What We have done ?

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

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