What
We have done ?
PHP
Syntax
Write text
to the output using PHP
Add comments
in PHP
Keywords,
classes, functions, and user-defined functions ARE NOT case-sensitive
Variable
names ARE case-sensitive
Examples
explained
PHP
Variables
Create
different variables
Test global
scope (variable outside function)
Test local
scope (variable inside function)
Use the
global keyword to access a global variable from within a function
Use the
$GLOBALS[] array to access a global variable from within a function
Use the
static keyword to let a local variable not be deleted after execution of
function
Examples
explained
PHP
Echo and Print
Display
strings with the echo command
Display
strings and variables with the echo command
Display
strings with the print command
Display
strings and variables with the print command
Examples
explained
PHP
Data Types
PHP string
PHP integer
PHP float
PHP array
PHP object
PHP NULL
value
Examples
explained
PHP
Strings
Get the
length of a string - strlen()
Count the
number of words in a string - str_word_count()
Reverse a
string - strrev()
Search for a
specific text within a string - strpos()
Replace text
within a string - str_replace()
Examples
explained
PHP
Constants
Case-sensitive
constant name
Case-insensitive
constant name
Examples
explained
PHP
Operators
Arithmetic
operator: Addition (+)
Arithmetic
operator: Subtraction (-)
Arithmetic
operator: Multiplication (*)
Arithmetic
operator: Division (/)
Arithmetic
operator: Modulus (%)
Assignment operator:
x = y
Assignment
operator: x += y
Assignment
operator: x -= y
Assignment
operator: x *= y
Assignment
operator: x /= y
Assignment
operator: x %= y
Comparison
operator: Equal (==)
Comparison
operator: Identical (===)
Comparison
operator: Not equal (!=)
Comparison
operator: Not equal (<>)
Comparison
operator: Not identical (!==)
Comparison
operator: Greater than (>)
Comparison
operator: Less than (<)
Comparison
operator: Greater than or equal (>=)
Comparison
operator: Less than or equal (<=)
Increment
operator: ++$x
Increment
operator: $x++
Decrement
operator: --$x
Decrement
operator: $x--
Logical
operator: and
Logical
operator: or
Logical
operator: xor
Logical
operator: && (and)
Logical
operator: || (or)
Logical
operator: not
String
operator: Concatenation of $txt1 and $txt2
String
operator: Appends $txt2 to $txt1
Array
operator: Union (+)
Array
operator: Equality (==)
Array
operator: Identity (===)
Array
operator: Inequality (!=)
Array
operator: Inequality (<>)
Array
operator: Non-identity (!==)
Examples
explained
PHP
If...Else and Switch Statements
The if
statement
The
if...else statement
The
if...elseif...else statement
The switch
statement
Examples
explained
PHP
While and For Loops
The while
loop
The
do...while loop
Another
do...while loop
The for loop
The foreach
loop
Examples
explained
PHP
Functions
Create a
function
Function
with one argument
Function
with two arguments
Function
with default argument value
Function
that returns a value
Examples
explained
PHP
Arrays
Indexed arrays
count() -
Return the length of an array
Loop through
an indexed array
Associative
arrays
Loop through
an associative array
Examples
explained
PHP
Sorting Arrays
sort() -
Sort array in ascending alphabetical order
sort() -
Sort array in ascending numerical order
rsort() -
Sort array in descending alphabetical order
rsort() -
Sort array in descending numerical order
asort() -
Sort array in ascending order, according to value
ksort() -
Sort array in ascending order, according to key
arsort() -
Sort array in descending order, according to value
krsort() -
Sort array in descending order, according to key
Examples
explained
PHP
Superglobals
$GLOBAL -
Used to access global variables from anywhere in the PHP script
$_SERVER -
Holds information about headers, paths, and script locations
$_REQUEST -
Used to collect data after submitting an HTML form
$_POST -
Used to collect form data after submitting an HTML form. Also used to pass
variables
$_GET -
Collect data sent in the URL
Examples
explained
PHP
Form Validation
PHP Form
Validation
Example
explained
PHP
Multidimensional Arrays
Output
elements from a multidimensional array
Loop through
a multidimensional array
Examples
explained
PHP
Date and Time
Format
today's date in several ways
Automatically
update the copyright year on your website
Output the
current time (server time)
Set
timezone, then output current time
Create a
date and time from a number of parameters in mktime()
Create a
date and time from the strtotime() function
Create more
dates/times from strtotime()
Output the
dates for the next six Saturdays
Output the
number of days until 4th of July
Examples
explained
PHP
Include Files
Use include
to include "footer.php" in a page
Use include
to include "menu.php" in a page
Use include
to include "vars.php" in a page
Use include
to include a non-existing file
Use require
to include a non-existing file
Examples
explained
PHP
File Handling
Use
readfile() to read a file and write it to the output buffer
Examples
explained
PHP
File Open/Read/Close
Use fopen(),
fread(), and fclose() to open, read, and close a file
Use fgets()
to read a single line from a file
Use feof()
to read through a file, line by line, until end-of-file is reached
Use fgetc()
to read a single character from a file
Examples
explained
PHP
Cookies
Create and
retrieve a cookie
Modify a
cookie value
Delete a
cookie
Check if
cookies are enabled
Examples
explained
PHP
Sessions
Start a
session
Get session
variable values
Get all
session variable values
Modify a
session variable
Destroy a
session
Examples
explained
PHP
Filters
Use
filter_list() to list what the PHP filter extension offers
Sanitize a
string
Validate an
integer
Validate an
integer that is 0
Validate an
IP address
Sanitize and
validate an email address
Sanitize and
validate a URL
Examples
explained
PHP
Select Data From MySQL
Select data
with MySQLi (Object-oriented)
Select data
with MySQLi (Object-oriented) and put result in an HTML table
Select data
with MySQLi (Procedural)
Select data
with PDO (+ Prepared statements)
Examples
explained
PHP
SimpleXML Parser
Use
simplexml_load_string() to read XML data from a string
Use
simplexml_load_file() to read XML data from a file
Get node
values
Get node
values of specific elements
Get node
values - loop
Get
attribute values
Get
attribute values - loop
Examples
explained
PHP
XML Expat Parser
Initialize
an XML Expat parser, define some handlers, then parse an XML file
Examples
explained
