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These tags are the base element for any html webpage, and they define how the structure is laid for a particular page.

Head – This tag contains all the head elements for a particular webpage. The content in head tag loads before the body tag. External scripts, CSS files, style files, etc will also go inside head tag.
Title – This defines the title of a web page
Body – This is the actual content of webpage

i – to put a certain text in italics
em – to put emphasis on certain text (generally behaves same as i tag)
div – create a division element on webpage
b – bold the text within <b>..</b> tags
p – create a new paragraph (automatically starts from a new line)
<br /> - put a line break, so that the text following this tag starts on a new line.

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Lets get started with a hyperlink using <a> tag and <href> attribute of a tag

<a> - Stands for anchor tag

<href> - Href attribute specifies the URL of the page that the link should go to

URL should be the actual link to which the user should be redirected, for eg: in case of google.com the URL must be http://www.google.com

Lets try it in editor

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Strings need to be enclosed within quotes as shown above, however numbers must only be written as normal numbers, without any quotes surrounding them

if they are at least 16 years old, we tell them:

“Great! you can proceed with signup” and if they are less than 16 years old, we give the output:

“Sorry, you need to wait till you are 16”

Lets work out this program now using if statement…

  1. 100/10 evaluates to 10

  2. 5*(3+1) evaluates to 20

  3. 45*(200+300) evaluates to 22500

var greet = function(name)

{

  console.log(‘Hello’ + name);

};

for (var i = 1; i < 11; i = i + 1)

{

  console.log(i);

}

In this video, we are demonstarting how to install XAMPP for PHP, My SQL and PHP.

XAMPP is a free and open source web server solution consisting Apache HTTP Server, MySQL database, and interpreters for scripts written in the PHP and Perl programming languages.

  echo "Hello PHP!";

echo “Hello, the age is ” . $myAge

Lets try it out…

<?php

  echo (29 * 500) + (36 * 19) - 20000;

?>

Lets try it out…

$myName = “Deep Sukhwani”;

$myAge = 25;

List of comparison operators:

Eg:

if ( $userAge > 16 )

{

   echo “You can drive!”;

}

Optionally you can also have else statements, these will execute when the condition fails to fulfill (i.e. if the answer to the condition is no.)

Eg (contd. from above):

else

{

    echo “Sorry, you can’t drive!”;

}

switch (2) {

        case 0:

            echo 'The value is 0';

            break;

        case 1:

            echo 'The value is 1';

            break;

        case 2:

            echo 'The value is 2';

            break;

        default:

            echo "The value isn't 0, 1 or 2";

switch (variable)

{

}

switch ($i):

endswitch;

$names = array(”Deep", ”Raj", ”Kunal" );

You can add any type of information to an array, and you do it in much the same way as when declaring variables. Use "" when adding strings, and just enter the number when adding integers. Each item in an array must be separated by a comma:

$names = array(“Deep”, “Raj”, “Kunal”);

The first item “Deep” in above array is numbered 0

Second item “Raj” is numbered 1 and so on…

Therefore, we can access a particular item of the array using its position, like this:

echo $names[1]

//outputs “Raj”

$names = array(“Deep”, “Raj”, “Kunal”);

echo $names[1];

//outputs “Raj”

$names[1] = “Tania”;

echo $names[1];

//outputs “Tania”

Eg:

$languages = array(“JavaScript”, “Python”, “PHP”);

unset($languages [2]);

You can even delete the whole array:

unset($languages);

for ($i = 0; $i < 10; $i++)

{

    echo $i;

}

So the above example says: "Start looping with $i at 0, stop the loop before $i gets to 10, count up by 1 each time, and for each iteration, echo the current value of $i."

($i++ is the shorthand for $i = $i + 1.)

while (condition)

{

    //Code to execute as long as the condition is true..

    //some logic to turn condition to false

    //the logic to turn condition false is necessary else

    //the loop will execute forever (infinite loop)…

}

while (condition)

{

    //Code to execute as long as the condition is true..

    //some logic to turn condition to false

    //the logic to turn condition false is necessary else

    //the loop will execute forever (infinite loop)…

}

<?php

  // get the length of a string and

  // print it to the screen

  $length = strlen(”Deep Sukhwani");

  print $length;

?>

$myname = “Deep”

$partial = substr($myname, 0, 3);

print $partial

// prints “dee”

Note: the second parameter (the starting character) is based on a zero-indexed array (i.e. the first character in your string is number 0, not number 1)

Lets see some more useful string functions like strtoupper() and strtolower(), which makes your entire string UPPERCASE or lowercase.

strpos(“deep”, “p”); //3

strpos(“tecwallet”, “tec”); //0

The parameter passed to the strpos() function as like haystack and needle. The function tries to find the needle in the haystack.

It returns either the index of the first character or false if the “needle” cannot be found.

Eg:

if (strpos(“deep”, “a”) == false)

{

    print “Sorry no ‘a’ in ‘deep’”;

}

Lets try this example…

$round = round(M_PI);

print $round; //prints 3

Lets round pi to 4 decimal places

$round_decimal = round(M_PI, 4);

print $round_decimal;

Note: M_PI is a PHP constant that is equal to the value of pi

// prints a number between 0 and 32767

print rand();

//prints a number between 1 and 10

print rand(1,10)

$names = array();

array_push($names, “Deep”);

array_push($names, “TecWallet”);

array_push($names, “Abhishek”);

array_push($names, “Paras”);

print count($names); // prints 4

$array = array(5, 3, 7, 1);

sort($array);

print join(", ", $array);

Eg:

$array = array(5, 3, 7 ,1);

rsort($array);

print join(":", $array);

// prints "7:5:3:1”