Error: "mysqli_query() expects parameter 1 to be mysqli, null given in ..."
27136
Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
58310
mysql_num_rows(): supplied argument is not a valid MySQL result resource
10844
ExecuteQuery Error When Trying to Do Anything
93041
using nulls in a mysqli prepared statement
53797
mysqli prepared statements, insert NULL using bind params
23543
Warning: mysql_query(): 3 is not a valid MySQL-Link resource
13155
How to pass parameters to query?
75465
How do I migrate my site from mysql to mysqli?
1238
mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource
24348
Single result from database using mysqli
55105
PHP MySQLi doesn't recognize login info
65929
PHP: mysql_fetch_array() expects parameter 1 to be resource, boolean given
101890
Should we ever check for mysqli_connect() errors manually?
88041
Is there a way to bind an array to mysqli prepare
255
How can I prevent SQL injection in PHP?
138362
MySQL query returning null
12286
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in