Contact Form?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Yogesh Dhawan: How to limit contact form phone number field according to the following:
  
  All phone numbers must begin with the digit zero. The remaining 9 characters must be 0,1,2,3,4,5,6,7,8 or 9.
  
  Are there any scripts by which we can restrict the phone number field with the above conditions?
• 
  PromozSEO: Client side or Server side? Server side language?
  By the way, this question is no way related to this community topic.
• 
  PromozSEO: Client Side/ Javascript
  
  var phone_chk=/[^0-9]/g;
  var result_phone_chk=phone_chk.test(phone);
  var phone_fst=phone.substr(0,1);
  if((result_phone_chk==true) || (phone_fst!="0"))
  {
  //Error
  }
  
  Server Side PHP
  
  $phone_fst=substr($phone,0,1);
  if((!ctype_digit($phone)) || ($phone_fst!="0"))
  {
  //Error
  }
  
  You can check this code, should work.