What is the difference between include and require?

Include it is a part of control structure in PHP.

Include is used to evaluate or get specific file from the given path.

e.g:

include 'forloop.php'

or

include('forloop.php')

In the above example forloop.php is included in the current file.

IMP :  If the given path or file is not available . The include will show warning as an output .

Warning will not affect other code which is going to be executed after include statement

e.g

Warning: include(forloop.php) [function.include]: 
failed to open stream:

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require it is a part of control structure in PHP.

Require is used to evaluate or get specific file from the given path.

e.g:

require 'forloop.php'

or

require ('forloop.php')

In the above example forloop.php is included in the current file.

IMP :  If the given path or file is not available . The require will show fatal error as an output .

Fatal error will stop entire file execution . mean after this line none of the line will get executed

e.g

Fatal error: require(forloop.php) [function.require]: 
failed to open stream:

Note :  Its always better to use require instead of include to get proper result.