• A PHP script can be placed anywhere inside an HTML document. They start with the tag:

    • <? PHP
    // PHP code is written here
    ?>

    PHP scripts use a function called "echo" to output text as "Hello!" to a web page. Create a file, write a simple PHP expression and save with the .php extension:

    <? Php
    echo "Hello!";
    ?>

    We store it in the index root folder.php in the Apache root file (In Windows, it is usually the folder
    C:/xampp/htdocs). Now open the web browser and go to http://localhost/index.php 

    Each PHP row ends with a semicolon (;).
    We can include PHP in the HTML script tag.

    <Html>
    <Head>
    <title> My first page in PHP </title>
    </ Head>
    <Body>
    <script language = "php">
    echo "Hello!";
    </Script>
    </Body> </ html>

    But in the latest version only tags are recommended <? PHP? >. Also, short tags can be used, as long as they are supported by the server:

    For example:

    <?
    echo "Hello!";
    ?>

    However, <? PHP? > as the official standard, is the way recommended for writing PHP scripts.

    Echo
    PHP has the "echo" construction function, which is used to output text. It is not a function; it is a construct of language. So it doesn't require snake nails.

    example:

    <? Php
    echo "I'm learning PHP!";
    ?>

    The text can be in double or single quotes.

    PHP instructions

    <? Php
    echo "A";
    echo "B";
    echo "C";
    ?>

    The PHP code lines end with a comma. Forgetting the endpoint will give an error. HTML tags can be added to the PHP echo function.

    example:

    <? Php
    echo "<strong> This is a dark text. </strong>";
    ?>



    PHP Case Sensitivity
    -In PHP, all keywords (for example if, else, while, echo, etc.), classes, functions, and user-defined functions are not case-sensitive. In the example below the three statements are the same:

    <! DOCTYPE html>
    <Html>
    <Body>

    <? Php
    ECHO "Hello! <br>";
    echo "Hello! <br>";
    EcHo "Hello! <br>";
    ?>
    </Body>
    </Html>