unable to connect mysql database after working long

i am not able to connect to MySQL database after working approx 5 hours on MySQL database... is this any cache problem or some type of limit

i get blank page... with static html only

$hostname_localhost = "localhost";
$database_localhost = "akhai";
$username_localhost = "root";
$password_localhost = "";
$localhost = mysql_pconnect($hostname_localhost, $username_localhost, $password_localhost) or   trigger_error(mysql_error(),E_USER_ERROR); 
mysql_sel开发者_如何学Cect_db($database_localhost);

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you can get all errors from your script by turning on error reporting (in case it isn't fatal error)

error_reporting(E_ALL);
ini_set("display_errors", 1);

It will give you your answer

you can also trigger error handler on mysql_connect();

mysql_connect("localhost", "name", "pass") or die(mysql_error());

are you sure your mysql database is up and running?

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Mysql close the connection if there is no actions for a long time . login in mysql and run: show variables like "wait_timeout"; you will see the default time.

Setting a longger time of wait_timeout or reconnect in you php when connection lost.