Collection of useful PHP functions and code snippets.
function identity(mixed $arg): mixed {
    return $arg;
}
$interpolate = "identity";
echo "<input value='{$interpolate(1 + 1 * random_int())}' />";See Casting.php
/**
 * Checks if a folder exist and return canonicalized absolute pathname (sort version)
 * @param string $folder the path being checked.
 * @return mixed returns the canonicalized absolute pathname on success otherwise FALSE is returned
 */
function folder_exist(string $folder): string|false
{
    // Get canonicalized absolute pathname
    $path = realpath($folder);
    // If it exist, check if it's a directory
    return ($path !== false AND is_dir($path)) ? $path : false;
}See JSON2Class.php
