php - Symfony validate telephone in form field -

i have symfony 2.6 , form personal information in form field telephone, rhis

+38 (918) 280-1594 

and if developer write "_" or more digits, space. how in action check ? developer write

+38 (918) 2 801_594 

and set in db

+38(918)2801594 

what processes , decisions or bundles solve problem?

->add('telephone', null, array('label' => 'telephone', 'max_length' => 255, 'required' => false));  $builder->get('telephone')->addmodeltransformer(new callbacktransformer(     // transform <br/> \n textarea reads easier     function ($originaldescription) {         return preg_replace('/[^0-9()]+/', "", $originaldescription);     },     function ($submitteddescription) {         // remove html tags (but not br,p)         $cleaned = strip_tags($submitteddescription, '<br><br/><p>');         // transform \n real <br/>         return str_replace("\n", '<br/>', $cleaned);     } )); 

but how works? write telephone 65454### , "#" write in db wrong. why not understand? , need determine number of digits (12 digits). maybe example please.

i post +30632666$$# , in db set +30632666$$# in form visible 30632666 need in db, need set in database correct telephone , limit 13 chars - 1 "+" , 12 - digital

after installing misdphonenumberbundle, can use bundle's validator:

use doctrine\orm\mapping orm; use misd\phonenumberbundle\validator\constraints misdassert;  /**  * @orm\entity  * @orm\table  */ class entity {    // ...    /**    * @orm\column(type="string", length=50)    * @misdassert\phonenumber()    */   private $phone; }