I had a case to use bind parameter of PDO statement inside loop. This was code that I used

[php] foreach ($this->data as $key => $value) { $st->bindParam(':' . $key, $value); } $st->execute(); [/php]

I executed this code and got surprising result, it didn't work. Apparently, PDO statement use $value with last looping value. I took a look at PHPDoc for bindParam() and found why this could be happened.

...The variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

bindParam() use reference not real value. In order to solve this, we can add & to $value, so it becomes

[php] foreach ($this->data as $key => &$value) { // add & $st->bindParam(':' . $key, $value); } $st->execute(); [/php]

or alternative solution is using bindValue(), then the code become

[php] foreach ($this->data as $key => $value) { $st->bindValue(':' . $key, $value); // change to bindValue() } $st->execute(); [/php]

Hope it helps :)