CCS0043 Module 5

• $_SERVER

• $_GET

• $_POST

• $_REQUEST

• $_COOKIE

• $_SESSION

• $_ENV

Superglobal Variables

An array containing information such as headers, paths, and script locations

$_SERVER

entries were created by the web server

$_SERVER

Index 'PHP_SELF' contains the filename of the currently executing script

$_SERVER

Index '__' contains the filename of the currently executing script

PHP_SELF

An associative array variables passed to the current script via the URL parameters

$_GET

An associative array of variables passed to the current script via the HTTP POST method

$_POST

An associative array that by default contains the contents of $_GET, $_POST, and $_COOKIE

$_REQUEST

An associative array of variables passed to the current script via HTTP Cookies

$_COOKIE

An associative array containing session variables available to the script

$_SESSION

An associative array of variables passed to the current script via the environment method

$_ENV

Mechanism for storing data in the remote browser and thus tracking or identifying return users

Cookies

Small amount of information containing variable=value pair (user's computer)

Cookies

Users can refuse to accepts __

cookies

Managing cookies can be done using __ function

setcookie()

bool setcookie ( string $name [, string $value [, int

$expire = 0 [, string $path [, string $domain [, bool

$secure = false [, bool $httponly = false ]]]]]] )

syntax: setcookie()

Mechanism for storing data on the server itself

Session

The time that a user spends at your Web site

Session

More secure than cookies and can store much more information

Session

To open a session, use __ function

session_start()

Always set at the beginning of each Web page

session_start()

To close the session, use __ function

session_destroy()

Gets rid of all the session variable information that's stored in the session file

session_destroy()

The statement does not affect the variables set on the current page

session_destroy()

To unset session variables, use __ function

unset()

unset($_SESSION['varname']);

syntax: unset

Were used to efficiently search for patterns in a given text

Regular Expression

Also known as regex or regexp

Regular Expression

PHP implements __ __ __ __ (PCRE)

Percl Compatible Regular Expression

PCRE function starts with __

preg_

Performs a regular expression match

preg_match() function

int preg_match ( string $pattern , string

$subject [, array &$matches [, int $flags = 0 [, int

$offset = 0 ]]] )

syntax: preg_match()

Marks the start of a string

^

Marks the end of a string

$

Matches any single character

.

Boolean OR

|

Group elements

()

Item range (a, b or c)

[abc]

Not in range (every character except a, b, or c)

[^abc]

white-space character

\s

Zero or one 'a' character. Equals to a{0,1}

a?

Zero or more of 'a'

a*

One or more of 'a'

a+

Exactly two of 'a'

a{2}

Up to five of 'a'

a{,5}

Between five to ten of 'a'

a{5,10}

Any alpha numeric character plus underscore. Equals to [A-Za-z0-9_]

\w

Any non alpha numeric characters

\W

Any white-space character

\s

Any non white-space character

\S

Any digits. Equal to [0-9]

\d

Any non-digits. Equal to [^0-9]

\D

Ignore case

i

Multiline Mode

m

Extra analysis of pattern

S

Pattern is treated as UTF-8

u

It will match the word hello

'/hello/'

It will match hello at the start of a string. Possible matches are hello or helloworld, but not worldhello

'/^hello/'

It will match hello at the end of a string

'/hello$/'

It will match any character between he and o. Possible matches are heloor heyo, but not hello

'/he.o/'

It will match either llo or hello

'/he?llo/'

It will match hello one or more time. E.g. hello or hellohello

'/hello+/'

Matches llo, hello or hehello, but not hellooo

'/he*llo/'

It will either match the word hello or world

'/hello|world/'

Using it with the hyphen character, this pattern will match every uppercase character from A to Z. E.g. A, B, C...

'/(A-Z)/'

It will match any single character a, b or c

'/[abc]/'

Matches precisely one c character after the characters ab. E.g. matches abc, but not abcc

'/abc{1}/'

Matches one or more c character after the characters ab. E.g. matches abcor abcc

'/abc{1,}/'

Matches between two and four c character after the characters ab. E.g. matches abcc, abccc or abcccc, but not abc

'/abc{2,4}/'

<?php

function validate_email($email_address)

{

if( !preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+

([a-zA-Z0-9\._-]+)+$/", $email_address))

{

return false;

}

return true;

}

?>

Email Validation