I am writing a wrapper class for MySQLi. In there, I am writing a function to accept a query and variable number of parameters where I can invoke mysqli_stmt::bind_param. Here is the code:
<?php
class DbHelper {
....
public function Execute($query, $params){
$this->open(); # Opens a connection to the database using MySQLi API
$stmt = $this->mysqli->prepare($query);
try{
$result = call_user_func_array(array($stmt, 'bind_param'), $params);
}
catch(Exception $ex){
# Handle Exception
}
}
....
}
?>
Here's how I am calling the function:
<?php
$db = new DbHelper();
$params = array('i', $stateID);
$result = $db->Execute('SELECT * FROM mst_cities WHERE State_ID = ?', $params);
?>
When I run the code, I get an warning as this:Warning: Parameter 2 to mysqli_stmt::bind_param() expected to be a reference, value given in......
What should I do?
From the docs:
Note:
Care must be taken when using mysqli_stmt_bind_param() in conjunction with call_user_func_array(). Note that mysqli_stmt_bind_param() requires parameters to be passed by reference, whereas call_user_func_array() can accept as a parameter a list of variables that can represent references or values.
There are some workarounds in the comments, for example see this:
call_user_func_array(array($stmt, 'bind_param'), refValues($params));
function refValues($arr)
{
if (strnatcmp(phpversion(),'5.3') >= 0) //Reference is required for PHP 5.3+
{
$refs = array();
foreach($arr as $key => $value)
$refs[$key] = &$arr[$key];
return $refs;
}
return $arr;
}
来源：https://stackoverflow.com/questions/12003890/cannot-use-call-user-func-array-on-mysqli-stmt-object