Is PHP variable value case sensitive

A website I develop currently have a section that allows users to name things, but I don't want they give any names to anything. So I restrict words which they could use. My current code look like this:

$given_name = trim($_POST['given_name']);

$reserve = array(
        .......
        "demo" => "demo",
        "Demo" => "Demo",
        "example" => "example",
        "Example" => "Example",
        .......
);

if (in_array($given_name,$reserve)) {
        die(msg(0,"[...

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Is PHP variable value case sensitive

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