Sometimes, we want to fix Warning: mysqli_query() expects parameter 1 to be mysqli, null given in with PHP.
In this article, we’ll look at how to fix Warning: mysqli_query() expects parameter 1 to be mysqli, null given in with PHP.
How to fix Warning: mysqli_query() expects parameter 1 to be mysqli, null given in with PHP?
To fix Warning: mysqli_query() expects parameter 1 to be mysqli, null given in with PHP, we should make sure the connection object is defined.
For instance, we write
$con = mysqli_connect("localhost", "xxxx", "xxxx", "xxxxx");
function getPosts()
{
global $con;
$query = mysqli_query($con, "SELECT * FROM Blog");
while ($row = mysqli_fetch_array($query)) {
//...
}
}
to call mysql_connect with the database server URL and the credentials.
Then in the getPosts function, we make $con available with global.
This way, $con is referencing the $con variable at the top.
Conclusion
To fix Warning: mysqli_query() expects parameter 1 to be mysqli, null given in with PHP, we should make sure the connection object is defined.
