Update Multiple Rows at once MySQL - php

Question

I have a table which includes a row for each day of the week.
Each row contains 2 input fields.
I am wanting to click one save button which will update all rows from the table into seperate MySQL rows.
I have the below code to insert new rows (which works fine) but wondering how this can be changed to an UPDATE statement?
$insertArr = array();
for ($i=0; $i<$cnt; $i++) {
$insertArr[] = "('"
. mysql_real_escape_string($_GET['Actual'][$i]) .
"', '"
. mysql_real_escape_string($_GET['Period'][$i]) .
"', '"
. mysql_real_escape_string($_GET['AddedBy'][$i]) .
"', '"
. mysql_real_escape_string($_GET['Date'][$i]) .
"', '"
. mysql_real_escape_string($_GET['Employee'][$i]) .
"', '"
. mysql_real_escape_string($_GET['Rotered'][$i]) . "')";
}
$query = "INSERT INTO hr_employee_rostered_hours (Actual, PeriodID, AddedBy, DateOfHours, EmployeeUniqueID, Rotered) VALUES " . implode(", ", $insertArr);
mysql_query($query) or trigger_error("Insert failed: " . mysql_error());
}

Answer 1

The mysql extension has been deprecated in PHP, and I strongly advice against using it.
Assuming that you're still getting the values that you want to update using the array,
Here is a link about PDO (not official docummentation) that helped me out when I first started with PHP and PDO
Here's an example using PDO
$updateq = "UPDATE hr_employee_rostered_hours SET (Actual = :actualvalue, PeriodID = :periodid, AddedBy = :addedby,DateOfHours = :dateofhrs, Rotered = :rotered ) WHERE EmployeeUniqueID = :employeeid";
$updatex = $dbh->prepare($updateq);
$updatex->bindValue(":actualvalue",$insertArr[0]);
$updatex->bindValue(":periodid",$insertArr[1]);
$updatex->bindValue(":addedby",$insertArr[2]);
$updatex->bindValue(":dateofhrs",$insertArr[3]);
$updatex->bindValue(":periodid",$insertArr[5]);
$updatex->bindValue(":employeeid",$insertArr[4]);
$updatex->execute();

Answer 2

You can use this code to update in MySQL.
for ($i = 0; $i < count($insertArr); $i++){
$var_to_update = implode(", ", $insertArr[$i]);
$actual = $var_to_update[0];
$periodID = $var_to_update[1];
$addedby = $var_to_update[2];
$dateofhour = $var_to_update[3];
$employeeUniqueID = $var_to_update[4];
$rotered = $var_to_update[5];
$query = "UPDATE hr_employee_rostered_hours SET (Actual = $actual , PeriodID = $periodID, AddedBy = $addedby, DateOfHours = $dateofhour, EmployeeUniqueID = $employeeUniqueID, Rotered = $rotered) WHERE EmployeeUniqueID = $employeeUniqueID";
$result = mysql_query($sql);
if ($result === FALSE)
{
die(mysql_error());
}
}