PHP

What is PHP?

The acronym PHP initially stood for Personal Home Page.

As of version 3, it stands for PHP Hypertext Preprocessor. It is a general purpose server side scripting language that is used to develop:

Dynamic Websites

Custom Web Portal (Like ERP, CRM)

Web Applications

E-commerce Websites (Like Flipkart, Amazon, Paytm, Snapdeal etc)

CMS – Content Management System

Importance of PHP?

It costs low with cost effective database applications

It is platform independent

PHP supports all major web servers

The existence of multiple security layers make PHP one of the most secure options for developing the most critical websites and web applications.

PHP supports a wide array of databases including dataBase, MySQL etc.

History of PHP

Designed by Rasmus Lerdorf

Developer The PHP Development Team, Zend Technologies

First appeared June 8, 1995; 21 years ago

Stable release 7.1.0/ December 1, 2016

Basic Structure of PHP
<?php
//your code here
?>
Example:
<!doctype html>
 <html>
 <head><title>Hello World Script</title></head>
  <body>
  <?php
     echo "<p>Hello World!</p>";
   ?>
  </body>
 </html>
Printing statement in PHP

If you want to print/echo some string/variable or number in php
<?php 

$variable = "your string"; //

echo $variable; //

?>
File Extension of PHP
PHP files have the file extension .php
Comment Line in PHP

Single Line Comments

Single line comments start with //.

Any text between // and the end of the line will be ignored by PHP(will not be executed).

Example
echo 'This is a test'; // This is a one-line c++ style comment
Multi-line Comments

Multi-line comments start with /* and end with */.

Any text between /* and */ will be ignored by PHP.

Example
/* This is a multi line comment

          yet another line of comment */

/*  echo 'This is yet another test';

     echo 'Hi'; */

    echo 'One Final Test'; # This is a one-line shell-style comment
Variable Declaration

In PHP, a variable starts with the $ sign, followed by the name of the variable:

Example
<?php

$Vraiable_name = "Hello world!";

$x = 5;

$y = 10.5;

?>
A variable can have a short name (like x and y) or a more descriptive name (age, car name, total_volume).

Rules for PHP variables:

A variable starts with the $ sign, followed by the name of the variable

A variable name must start with a letter or the underscore character

A variable name cannot start with a number

A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

Variable names are case-sensitive ($age and $AGE are two different variables)

Pampers Premium Care Pant Style Baby Diapers | Medium (M size) | 54 Count | Voted India's Softest | All-in-1 with 360 Cottony Softness Diapers | 7-12kg

₹780.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Mother Sparsh 99% Pure Water (Unscented) Baby Wipes with Lid I Natural Plant made cloth - Super thick Wet Wipes I 72 pcs/pack - Pack of 2 (Super Saver Pack)

₹331.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Little's Premium Baby Diapers XL Size (Extra Large) Pants Style | 12-17 kg | 54 Count | Super Jumbo FluffySoft Baby Diaper with Leakage Guard, Wetness Indicator & 12 Hours Absorption

₹472.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Mamypoko pants All night absorbPant Style Baby Diapers Large Size(L), 40 Count, Ideal for 9-14Kgs1 DiaperWider Crisscross SheetGentle Coco Care12hr Leakage ProtectionPrevents Heaviness.

₹410.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Kidbea Steel Baby Feeding Bottle 250ml | Baby Milk Bottle with Advanced Anti Colic Valve, BPA Free, Soft Silicone Nipple, Wide Neck for Newborn & Infant Kids

₹299.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Mylo Baby AirPrime Premium Diaper Pants Small (S) Size (4–8 kgs) (26 Count) Leak Proof | Ultra-Thin & Breathable | Up to 12 Hours Protection | No Rashes

₹499.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Milton Baby Spout Sipper,No-Spill Design,BPA-Free,Food-Grade Material,Microwave-Sterilizer Safe,Easy-Grip,Smooth Open-Close Action,Lightweight,Ideal sipper water bottle for kids 12+Month, 420 ml,Green

₹449.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Silverflix Baby Disposable Diaper Bags with Dispenser Case – 7 Set (6 Rolls + Holder), Leak-Proof & Odor Control Nappy Disposal Waste Bags for Baby Diapers, Sanitary Pads, Pet Poop, Travel Friendly

₹199.00 (as of March 19, 2026 09:38 GMT +05:30 - )

Mee Mee Baby Liquid Cleanser 500ml, Anti-Bacterial Kills 99.9% Germs | Cleanser for Bottles, Nipples, Accessories, Toys, Fruits & Vegetables | No Alcohol, One Drop Cleaning, Dermatologically Tested

₹198.00 (as of March 19, 2026 09:38 GMT +05:30 - )

TEDDYY Easy Baby M Size Diaper Pant Style | 74 Count (Medium) | 7–12 kg (Pack of 1) | Long Protection Hours | Anti-Bacterial | Airy Breathable Fit | Rapid Soaker Channels with Wetness Indicator

₹464.00 (as of March 19, 2026 09:38 GMT +05:30 - )

ZEBRONICS Blanc Slim Wireless Mouse with Rechargeable Battery, BT + 2.4GHz, 4 Buttons, 800/1200/1600 DPI, Silent Operation, Multicolor LED Lights

₹399.00 (as of March 19, 2026 15:26 GMT +05:30 - )

XIAOMI Pad 8 Nano Texture Display Creator's Edition with Focus Pen Pro | Snapdragon 8s Gen 4 |11.2" 3.2K | 12GB, 256GB | Ultra Slim Metal Design | 9200mAh Battery | HyperAI | Wi-Fi 7 | Graphite Grey

Now retrieving the price.

(as of March 19, 2026 15:26 GMT +05:30 - )

FEDUS Cat6 Ethernet Cable, 10M High Speed 550MHZ / 10 Gigabit Speed UTP LAN Cable, Network Cable Internet Cable RJ45 Cable LAN Wire, Patch Computer Cord Gigabit Category 6 Wires for Modem,WHITE

₹286.00 (as of March 19, 2026 15:26 GMT +05:30 - )

American Tourister Valex Laptop Backpack, 28L & 17" Inch Laptop Compartment, front organiser, bottle holder Backpack Bag For Man And Women, Black

₹999.00 (as of March 19, 2026 15:26 GMT +05:30 - )

100W Fast Charging cable USB-A to Type-C Compatible with OnePlus 15/15R13/13R/12R/12/11/11R/10/10R/9/9R/8/8T,Nord 5/4/3/2,CE4/3/2/Lite Support all USB to Type-C Devices BY APFEN®

₹287.99 (as of March 19, 2026 15:26 GMT +05:30 - )