COSC 264 PHP
All variables in PHP start with which symbol?
$
What are the PHP superglobal variables?
$GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION
How do you get information from a form that is submitted using the "get" method?
$_GET[];
Which superglobal variable holds information about headers, paths, and script locations?
$_SERVER
How do you create an array in PHP?
$cars = array("Volvo", "BMW", "Toyota");
What is the correct way to add 1 to the $count variable?
$count++;
How do you create an object in PHP?
$herbie = new Car()
What is the correct way to add a comment in PHP?
/*...*/
What is the correct way to end a PHP statement?
;
What is the correct way to include the file "time.inc"?
<?php include "time.inc";?>
PHP server scripts are surrounded by delimiters, which?
<?php...?>
Which operator is used to check if two values are equal and of the same data type?
===
What is a global scope?
A variable declared outside a function
What is a local scope?
A variable declared within a function
(True/False) In PHP, the only way to output text is with echo
False
(True/False) Include files must have the file extension ".inc"
False
(True/False) When using the POST method, variables are displayed in the URL.
False
When do you use the GET method?
GET is visible to everyone and should be used for sending non-sensitive data
What are the three different variable scopes?
Local Global Static
What does PHP stand for?
PHP: Hypertext Preprocessor
When do you use the POST method?
POST is invisible to others and should be used for sending sensitive data
The PHP syntax is most similar to?
Perl and C
What is a session?
Session variables hold information about one single user, and are available to all pages in one application.
What are the data types PHP supports?
String Integer Float Boolean Array Object NULL Resource
(True/False) In PHP you can use both single quote('') and double quotes("") for strings:
True
(True/False) PHP allows you to send emails directly from a script
True
(True/False) PHP can be run on microsoft windows IIS (internet information server)
True
(True/False) The die() and exit() functions do the exact same thing
True
(True/False) the if statement is used to execute some code only if a specified condition is true
True
(True/False) variables can be declared anywhere in the script
True
What is a constant?
an identifier for a simple value. The value cannot be changed during the script
What does it mean that PHP is a loosely typed language?
because we do not have to tell PHP which data type the variable is. PHP automatically coverts the variable to the correct data type, depending on its value
$_GET
collect data sent in the URL
How do you create a constant?
define(name, value)
How do you write "Hello world" in PHP?
echo "Hello World";
What are the two ways to get an output in PHP?
echo and print
What is the correct way to open the file "time.txt" as readable?
fopen("time.txt","r");
What is the correct way to create a function in PHP?
function myFunction()
How do you create a function?
function writeMsg() { echo "Hello"; }
$_SERVER
holds information about headers, paths, and script locations
What are superglobals?
predefined variables that means they are always accessible regardless of scope
How do you start a PHP session?
session_start();
How do you create a cookie in PHP?
setcookie()
How do you create a cookie?
setcookie(name, value, expire, path, domain, secure, httponly); ex) $cookie_name = "user"; $cookie_value = "John Doe"; setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/");
How do you delete a cookie?
use the setcookie() function with an expiration date in the past
What do we use when we want the local variable NOT to be deleted?
use the static keyword when you first declare the variable ex) static $x = 0
$GLOBALS
used to access global variables anywhere in the PHP script
$_REQUEST
used to collect data after submitting an HTML form
$_POST
used to collect form data after submitting an HTML form with the post method
What is a cookie?
used to identify a user. A small file that the server embeds on the users computer and each time the same computer requests a page with a browser, it will send the cookie too.
How do you create/declare a variable in PHP?
with the $ sign followed by the name of the variable ex) $x = 5
How do you access a global variable from within a function?
with the global keyword within a function. ex) global $x
