Integrating PHP with Embedded System

Contents

What is PHP?..........................................................................................................................................6

Basic PHP Syntax .................................................................................................................................6

Hello World example ..........................................................................................................................6

Error Management................................................................................................................................8

Finding errors present in the program ...............................................................................................9

Comments in PHP................................................................................................................................12

PHP is a Loosely Typed Language......................................................................................................12

PHP Variables Example.......................................................................................................................12

Global and locally-scoped variables...................................................................................................13

Example for Global and locally-scoped variables .............................................................................13

Static Keyword in PHP ........................................................................................................................14

Static Keyword Example....................................................................................................................14

ECHO and PRINT statements in PHP .................................................................................................15

PRINT Statement Example in PHP.....................................................................................................15

String Functions in PHP......................................................................................................................16

1. strlen() function ........................................................................................................................16

2. strpos() function........................................................................................................................16

Constant in PHP...................................................................................................................................17

Constant string Example ...................................................................................................................17

PHP Example to calculate the area of the circle ...............................................................................17

Arithmetic Operators ..........................................................................................................................18

Arithmetic Operators Example .........................................................................................................19

Increment and Decrement Operators................................................................................................20

Increment and Decrement Operators Example................................................................................20

Assignment Operators in PHP............................................................................................................21

Assignment Operators Example........................................................................................................21

String Operators in PHP......................................................................................................................23

String Operators Example .................................................................................................................23

The if Statement in PHP......................................................................................................................24

The if Statement Example.................................................................................................................24

The if…else Statement in PHP ............................................................................................................25

The if…else Statement Example........................................................................................................25

The if…elseif…else Statement in PHP ................................................................................................26

The if…elseif…else Statement Example (Comparing two numbers) ................................................. 26

Switch Statement in PHP .................................................................................................................... 27

Switch Statement Example ............................................................................................................... 27

For loop in PHP .................................................................................................................................... 28

For loop Example .............................................................................................................................. 28

Declaring multiple variables in for loop Example .............................................................................29

While Loop in PHP ............................................................................................................................... 30

While Loop Example ......................................................................................................................... 30

Do While loop in PHP .......................................................................................................................... 31

Do While loop Example ..................................................................................................................... 31

User Defined Function Example ........................................................................................................ 32

Swap Numbers PHP Example ............................................................................................................. 33

PHP Functions - Adding parameters .................................................................................................. 34

PHP Functions - Return values ........................................................................................................... 35

Break statement .................................................................................................................................. 35

Break statement example ................................................................................................................. 35

Continue statement ............................................................................................................................. 36

Continue statement example ........................................................................................................... 36

PHP Global Variables - Superglobals ................................................................................................. 36

$GLOBALS .......................................................................................................................................... 37

Example: ............................................................................................................................................ 37

$_SERVER .......................................................................................................................................... 38

Example ............................................................................................................................................. 38

Array in PHP .......................................................................................................................................... 39

Numeric Array in PHP ....................................................................................................................... 39

Numeric Array Example .................................................................................................................... 39

Associative array in PHP ........................................................................................................................ 40

Associative array Example ................................................................................................................ 40

Loop through an Associative Array ....................................................................................................... 41

Multidimensional array in PHP ............................................................................................................. 42

Multidimensional array Example ...................................................................................................... 42

PHP Forms ............................................................................................................................................. 43

The $_GET Function .......................................................................................................................... 43

The $_POST Function ........................................................................................................................ 43

The $_GET Function Example ........................................................................................................... 44

The $_ POST Function Example ........................................................................................................ 46

Another Example for PHP form ......................................................................................................... 48

Date() and time() function in PHP ......................................................................................................... 51

Example ............................................................................................................................................. 51

How to connect to MYSQL database using PHP ................................................................................... 52

The functions used to connect web form to the MYSQL database: ..................................................... 60

Display the data from MYSQL database in web form ........................................................................... 61

Insert the data into MYSQL database using web form ......................................................................... 63

Update the data present in MYSQL database using web form ............................................................. 66

Delete the data from MYSQL database using web form ...................................................................... 70

Hosting your domain using cPanel ........................................................................................................ 74

EMBEDDED SYSTEM WITH PHP ............................................................................................................ 86

OVERVIEW ......................................................................................................................................... 86

FEATURES .......................................................................................................................................... 86

APPLICATION DIAGRAM .................................................................................................................... 86

CIRCUIT DIAGRAM ............................................................................................................................ 87

PIN CONNECTION .............................................................................................................................. 88

INTERFACE ......................................................................................................................................... 89

LIBRARY ............................................................................................................................................. 89

CODE ................................................................................................................................................. 90

 With Arduino ............................................................................................................................. 90

1. ADD hello world example from Examples ................................................................................ 90

2. Add Server Reading Example .................................................................................................... 90

3. relay interface(Web Remote) ................................................................................................... 91

.............................................................................................................................................................. 91

code:.................................................................................................................................................. 91

PIN CONNECTION .............................................................................................................................. 95

WITH ETHERNET MODULE ................................................................................................................ 95

WITH RELAY....................................................................................................................................... 96

CODE ................................................................................................................................................. 98

PHP CODE: ....................................................................................................................................... 102

PIN CONNECTION ............................................................................................................................ 106

code ................................................................................................................................................. 107