Warning: PDOStatement::bindValue(): SQLSTATE[HY093]: Invalid parameter number: Columns/Parameters are 1-based

Question

I\'m trying to make a query function as follow :

public function Query( $sql, $params = array() ) {
        $this->error = false;

        if ( $         


        

Answer 1

 $i = 0

And

Warning: PDOStatement::bindValue(): SQLSTATE[HY093]: Invalid parameter number: Columns/Parameters are 1-based

Compare those two things, you will notice that your $i has to start at 1, not 0.

This can also be confirmed from the PHP Manual

parameter

Parameter identifier. For a prepared statement using named placeholders, this will be a parameter name of the form :name. For a prepared statement using question mark placeholders, this will be the 1-indexed position of the parameter.

Answer 2

You can also get this issue when you do something as simple as having a messed up abstraction function and you end up passing an array to the bindValue() when it should be a string, as in:

$a = array(':slug','mickey1');
$st = $PDO->prepare($sSQL);
$st->bindValue(':slug',$a); // the bug!

In my case, I should have made $a as array(':slug' => 'mickey1') and should have iterated my array so that I could bindValue() by each string key of the associative array.