PHP PDO bindParam was falling in a foreach

Question

I had a loop like that :

foreach($Fields as $Name => $Value){
    $Query->bindParam(\':\'.$Name, $Value, PDO::PARAM_STR);
}

Nothing c

Answer 1

If you don't need the ability to keep the variable in sync with the bound parameter before the query is executed (which is the case 99.9% of the time, in my experience), it's probably better to simply use PDOStatement::bindValue() instead of PDOStatement::bindParam():

foreach ($Fields as $Name => $Value) {
    $Query->bindValue(':' . $Name, $Value, PDO::PARAM_STR);
}

Answer 2

However, thanks to this guys. I found out that you need to pass the value by reference with a & before like that :

foreach($Fields as $Name => &$Value){
    $Query->bindParam(':'.$Name, $Value, PDO::PARAM_STR);
}

This was driving me nuts.

Actual quote from PHP.net :

Vili 28-May-2010 12:01

This works ($val by reference):

<?php
foreach ($params as $key => &$val){
    $sth->bindParam($key, $val);
}
?>

This will fail ($val by value, because bindParam needs &$variable):

<?php
foreach ($params as $key => $val) {
    $sth->bindParam($key, $val);
}
?>

Answer 3

There is one more nasty option to get rid of this issue.

You can simply iterate through the array keys, and get each value as a parameter by using these keys:

foreach(array_keys($params) as $key) {
    $sth->bindParam($key, $params[$key]);
}