interleaving arrays for mysql update - php

Question

I have two arrays, one containing the field names which are imploded into a string called $fields, and one containing the data imploded into $data.
When data is first entered using the INSERT command the query looks like...
mysql_query("UPDATE table ($fields) VALUES ($data)")
(BTW: all data is sanitised)
My goal is to build a mysql UPDATE statement where the syntax is
mysql_query("UPDATE table SET $field1=$data1, $field2=$data2 ...")
and update all fields at once, so I need to combine the two arrays to build the alternating field/data/field/data structure instead of all of the fields followed by all of the data.
My idea is to use array_combine or array_merge and then implode into a string that will then set the function to
mysql_query("UPDATE table SET $imploded-combined-arrays")
I recognise that this won't work as the "glue" of the implode statement has two different values depending upon whether it is equating or separating field/data pairs.
How can I step through both arrays and build a string that is appropriate for the UPDATE syntax?
Thanks,
Cam

Answer 1

Try this
$a = array('key1', 'key2', 'key3');
$b = array('value1', 'value2', 'value3');
$c = array_combine($a, $b);
foreach($c as $key=> $value){
$result[]=$key."='". $value."'";
}
$updatefields= implode (', ', $result);
echo ("update table set " .$updatefields);
OUTPUT
update table set key1='value1', key2='value2', key3='value3'
DEMO

Answer 2

$names = array ('foo', 'bar');
$values = array ('hello', 'world');
$pairs = array ();
foreach ($names as $i => $name)
{
$value = $values [$i];
// $name = mysql_real_escape_string ($name);
// $value = mysql_real_escape_string ($value);
$pairs [] = "`$name` = '$value'";
}
echo ("UPDATE t SET " . implode (', ', $pairs));
For me outputs is:
UPDATE t SET `foo` = 'hello', `bar` = 'world'