How to calculate the Mail size using php

The following describes how to use php to calculate the Mail size. For more information about how much space your inbox occupies, see, calculate the size of each email (title + content + nearby), and then sum;
1. calculate the nearby size;
2. calculate the title and content size
3. calculate the total size of a single email.
Case:

The code is as follows:

$ Attach_size = 0;
If ($ attachmentid) {// Obtain the nearby size
$ Attach_data = attachdata ($ attachmentid );
If ($ attach_data ){
Foreach ($ attach_dataas $ value ){
$ Attach_size + = $ value ['filesize'];
}
}
}
// Obtain the title and email content size
$ Email_content_size = 0;
$ _ Filename = "attachment/emailsizecalculate. tmp ";
$ _ File = fopen ($ _ filename, "wb ");
Fwrite ($ _ file, $ subject. $ content );
Fclose ($ _ file );
If ($ _ temp = filesize ($ _ filename )){
$ Email_content_size = $ _ temp;
}
$ Del_ret = @ unlink ($ _ filename );
$ Sum_size = $ attach_size * 1024 + $ email_content_size; // total mail size
?>