如何使用PHP代码更新数据库表？ [关闭]

I have this following PHP that it will insert data from excel to database, but it won't update it.

Please guide me how to make it done? that If I change something, then it will update into database table rows too.

foreach($dataArr as $val){
$query = $db->query("INSERT INTO employees SET fname = '" . $db->escape($val['1']) . "', lname = '" . $db->escape($val['2']) . "', email = '" . $db->escape($val['3']) . "', phone = '" . $db->escape($val['4']) . "', company = '" . $db->escape($val['5']) . "'");
}

Thanks in advance

Not insert use update

$query = $db->query("Update employees SET fname = '" . $db->escape($val['1']) . "', lname = '" . $db->escape($val['2']) . "', email = '" . $db->escape($val['3']) . "', phone = '" . $db->escape($val['4']) . "', company = '" . $db->escape($val['5']) . "'" [WHERE where_condition]);
}

Replace

INSERT INTO employees 

with

UPDATE employees 

Update Syntax

UPDATE [LOW_PRIORITY] [IGNORE] table_references
SET col_name1={expr1|DEFAULT} [, col_name2={expr2|DEFAULT}] ...
[WHERE where_condition]