Is it necessary to close a mySQL connection [e.g. with mysqli_close()], if so WHEN and WHY?
50508
Why use mysqli_close()?
19243
Solving "MySQL server has gone away", mysql error 2006
7587
MySQL vs MySQLi when using PHP
2970
How to start and end transaction in mysqli?
17118
Warning: mysqli_query() expects at least 2 parameters, 1 given. What?
151510
Is it possible to mysqldump a subset of a database required to reproduce a query?
50979
Does SqlCommand.Dispose close the connection?
25528
Why can't I run two mysqli queries? The second one fails
40279
Mysqli_query() expects parameter 1 to be mysqli, null given? Confusing?
47099
Warning: mysql_result() expects parameter 1 to be resource, boolean given
80711
Check if db connection is closed - php
80725
Turning query errors to Exceptions in MySQLi
59177
The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead
23543
Warning: mysql_query(): 3 is not a valid MySQL-Link resource
118389
When do I have to declare session_start();?
8343
When do I use the PHP constant "PHP_EOL"?
148619
Is there a reason not to use  (null safe equals operator) in mysql instead of =?