<?php
$salt_query = "select COLUMN_DEFAULT
from INFORMATION_SCHEMA.COLUMNS
where TABLE_SCHEMA='4740648bc45207496e0e96d7a9dcdd68' and TABLE_NAME='users' and COLUMN_NAME='salt'
";
// Run query using mysqli
$salt_run = mysqli_query($mysqli, $salt_query);
$salt_row = mysqli_fetch_array($salt_run);
echo $salt = $salt_row['0'];