What is the different between “$headers” and “$headers .”?

Question

I am new PHP student.
Yesterday, I got this in a script .
The different between both is just in “.” at the end.
Can anyone tell me what the efferent between them is?
$headers = "From: [e-mail]\r\n";
$headers .= "BCC: [e-mail]\r\n";
Thanks

Answer 1

The operator = assigns the strings.

The operator .= combines the original string with a new string.



so:

x.=y

is really just:

x=x.y



The operator . is used to combine strings.



"abc"."def" = "abcdef"



in your case:



$headers = "From: [e-mail]\r\nBCC: [e-mail]\r\n";

Answer 2

The one with the period will append it to the existing value of $headers

Answer 3

= is assignment, .= is concatenation



a = "one"



so a is "one"



a.= "two"



so now a is "onetwo"