thinkphp automatic creation of data object parsing

Thinkphp has a Create method that automatically creates a data object, the core code is as follows

   Public Function Create ($data = ', $type = ') {      //If no value is passed by default to the post data if      (empty ($data)) {          $data   =   I (' Post. ');      } ElseIf (Is_object ($data)) {          $data   =   get_object_vars ($data);      }      Determine if there is a primary key, there is representative modification, does not represent insert      $type = $type?:(! Empty ($data [$this->GETPK ()])? self::model_update:self::model_insert);      Generate the data object, first get the field $fields of the model, filter out the fields in $data that are not in field data (the last remaining table exists in the field)      if ($this->autocheckfields) {//open field detection Filter the illegal field data          $fields =   $this->getdbfields ();          foreach ($data as $key = + $val) {              if (!in_array ($key, $fields)) {                  unset ($data [$key]);              } ElseIf (MAGIC_QUOTES_GPC && is_string ($val)) {                  $data [$key] =   stripslashes ($val);}}      }      $this->data =   $data;      return $data;   }

Where the $this->getdbfields method is as follows, the method returns an indexed array of corresponding table field names

  /**   * Get data table field information   * @access public   * @return Array */public  function Getdbfields () {      if (isset ($ this->options[' table ')) {//dynamically specify          the name $array      =   explode (', $this->options[' table ');          $fields     =   $this->db->getfields ($array [0]);          Return  $fields? Array_keys ($fields): false;      }      if ($this->fields) {          $fields     =  $this->fields;          unset ($fields [' _type '], $fields [' _pk ']);          return $fields;      }      return false;  }

$this the->db->getfields method, which returns the field details for the corresponding table

  Public Function GetFields ($tableName) {      $result =   $this->query (' SHOW COLUMNS from '. $this->parsekey ($ TableName));      $info   =   Array ();      if ($result) {          foreach ($result as $key = + $val) {              $info [$val [' Field ']] = array (                  ' name ' + =    $val [' Field '],                  ' type ' =    = $val [' type '],                  ' notnull ' = = (bool) (Strtoupper ($val [' Null ']) = = = = ' NO '),//Not Null is empty, and null is Yes                  ' default ' = = $val [' Default '],                  ' primary ' = = (Strtolower ($val [' Key ')] = = = ' pri '),                  ' autoinc ' = (strtolower ($val [' Extra ']) = = ' Auto_increment '),              );}      }      return $info;  }

thinkphp automatic creation of data object parsing