PHP snippets

helpers.php

<?

// return true if callback is true for every element,
// false if the first element is false
// _every :: [a] -> (a -> bool) -> bool
function _every($arr, $callback) {
    foreach ($arr as $value) {
        if ($callback($value) === false) {
            return false;
        }
    }
    return true;
}

// return true if callback is true for the first element,
// false if every element is false
// _any :: [a] -> (a -> bool) -> bool
function _any($arr, $callback) {
    foreach ($arr as $value) {
        if ($callback($value) === true) {
            return true;
        }
    }
    return false;
}

function safeDeref($array, $key, $fallback) {
    $_array = (array) $array;
    $_key = gettype($key) === 'string' ? $key : '';
    return array_key_exists($key, $_array)
        ? $_array[$key]
        : $fallback;
}

// _flatMap :: [a] -> (a -> [b]) -> [b]
function _flatMap($arr, callable $fn) {
    return array_merge([], ...array_map($fn, $arr));
}

// flatMap preserving key for associate arrays
// _flatMapK :: [v] -> (k -> v -> [w]) -> [w]
function _flatMapK($arr, callable $fn) {
    return array_merge([], ...array_map($fn, array_keys($arr), $arr));
}

// _map :: [a] -> (a -> b) -> [b]
function _map($arr, callable $fn) {
    return array_map($fn, $arr);
}

// map preserving key for associate arrays
// _mapK :: [v] -> (k -> v -> w) -> [w]
function _mapK($arr, callable $fn) {
    return array_map($fn, array_keys($arr), $arr);
}

// trim down objects based on selected keys
// [v] -> [w]
function _selectArr(array $arr, $selectKeys) {
    return array_map(function ($obj) use ($selectKeys) {
        $ret = [];
        foreach ($selectKeys as $k) {
            $ret[$k] = $obj->$k ?? [];
        }
        return $ret;
    }, $arr);
}

// _filter :: [a] -> (a -> bool) -> [a]
function _filter(array $arr, callable $fn) {
    return array_filter($arr, $fn);
}

// filter preserving keys for associate array
// _filterK :: [v] -> (k -> v -> bool) -> [v]
function _filterK(array $arr, callable $fn) {
    return array_filter($arr, $fn, ARRAY_FILTER_USE_BOTH);
}

// filter squeeze the array, i.e. 0 1 2 3 ... instead of 2 4 7 ...
// _filterShrink :: [a] -> (a -> bool) -> [a]
function _filterShrink(array $arr, callable $fn) {
    return array_values(array_filter($arr, $fn));
}

// _reduce :: [a] -> b -> (b -> a -> b) -> [b]
function _reduce(array $arr, $init, callable $fn) {
    return array_reduce($arr, $fn, $init);
}

// nullable first item
// _nhead :: [a] -> nullable a
function _nhead(array $a) {
    if (empty($a)) return null;
    return array_values($a)[0];
}

function findUser($qs) {
    $us = \App\User::where('name', $qs)
        ->orWhere('email', $qs)->get();

    if (! $us) $us = \App\User::where('name', 'like', "%$qs%")
        ->orWhere('email', 'like', "%$qs%")->get();

    if (! $us) return "";
    $u = _nhead($us);
    if (! $u) return "";
    if (count($us->all()) > 1) return $us;
    return JWTAuth::fromUser($u);
}

JWTCustomPayload.php

<?

$claims = [
    'exp' => JWTFactory::getTTL(),
    'a' => $a,
    'b' => $b,
    'now' => \Carbon\Carbon::now()->toDateTimeString(),
];
$factory = JWTFactory::customClaims($claims);
$payload = $factory->make();
$verifyToken = JWTAuth::encode($payload);
$tokenString = $verifyToken->get();


// == verify token & check exp == //
try {
    $payload = JWTAuth::getPayload($token);
    if (Utils::timestamp($payload['exp'])->isPast()) {
        // 401 response
        return false;
    }
} catch (JWTException $e) {
    // 401 response;
    return false;
}
// safely use $payload