PHP again - String concatenation

How can I concatenate two variables as strings? For example,

PHP Code:

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$a = "asdf";
$b = "ghjk";
fwrite($theFile, ???); //want to have asdfghjk 


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you can try" join($a,$b) "

actually that would be

PHP Code:

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$a = "asdf";
$b = "ghjk";
$c = join("",$a$b)
fwrite($theFile, $c); //want to have asdfghjk 


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I think that would work since I didn't see any other function that would do it besides implode(), which is the same.

That can be simplified:

Code:

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$a = "Hello ";
$b = "World";
$c = $a . $c;
//or
$a = "Hello";
$b = "World";
$c = "$a $b";

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I was thinking that but wasn't sure if that would work, :p

Cool, thanks guys :)