How does phpcms remove registered email addresses?

How to remove the mailbox in phpcms registration requires that public & nbsp; function & nbsp; ps_member_register ($ username, & nbsp; $ password, & nbsp; can be registered only by submitting the user name and password; $ isemail = 0, & how does phpcms remove the registered email address?
Only the user name and password must be submitted for registration.
Public function ps_member_register ($ username, $ password, $ isemail = 0, $ regip = '', $ random = ''){
If (! $ This-> _ is_email ($ email )){
Return-3;
}

Return $ this-> _ ps_send ('register ', array ('username' => $ username, 'password' => $ password, 'regip' => $ regip, 'random '=> $ random ));
}
I can't find the position of the _ ps_send function after reading the above phpsso function to generate uid verification.


------ Solution --------------------
Does your development environment support jump directly to the function definition area?

Recursive search _ ps_send directly in the project folder is not supported