PHP syntax

What is wrong with this? This has wrecked every brain cell I have which is capable of processing PHP syntax.

$src = file_get_contents("SRC\' . $_POST["diglet"] . '.mew");

Expected output:
$src = the contents of: "SRC\" + (an integer) + ".mew"
Never mind, the answer is:

$src = file_get_contents("SRC\\" . $_POST["diglet"] . ".mew");

I needed a double slash and double quotes around each constant.
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