PHP

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  how can we connect more than one database into  webpage..

  Whst is the difference between include_once() and include() ?

  How session will work when we disable cookies of client browser?

Session is kind of cookie who is work on server side.For working of session on server side cookies should be enable on server side and also on client side browser.

But session will also work when cookies are disable on client side by using URL session passing.

  How we use array_search() in PHP?

When we use array_search() function if it found the particular value than it will return index corresponding to array value.
Example:
$Emp_name_array= array(0 => 'vivek', 1 => 'umang', 2 => 'shrish', 3 => 'jalees');
$key = array_search('umang', $Emp_name_array); // return $key = 1; 
$key = array_search('vivek', $Emp_name_array);  // return $key = 0;
 ?>