WQP

$els = array(
	array('id'=> 1,'chance' => 10),
	array('id'=> 2,'chance' => 15),
	array('id'=> 3,'chance' => 1),
	array('id'=> 4,'chance' => 20),
	array('id'=> 5,'chance' => 50),
);

function getItem($data) {
	$randArray = array();

	foreach ($data as $value) {
		for ($i = 0; $i < $value['chance']; $i++) { 
			$randArray[] = $value['id'];
		}
	}

	return $randArray[mt_rand(0, count($randArray) - 1)];
}

.item {
   display: flex;
   flex-direction: column;
}

.item .description {
   flex: 1;
}

$data = array(
    'Lorem',
    array(
        'Lorem',
        'ipsum',
        'dolor',
    ),
    'sit',
    'amet',
    array(
        'consectetur',
        'adipisicing',
        'elit',
        'Lorem',
    ),
);

function removeItems($data, $search) {
    foreach ($data as $key => $value) {
        if ( is_array($value) ) {
            $data[$key] = removeItems($value, $search);
        } else {
            if (strpos($value, $search) !== false) {
                unset($data[$key]);
            }
        }
    }

    return $data;
}

print_r(removeItems($data, 'Lorem'));