updating multiple rows in sql in a loop - php

Question

i have multiple input-fields with the same name as id's and the other fields with other names like
<input name="id[]" value="1" /> <input name="st[]" value="4" />
<input name="id[]" value="5" /> <input name="st[]" value="57" />
<input name="id[]" value="79" /> <input name="st[]" value="43" />
.
.
.
in my sql table i want to change ...maybe id->3 and id->87 or whatever 10 others to update the column "st" with the value from the right side input field. The key values from id and st are the same.
I know the update-sql-syntax of one row. but, if i want more rows i dont know what to do
my reasoning was do it with Jquery Ajax or php Implode like
$id = implode(',', $_POST['id']);
$st = implode(',', $_POST['st']);
$sql = "UPDATE table SET st=('$st') WHERE id=('$id')";
then i found this from user peterm
UPDATE table
SET st = CASE id
WHEN 'id_x' THEN 'st_x'
WHEN 'id_y' THEN 'st_y'
...
ELSE st
END
WHERE id IN('id_x', 'id_y', ...);
How do i get it with spontaneously entrys from my website-user in a loop (foreach?)

Answer 1

I hope it can resolve your problem. You can use the code as below :
if(!isset($_POST['id'] || count($_POST['id']) == 0){
return;
}
foreach($_POST['id'] as $key => $id)){
$sql = "UPDATE table SET st='{$_POST['st'][$key]}' WHERE id='{$id}'";
}

Answer 2

$SizeOfID=sizeof($id);
for($i=0;$i<$SizeOfID;$i++)
{
$IDvalue=$id[$i];
$STvalue=$st[$i];
mysql_query("UPDATE table SET st='$STvalue' WHERE id='$IDvalue'");
}

Answer 3

There is also another quicker way to accomplish it without executing multiple sql because of the loop.
But you must make sure that the query will be constructed in a way that it will "hit" on existing unique key ( for example the primary ) and so it will use the sql's ON DUPLICATE KEY to update its VALUES...
For example:
<?php
$values = [];
foreach( $data as $id => $value ){
$values[] = "( '".$id."', '".$value."' )";
}
if( (bool)$values ){
$sql = "INSERT INTO table ( id, st ) VALUES".implode(',',$values)." ON DUPLICATE KEY UPDATE st = VALUES(st)";
//execute $sql here
}
Of course you need to validate - sanitize data... the usual stuff...