PHP has many built-in language constructs and functions. Language constructs can be used with or without parentheses while functions always have parentheses. Here is an example using a language construct. With brackets: require_once(‘filename.php’) Without Brackets: require_once ‘filename.php’
Printing strings and variables
echo()
print()
Unsetting a session variable
unset()
Check is a variable is set
isset()
Check if post variable is empty
empty()
Check if post variable is not empty
!empty
Include files:
include()
include_once()
require()
require_once()
End the php script
die() or die
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