Illuminate\Database\Query\Builder::insertGetId PHP Method

    public function insertGetId(array $values, $sequence = null)
    {
        $sql = $this->grammar->compileInsertGetId($this, $values, $sequence);
        $values = $this->cleanBindings($values);
        return $this->processor->processInsertGetId($this, $sql, $values, $sequence);
    }

 /**
  * 插入记录
  * @param array $obj
  * @return bool|array 成功返回带id的对象，否则返回false
  */
 function insert($obj)
 {
     $retId = $this->operator->insertGetId($obj);
     if ($retId) {
         $obj[$this->pkey] = $retId;
     }
     return $obj;
 }