Interview Questions & Answers

Using session_id() function, the current value of the session can be found.
Syntax:
String session_id(string $id);

By the use of void set_time_limit(int seconds)
Set the number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 seconds or, if it exists, the max_execution_time value defined in the php.ini. If seconds is set to zero, no time limit is imposed.
When called, set_time_limit() restarts the timeout counter from zero. In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.

Here is how can you find the number of rows in a result set in PHP:
$result = mysql_query($any_valid_sql, $database_link);
$num_rows = mysql_num_rows($result);
echo "$num_rows rows found";

Different methods to pass data from one web page to another:
1. Store the data in a session variable. By storing the data, the data can be passed from one page to another.
2. Store data in a cookie: By storing data in a persistent cookie, data can be passed from one form to another.
3. Set the data in a hidden field and post the data using a submit button.

Using session_id() function, the current value of the session can be found.
Syntax:
String session_id(string $id)

setcookie('variable','value','time');
variable - name of the cookie variable
value - value of the cookie variable
time - expiry time
Example: setcookie('Test',$i,time()+3600);
Test - cookie variable name
$i - value of the variable 'Test'
time()+3600 - denotes that the cookie will expire after an one hour

Syntax:

A session starts by session_start() function.
This session_start() is always declared in header portion. it always declares first. then we write session_register().