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<?php function ReformatPhoneNumber($number){ if( !preg_match('/^[0-9][0-9\- ]+[0-9]$/', $number) || // (strlen($number) > 12) || // (strlen($number) < 7) || (preg_match_all('/[0-9]/', $number) > 12 ) || (preg_match_all('/[0-9]/', $number) < 7 ) || (preg_match('/[ \-]{2,}/', $number)) ){ throw new \Exception('Invalid phone number'); } return trim(preg_replace('/[^0-9]/','',$number)); } echo ReformatPhoneNumber('012-345 69') ."\n"; foreach(array('012345', '-012345 678', '01203- 34566', '123456678875432','1234x567','1234567890123') as $invalid){ try { ReformatPhoneNumber($invalid); }catch(\Exception $e){ continue; } echo "ACCEPTED $invalid !!!!!!!!\n"; }