Приветствую)
Имеется два массива

$countEmail = count($this->emails);
$countLink = count($this->link);

for($e = 0, $l = 0;  $l < $countLink, $e < $countEmail; $e++, $l++) {
	echo $this->emails[$e]['login'].'@'.$this->emails[$e]['domain'].';'.$this->link[$l]['link'].PHP_EOL.'<br/>';
	
}

Выводится в браузер

test@mail.ru;http://seit.ru
test2@mail.ru;http://seit2.ru
test3@mail.ru;
test4@mail.ru;

Естественно возникают ошибка вида "Notice: Undefined offset:".
Можно ошибки заглушить поставив @, echo @$this->emails[$e]['login'].'@'.@$this->emails[$e]['domain'].';'.@$this->link[$l]['link'].PHP_EOL.'<br/>';
но говорят это плохой тон. Вот подскажите как прогнать два массива?

Проверяйте через isset() ,
Рекомендую обьеденить массивы чем делать куча разных

Слил два массива в один

$array = array_merge($this->emails, $this->link);

получаем такой массив

 Array
(
    [0] => Array
        (
            [id] => 111
            [project] => 10
            [userid] => 1
            [login] => atrus-kons
            [domain] => mail.ru
            [send] => 0
            [fio] => 
        )

    [1] => Array
        (
            [id] => 112
            [project] => 10
            [userid] => 1
            [login] => teros70
            [domain] => mail.ru
            [send] => 0
            [fio] => 
        )

    [2] => Array
        (
            [id] => 113
            [project] => 10
            [userid] => 1
            [login] => murakhtanov
            [domain] => mail.ru
            [send] => 0
            [fio] => 
        )

    [3] => Array
        (
            [id] => 114
            [project] => 10
            [userid] => 1
            [login] => terffmof00r
            [domain] => mail.ru
            [send] => 0
            [fio] => 
        )

    [4] => Array
        (
            [id] => 115
            [project] => 10
            [userid] => 1
            [login] => lenfa-6f3_09
            [domain] => bk.ru
            [send] => 0
            [fio] => 
        )

    [5] => Array
        (
            [id] => 116
            [project] => 10
            [userid] => 1
            [login] => permydfakova_o_a
            [domain] => mail.ru
            [send] => 0
            [fio] => 
        )

    [6] => Array
        (
            [id] => 119
            [project] => 10
            [userid] => 1
            [login] => sergd_popov
            [domain] => mail.ru
            [send] => 0
            [fio] => 
        )

    
    [7] => Array
        (
            [id] => 23
            [link] => http://seit.ru/
            [user] => 1
            [projectid] => 10
            [send] => 0
        )

    [8] => Array
        (
            [id] => 24
            [link] => https://seit2.net/
            [user] => 1
            [projectid] => 10
            [send] => 0
        )

    [9] => Array
        (
            [id] => 25
            [link] => http://www.forum.xset.org/
            [user] => 1
            [projectid] => 10
            [send] => 0
        )

)

foreach($array as $value) {
	/**
	 Не знаю как тут обработать, чтобы получить вывод
	 email;link
	 email;link
         email; возможно будет пусто
	 email; пусто
	 **/
	 if(isset($value['link']) && isset($value['login])) {
	 // Как?!
	 }
	 
	
}