使用其中一列作为数组键获取的数组 - 获取错误消息“unexpected T_DOUBLE_ARROW”

Question

我正在尝试使用其中一个作为数组键提取的列创建数组，但我收到错误消息unexpected T_DOUBLE_ARROW

$students = array();
foreach ($rows as $row) { 
    $students[$row['first_name']] => $row['last_name'];
}

Answer 1

=>应替换为=

$students[$row['first_name']] = $row['last_name'];

Answer 2

$students = array();
foreach ($rows as $row) { 
    $students=array($row['first_name'] => $row['last_name']);
}