PHP is a scripting language designed specifically for use on the web. It has features to aid you in programming the tasks needed to develop dynamic web applications. This table provides a brief overview of some of the statements you'll use frequently:

Statement Description
array ( "key" => "value", . . . ); Casts a key and value as an array.
die("message"); Stops processing and displays the message.
do { block } while (condition); Performs an operation once and then while a condition is still true.
echo item; Displays item.
for (startingval; endingval;increment) { block } Begins a loop while startingval is less than endingval.
foreach( $array as $key => $value) { block } Begins a loop through an array.
function funcname(value,value,. . .) { block } Declares a function.
header("Location: URL"); Sends an HTTP header.
if (condition) { block } Begins a conditional block.
elseif (condition) { block } Provides an alternate test in a conditional block.
else { block } Provides a final alternative in a conditional block.
session_start(); Starts or resumes a session.
session_destroy(); Destroys a session (but doesn't necessarily clear it completely.)
unset(); Destroys a variable.
while (condition) { block } Creates a loop while a condition is met.