PHP implements ID auto-increment and specifies the number of digits

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In the development process We often encounter such folding requirements:

ID value is self-increasing and the length is 7 digits. If there are not enough, use 0 to fill in front.

Special implementation:

mysql

id char(7) not null default '0000000';

php set public method

/** * @param $id * @return string|void */
protected function isNumAuto($id)
{    
if (strlen($id) > 7) {        
$this->_json['msg'] = 'ID大于7位,不符合要求';       
return self::alertJson($this->_json);    
}   
 if (strlen($id) < 7) {       
  $newid = sprintf("%07d", intval($id) + 1);        
  if (strlen($newid) <= 7) {            
  return $newid;        
  } else {           
  $this->_json[&#39;msg&#39;] = &#39;ID大于7位,不符合要求&#39;;           
   return self::alertJson($this->_json);        
   }    
   }
   }

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