pathChecker.php

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<?php
if (isset($_GET['path'])) {
    $path = urldecode($_GET['path']);

    if (file_exists('../../../../' . $path)) {
        echo 'path exists: true';
    } else {
        echo 'path exists: false';
    }
} else {
    throw new \InvalidArgumentException("GET parameter 'path' is not set.");
}