Php tutorials

Default Syntax

• Styles of PHP Tags
• Comments in PHP
• Output functions in PHP
• Datatypes in PHP
• Configuration Settings
• Error Types

Variables in PHP

• Variable Declarations
• Variable Scope
• PHP’s Superglobal Variables
• Variable Variables

Constants in PHP

• Magic Constants
• Standard Pre-defined Constants
• Core Pre-defined Languages
• User-defined Constants

Control Structures

• Execution Control Statements
• Conditional Statements
• Looping Statements with Real-time Examples

Functions

• Creating Functions
• Passing Arguments by Value and Reference
• Recursive Functions

Arrays

Regular Expressions

• Validating text boxes,emails,phone number,etc
• Creating custom regular expressions

Object-Oriented Programming in PHP

• Classes, Objects, Fields, Properties, _set(), Constants, Methods
• Encapsulation
• Inheritance and types
• Polymorphism
• Constructor and Destructor
• Static Class Members, Instance of Keyword, Helper Functions
• Object Cloning and Copy
• Reflections

PHP with MySQL

• Integration with MySQL
• MySQL functions
• Gmail Data Grid options
• SQL Injection
• Uploading and downloading images in Database
• Registration and Login forms with validations

Strings and Regular Expressions

• Declarations styles of String Variables
• Heredoc style
• String Functions
• Regular Expression Stntax(POSIX)
• PHP’s Regular Expression Functions(POSIX Extended)

Working with the Files and Operating System

• File Functions
• Open, Create and Delete files
• Create Directories and Manipulate them
• Information about Hard Disk
• Directory Functions
• Calculating File, Directory and Disk Sizes

Error and Exception Handling

• Error Logging
• Configuration Directives
• PHP’s Exception Class
• Throw New Exception
• Custom Exceptions

Authentication

• HTTP Authentication
• PHP Authentication
• Authentication Methodologies

Cookies & sessions

• Types of Cookies
• How to Create and Access Cookies

• Session Variables
• Creating and Destroying a Session
• Retrieving and Setting the Session ID
• Encoding and Decoding Session Data
• Auto-Login
• Recently Viewed Document Index

Web Services

• RSS Syntax
• SOAP
• How to Access Web Services

XML Integration

• Create a XML file from PHP with Database records
• Reading Information from XML File

MySQL Concepts

• Storage Engines
• Functions
• Operators
• Constraints
• DDL commands
• DML Commands
• DCL Command
• TCL Commands
• Views
• Joins
• Cursors
• Indexing
• Stored Procedures
• Mysql with PHP Programming
• Mysql with Sqlserver(Optional)

 

PHP Global variables:

Get & Post methods:

data can be sent to Body no one can see the data. (secure and mostly used).

 

$_POST[]: both post and get variables extracts the form fields into variables and values

$_GET[]:   used send data via URL or http header. (security issues anyone can see the data)

$_REQUEST[]: it accepts both get and post method in form fields.

<form method=”POST” action=”action.php” name=return false validate()/>

Name: input type=”text” name=”name”/>

email: input type=”text” name=”email”/>

Mobile: Input type=”text” name=”mobile” />

Password: input tyepe=”text” name=”password”/>

<input type=”submit” value=”display text” />

</form>

in the above Name values (name,email,mobile,passwords)  treats as Variables. and user entered inputs are treats as values.

this can be extracted by extract(S_Post[form])

Onclick form we hae set return false to validate details by cilentside scripts like js,jquery etc

 

server-side validation:

 

isset(): to know it contains value or not

empty() to check variable null or not.

 

Query strings:  also known as “?”, using this we can pass keys and values via URL.  using get method.

 

 

 

 

Connecting database 

 

$dbconnection= Mysqli_connect(“localhost or remote”,”dbuser”,”password or empty”, “databasename”)

// Checking connection
if (!dbconnection) {
die(“Notconnect ” . mysqli_connect_error());  //here conactinating stings with mysql error fucntion to display errors.
}

 

mysqli_select_db(“databasename”)

• Warning: mysqli_select_db() expects exactly 2 parameters, 1 given

Error mysqli_select_db() should have 2 parameters, the connection link and the database name –

mysqli_select_db($dbconnection, ‘databaename‘) or die(mysqli_error($con));

Mysqli_query 

• error :Warning: mysqli_query() expects at least 2 parameters, 1 given

$query = mysqli_query($dbconnection, “SQL query“);

 

 

Mysqli vs MySQL_connect”

 

mysqli is improved version of MySQL available from PHP 7. MySQL extension works up to PHP 5.6.

 

INSET query:

“Inset into table name (column1, column2, column3,) values (val1, val2, val3)”;

 

Arrays:

Associative array:  in the form keys and value

ex: $form = array(“name”=>”alebert”, “email”=>”g@gmail.com”, “mobile”=>”000000000”);

Index array:  $values = array(“1”, “2”, “3”);

$values[0] = “1”;
$values[1] = “2”;
$values[2] = “3”;

Multidimensional array: 

 

 

WordPress & Php 7 compatibility and issues

Please Upgrade php5.6 to PHP 7.1 which uses less ram and faster performance.

RAM consume different 40MB with PHP 5.6 and php7.xx using 4-10GB ram hard. all themes and WordPress core also compatible with PHP 7 upgrade and save resources billing. also, give better speed for the user.

 

diffrence among =, ===, and ===.

x = 1 //x now equals 1
true == 1 //does the boolean value of true equal 1? (True) //not strict
true === 1 //does the boolean value of true equal 1? (False) //strict

 

Object Oriented PHP