What do these parts of the code do?

Question

MySQL

A)

$sql = mysql_query("INSERT INTO `user` (`id`, `profesie`, `img`) 
                        VALUES (' ',' с сюрпризами ',' http ')");

b)

$sql = mysql_query("SELECT `id`, `nume`, `linkimg`, `money`, `time`, `trimite` FROM `utilizator` WHERE `id`= '$userin' ", $link);
    while ($result = mysql_fetch_array($sql)) {
        
        $name1 = $result['nume'];
    $linkimgg = $result['linkimg'];
    $moneyok = $result['money'];
    $timpul = $result['time'];
    $trimiteokk = $result['trimite'];

c)

$sql = mysql_query("SELECT `id`, `time`, `trimite` FROM `utilizator` WHERE `id`= '$utilizatorid' ", $link);
    while ($result = mysql_fetch_array($sql))

what do these pieces of code do

Answer 1

1. Inserts a record into the database.
2. Gets the data.
3. Gets the data.
No one will give you more precise explanations without the structure of the database.

Answer 2

1. Create incompatibility with PHP 7.0.x
2. B and C add potential for SQL injection