Котик Антон

$items = [
    'item_a' => ['require' => ['item_b']],
    'item_b' => ['require' => ['item_с']],
    'item_c' => ['require' => ['item_a']],
];

foreach (array_keys($items) as $key) {
    $items[$key]['name'] = $key;
}

uasort($items, function($a, $b) {
    return (in_array($b['name'], $a['require']) || empty($b['require']));
});

/**
 * @param array $items
 * @return bool
 */
function search_cycle($items)
{
    $search = function(array $path) use ($items, &$search)
    {
        $count = count($path);
        $first = $path[0];
        $last  = $path[$count - 1];
        if ($count > 1 && in_array($last, array_slice($path, 0, $count - 1))) {
            return true;
        }
        
        foreach ($items[$last]['require'] as $key) {
            if ($search(array_merge($path, [$key]))) {
                return true;
            }
        }
        
        return false;
    };
    
    foreach ($items as $key => $data) {
        if ($search([$key])) {
            return true;
        }
    }
    
    return false;
}

теперь нужно добавить форме еще один aciton. Чтобы email прямой вносился в базу email рассылщика.

list($a, $b) = preg_split('/(?=\/[^\/]+$)/', '/текст/текст текст/нетекст/текст');

class B extends A
{
    public function __construct()
    {
        echo 'In B';
        Prnt::__construct();
    }
}

class B extends A
{
    public function __construct() 
    {
        echo 'In B';
 
        $reflection = new ReflectionClass(self::class);
        $parent = $reflection->getParentClass();
        while ($parent->getParentClass()) {
            $parent = $parent->getParentClass();
        }
        $class = $parent->getName();
        $class::__construct();
    }
}

$n = 3;
$m = 2;
for ($i = $n; ; $i = ($i < 7 ? $i + 1 : 1)){
    echo $i . ' ';
    if ($i == $m) break;
}

$n = 3;
$m = 2;

$i = $n - 1;
do {
	$d = $i % 7 + 1;
	echo $d . ' ';
	$i++;
} while ($d != $m);

$array = [1, 2, 3, 4, 5, 6, 7];
$n = 3;
$m = 2;

$i = array_search($n, $array);
$result = array_merge(array_slice($array, $i), array_slice($array, 0, $i));

<table>
    <?php foreach (array_chunk($arr, 9) as $row): ?>
        <tr>
            <?php foreach ($row as $value): ?>
                <td><?php echo $value; ?></td>
            <?php endforeach; ?>
        </tr>
    <?php endforeach; ?>
</table>

<select name="f">  
    <option value="1,2,3">1..3</option>
    <option value="4,5,6">4..6</option>
</select>

function slugify($string) {
    $translit = "Any-Latin; NFD; [:Nonspacing Mark:] Remove; NFC; [:Punctuation:] Remove; Lower();";
    $string = transliterator_transliterate($translit, $string);
    $string = preg_replace('/[-\s]+/', '-', $string);
    return trim($string, '-');
}

echo slugify("Я люблю PHP!");

$transaction = $connection->beginTransaction();
try {
    // Этап 1
    $dbAdapter->insert($data);

    // Этап 2
    $mailAdapter->sendMessage();

    // ...

    $transaction->commit();
} catch (Exception $e) {
    $transaction->rollback();
    throw $e;
}

$date1 = "2001-01-01 15:20:20";
$date2 = "2014-11-23 21:30:00";

if (strcmp($date1, $date2) < 0) {
    // ...
}

if ($date1 < $date2) {
    // ...
}

SELECT `articles`.`id`, `articles`.`title`, GROUP_CONCAT(`tags`.`tag`)
FROM `articles`
INNER JOIN `articles_tags` ON `articles`.`id` = `articles_tags`.`article_id`
INNER JOIN `tags` ON `articles_tags`.`tag_id` = `tags`.`id`
GROUP BY `articles`.`id`;