $field is between but not equal to $x and $y
  *
  * @usage = $this->mongo_db->where_between_ne(&#39;foo&#39;, 20, 30);
  */ 
  public function where_between_ne($field = "", $x, $y) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$gt&#39;] = $x; 
    $this->wheres[$field][&#39;$lt&#39;] = $y; 
    return($this); 
  } 
  /**
  *
  * WHERE NOT EQUAL TO PARAMETERS  *
  *
  * Get the documents where the value of 
  a $field is not equal to $x
  *
  * @usage = $this->mongo_db->where_between(&#39;foo&#39;, 20, 30);
  */ 
  public function where_ne($field = "", $x) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$ne&#39;] = $x; 
    return($this); 
  } 
  /**
  *
  * WHERE OR   *
  *
  * Get the documents where the value of 
  a $field is in one or more values  
  *
  * @usage = $this->mongo_db->where_or(&#39;foo&#39;, array( &#39;foo&#39;, &#39;bar&#39;, &#39;blegh&#39; );
  */ 
  public function where_or($field = "", $values) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$or&#39;] = $values; 
    return($this); 
  } 
  /**
  *
  * WHERE AND  *
  *
  * Get the documents where the elements match 
  the specified values *
  * @usage = $this->mongo_db->where_and( array ( &#39;foo&#39; => 1, &#39;b&#39; => &#39;someexample&#39; );
  */ 
  public function where_and($elements_values = array()) { 
    foreach ((array)$elements_values as $element => $val) { 
      $this->wheres[$element] = $val; 
    } return($this); 
  } 
  /**
  *
  * WHERE MOD  *
  *
  * Get the documents where $field % $mod = $result *
  * @usage = $this->mongo_db->where_mod( &#39;foo&#39;, 10, 1 );
  */ 
  public function where_mod($field, $num, $result) { 
    $this->where_init($field); 
    $this->wheres[$field][&#39;$mod&#39;] = array($num, $result); 
    return($this); 
  } 
  /**   *    *  Where size *    *  *  Get the documents where the size of a field is in a given $size int *  *  @usage : $this->mongo_db->where_size(&#39;foo&#39;, 1)->get(&#39;foobar&#39;); */ 
  public function where_size($field = "", $size = "") { 
    $this->_where_init($field); 
    $this->wheres[$field][&#39;$size&#39;] = $size; 
    return ($this); 
  } 
  /**
  *
  * LIKE PARAMETERS *
  *
  * Get the documents where the (string) value of 
  a $field is like a value. The defaults
  * allow for a case-insensitive search.   *
  * @param $flags  
  * Allows for the typical regular expression flags:
  *   i = case insensitive
  *   m = multiline
  *   x = can contain comments
  *   l = locale  
  *   s = dotall, "." matches everything, including newlines
  *   u = match unicode
  *
  * @param $enable_start_wildcard
  * If set to anything other than TRUE, a starting line character "^" will be prepended
  * to the search value, representing only searching for a value at the start of
  * a new line.
  *  * @param $enable_end_wildcard 
  * If set to anything other than TRUE, an ending line character "$" will be appended
  * to the search value, representing only searching for a value at the end of
  * a line.
  * 
  * @usage = $this->mongo_db->like(&#39;foo&#39;, &#39;bar&#39;, &#39;im&#39;, FALSE, TRUE);
  */ 
  public function like($field = "", $value = "", $flags = "i", $enable_start_wildcard = TRUE, $enable_end_wildcard = TRUE) { 
    $field = (string) trim($field); 
    $this->where_init($field); 
    $value = (string) trim($value); 
    $value = quotemeta($value); 
    if ($enable_start_wildcard !== TRUE) { 
      $value = "^" . $value; 
    } if ($enable_end_wildcard !== TRUE) { 
      $value .= "$"; 
    } $regex = "/$value/$flags"; 
    $this->wheres[$field] = new MongoRegex($regex); 
    return($this); 
  } 
  public function wheres($where){ 
    $this->wheres = $where; 
  } 
  /**
  *
  * ORDER BY PARAMETERS *
  *
  * Sort the documents based on the parameters passed.
  To set values to descending order,
  * you must pass values of either -1, FALSE,
  &#39;desc&#39;, or &#39;DESC&#39;, else they will be
  * set to 1 (ASC).
  *
  * @usage = $this->mongo_db->where_between(&#39;foo&#39;, 20, 30);
  */ 
  public function order_by($fields = array()) { 
    if (!is_array($fields) || !count($fields)) return ; 
    foreach ($fields as $col => $val) { 
      if ($val == -1 || $val === FALSE || strtolower($val) == &#39;desc&#39;) { 
        $this->sorts[$col] = -1; 
      } else { 
        $this->sorts[$col] = 1; 
      } 
    } return($this); 
  } 
  /**
  *
  * LIMIT DOCUMENTS *
  *
  * Limit the result set to $x number of documents  *
  * @usage = $this->mongo_db->limit($x);
  */ 
  public function limit($x = 99999) { 
    if ($x !== NULL && is_numeric($x) && $x >= 1) { 
      $this->limit = (int) $x; 
    } return($this); 
  } 
  /**
  *
  * OFFSET DOCUMENTS   *
  *
  * Offset the result set to skip $x number of documents
  *
  * @usage = $this->mongo_db->offset($x);
  */ 
  public function offset($x = 0) { 
    if ($x !== NULL && is_numeric($x) && $x >= 1) { 
      $this->offset = (int) $x; 
    } return($this); 
  } 
  /**
  *
  * GET_WHERE  *
  *  
  * Get the documents based upon the passed parameters  *
  * @usage = $this->mongo_db->get_where(&#39;foo&#39;, array(&#39;bar&#39; => &#39;something&#39;));
  */ 
  public function get_where($collection = "", $where = array(), $limit = 99999, $orderby=array()) { 
    if (is_array($orderby) || !emptyempty($orderby)) { 
      $order_by = $this->order_by($order_by); 
    } 
    return($this->where($where)->limit($limit)->get($collection)); 
  } 
  public function selectA($collection = "", $limit = 99999, $orderby=array()) { 
    if(intval($limit)<1){ 
      $limit = 999999; 
    } 
    $order_by = $this->order_by($orderby); 
    $re = $this->limit($limit)->get($collection); 
    $this->clear(); 
    return (array)$re; 
  } 
  public function listinfo($collection = "", $orderby=array(), $page=1, $pagesize=12) { 
    $page = max(intval($page), 1); 
    $offset = $pagesize * ($page - 1); 
    $pagesizes = $offset + $pagesize; 
    $this->offset($offset); 
    $order_by = $this->order_by($orderby); 
    $re = $this->limit($pagesize)->get($collection); 
    $this->limit(999999); 
    $count = $this->count($collection); 
    $this->pages = pages($count, $page, $pagesize); 
    return (array)$re; 
  } 
  /**
  *
  * GET *
  *
  * Get the documents based upon the passed parameters  *
  * @usage = $this->mongo_db->get(&#39;foo&#39;, array(&#39;bar&#39; => &#39;something&#39;));
  */ 
  public function get($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("In order to retreive documents from MongoDB, a collection name must be passed", 500); 
    } $results = array(); 
    $documents = $this->db->{$collection}->find($this->wheres, $this->selects)->limit((int) $this->limit)->skip((int) $this->offset)->sort($this->sorts); 
    $returns = array(); 
    foreach ($documents as $doc): $returns[] = $doc; 
    endforeach; 
    return($returns); 
  } 
  public function getMy($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("In order to retreive documents from MongoDB, a collection name must be passed", 500); 
    } $results = array(); 
    $documents = $this->db->{$collection}->find($this->wheres, $this->selects)->limit((int) $this->limit)->skip((int) $this->offset)->sort($this->sorts); 
    $returns = array(); 
    foreach ($documents as $doc): $returns[] = $doc; 
    endforeach; 
    $this -> clear(); 
    return($returns); 
  } 
  /**
  *
  * COUNT  *
  *
  * Count the documents based upon the passed parameters *
  * @usage = $this->mongo_db->get(&#39;foo&#39;);
  */ 
  public function count($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("In order to retreive a count of documents from MongoDB, a collection name must be passed", 500); 
    } $count = $this->db->{$collection}->find($this->wheres)->limit((int) $this->limit)->skip((int) $this->offset)->count(); 
    $this->clear(); 
    return($count); 
  } 
  /**
  *
  * INSERT  *
  *
  * Insert a new document into the passed collection *
  * @usage = $this->mongo_db->insert(&#39;foo&#39;, $data = array());
  */ 
  public function insert($collection = "", $data = array(), $name=&#39;ID&#39;) { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection selected to insert into", 500); 
    } if (count($data) == 0 || !is_array($data)) { 
      $this->error("Nothing to insert into Mongo collection or insert is not an array", 500); 
    } try { 
    /**
      wxcity_base::load_sys_class(&#39;whtysqs&#39;,&#39;&#39;,0); 
      $mongoseq_class = new whtysqs(&#39;creaseidsqs&#39;);
      $re = $mongoseq_class->query("?name=" . $collection . "&opt=put&data=1");
    **/ 
      $re = put_sqs(&#39;list_mongo_creaseidsqs&#39;,&#39;1&#39;); 
      if(is_numeric($re)){ 
        $re++; 
        $data[$name] = intval($re); 
      }else{ 
        $data[$name] = intval(time()); 
        //die(&#39;mongosqs error&#39;); 
      } 
      $this->db->{$collection}->insert($data, array(&#39;fsync&#39; => TRUE)); 
      $this->clear(); 
      return $data[$name]; 
    } catch (MongoCursorException $e) { 
      $this->error("Insert of data into MongoDB failed: {$e->getMessage()}", 500); 
    } 
  } 
  public function insertWithId($collection = "", $data = array()) { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection selected to insert into", 500); 
    } if (count($data) == 0 || !is_array($data)) { 
      $this->error("Nothing to insert into Mongo collection or insert is not an array", 500); 
    } try { 
      $this->db->{$collection}->insert($data, array(&#39;fsync&#39; => TRUE)); 
      $this->clear(); 
      return 1; 
    } catch (MongoCursorException $e) { 
      $this->error("Insert of data into MongoDB failed: {$e->getMessage()}", 500); 
    } 
  } 
  /**
  *
  * UPDATE  *
  *
  * Update a document into the passed collection *
  * @usage = $this->mongo_db->update(&#39;foo&#39;, $data = array());
  */ 
  public function update($collection = "", $data = array()) { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection selected to update", 500); 
    } if (count($data) == 0 || !is_array($data)) { 
      $this->error("Nothing to update in Mongo collection or update is not an array", 500); 
    } try { 
      $this->db->{$collection}->update($this->wheres, array(&#39;$set&#39; => $data), array(&#39;fsync&#39; => TRUE, &#39;multiple&#39; => FALSE)); 
      $this->clear(); 
      return(TRUE); 
    } catch (MongoCursorException $e) { 
      $this->error("Update of data into MongoDB failed: {$e->getMessage()}", 500); 
    } 
  } 
  /**
  *
  * UPDATE_ALL  *
  *
  * Insert a new document into the passed collection *
  * @usage = $this->mongo_db->update_all(&#39;foo&#39;, $data = array());
  */ 
  public function update_all($collection = "", $data = array()) { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection selected to update", 500); 
    } if (count($data) == 0 || !is_array($data)) { 
      $this->error("Nothing to update in Mongo collection or update is not an array", 500); 
    } try { 
      $this->db->{$collection}->update($this->wheres, array(&#39;$set&#39; => $data), array(&#39;fsync&#39; => TRUE, &#39;multiple&#39; => TRUE)); 
      return(TRUE); 
    } catch (MongoCursorException $e) { 
      $this->error("Update of data into MongoDB failed: {$e->getMessage()}", 500); 
    } 
  } 
  /**
  *
  * DELETE  *
  *
  * delete document from the passed collection based upon certain criteria *
  * @usage = $this->mongo_db->delete(&#39;foo&#39;, $data = array());
  */ 
  public function delete($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection selected to delete from", 500); 
    } try { 
      $this->db->{$collection}->remove($this->wheres, array(&#39;fsync&#39; => TRUE, &#39;justOne&#39; => TRUE)); 
      $this->clear(); 
      return(TRUE); 
    } catch (MongoCursorException $e) { 
      $this->error("Delete of data into MongoDB failed: {$e->getMessage()}", 500); 
    } 
  } 
  /**
  *
  * DELETE_ALL  *
  *
  * Delete all documents from the passed collection based upon certain criteria
  *
  * @usage = $this->mongo_db->delete_all(&#39;foo&#39;, $data = array());
  */ 
  public function delete_all($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection selected to delete from", 500); 
    } try { 
      $this->db->{$collection}->remove($this->wheres, array(&#39;fsync&#39; => TRUE, &#39;justOne&#39; => FALSE)); 
      return(TRUE); 
    } catch (MongoCursorException $e) { 
      $this->error("Delete of data into MongoDB failed: {$e->getMessage()}", 500); 
    } 
  } 
  /**
  *
  * ADD_INDEX  *
  *
  * Ensure an index of the keys in a collection with optional parameters.
  To set values to descending order,
  * you must pass values of either -1, FALSE, &#39;desc&#39;, or &#39;DESC&#39;, else they will be
  * set to 1 (ASC). *
  * @usage = $this->mongo_db->add_index($collection, array(&#39;first_name&#39; => &#39;ASC&#39;, &#39;last_name&#39; => -1), array(&#39;unique&#39; => TRUE));
  */ 
  public function add_index($collection = "", $keys = array(), $options = array()) { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection specified to add index to", 500); 
    } if (emptyempty($keys) || !is_array($keys)) { 
      $this->error("Index could not be created to MongoDB Collection because no keys were specified", 500); 
    } foreach ($keys as $col => $val) { 
      if ($val == -1 || $val === FALSE || strtolower($val) == &#39;desc&#39;) { 
        $keys[$col] = -1; 
      } else { 
        $keys[$col] = 1; 
      } 
    } if ($this->db->{$collection}->ensureIndex($keys, $options) == TRUE) { 
      $this->clear(); 
      return($this); 
    } else { 
      $this->error("An error occured when trying to add an index to MongoDB Collection", 500); 
    } 
  } 
  /**
  *
  * REMOVE_INDEX   *
  *
  * Remove an index of the keys in a collection.
  To set values to descending order,
  * you must pass values of either -1, FALSE, &#39;desc&#39;, or &#39;DESC&#39;, else they will be
  * set to 1 (ASC). *
  * @usage = $this->mongo_db->remove_index($collection, array(&#39;first_name&#39; => &#39;ASC&#39;, &#39;last_name&#39; => -1));
  */ 
  public function remove_index($collection = "", $keys = array()) { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection specified to remove index from", 500); 
    } if (emptyempty($keys) || !is_array($keys)) { 
      $this->error("Index could not be removed from MongoDB Collection because no keys were specified", 500); 
    } if ($this->db->{$collection}->deleteIndex($keys, $options) == TRUE) { 
      $this->clear(); 
      return($this); 
    } else { 
      $this->error("An error occured when trying to remove an index from MongoDB Collection", 500); 
    } 
  } 
  /**
  *
  * REMOVE_ALL_INDEXES  *
  *
  * Remove all indexes from a collection. *
  * @usage = $this->mongo_db->remove_all_index($collection);
  */ 
  public function remove_all_indexes($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection specified to remove all indexes from", 500); 
    } $this->db->{$collection}->deleteIndexes(); 
    $this->clear(); 
    return($this); 
  } 
  /**
  *
  * LIST_INDEXES   *
  *
  * Lists all indexes in a collection. *
  * @usage = $this->mongo_db->list_indexes($collection);
  */ 
  public function list_indexes($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection specified to remove all indexes from", 500); 
    } return($this->db->{$collection}->getIndexInfo()); 
  } 
  /**
  *
  * DROP COLLECTION *
  *
  * Removes the specified collection from the database.
  Be careful because this
  * can have some very large issues in production!
  */ 
  public function drop_collection($collection = "") { 
    if (emptyempty($collection)) { 
      $this->error("No Mongo collection specified to drop from database", 500); 
    } $this->db->{$collection}->drop(); 
    return TRUE; 
  } 
  /**
  *
  * CLEAR  *
  *
  * Resets the class variables to default settings
  */ 
  private function clear() { 
    $this->selects = array(); 
    $this->wheres = array(); 
    $this->limit = NULL; 
    $this->offset = NULL; 
    $this->sorts = array(); 
  } 
  /**
  *
  * WHERE INITIALIZER  *
  *
  * Prepares parameters for insertion in $wheres array().
  */ 
  private function where_init($param) { 
    if (!isset($this->wheres[$param])) { 
      $this->wheres[$param] = array(); 
    } 
  } 
  public function error($str, $t) { 
    echo $str; 
    exit; 
  } 
} 
?>

Usage examples:

$table_name=trim(strtolower($this->table_name)); 
$this->mongo_db->where($where); 
$order=!emptyempty($order)?array('AID'=>'DESC'):array('AID'=>'ASC');
//升序降序 
$infos=$this->mongo_db->listinfo($table_name,$order,$page,$pagesize);

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