LERAN PHP COMPLETE

Learn one of the most powerful programming languages in the world and become a rockstar developer.

Syntax Overview


A PHP script is executed on the server, and the plain HTML result is sent back to the browser.

A PHP script can be placed anywhere in the document.

A PHP script starts with <?php and ends with ?>:

<?php
    // Your code goes here
?>

The default file extension for PHP files is ".php".

A PHP file normally contains HTML tags, and some PHP scripting code.

Below, we have an example of a simple PHP file, with a PHP script that uses a built-in PHP function "echo" to output the text "Hello World!" on a web page:

<!DOCTYPE html>
<html>
    <body>
        <h1>My first PHP page</h1>

        <?php
          echo "Hello World!";
        ?> 
</body>
</html>
Note: PHP statements end with a semicolon (;).

Commenting PHP Code

comment is the portion of a program that exists only for the human reader and stripped out before displaying the programs result. There are two commenting formats in PHP −

  • Single Line Commenting
  • Multiple Line Commenting

for more details, View below code

<!DOCTYPE html>
<html>
<body>

<?php
     // This is a single-line comment

     # This is also a single-line comment

     /*
         This is a multiple-lines comment block
         that spans over multiple
         lines
    */

    // You can also use comments to leave out parts of a code line
    $x = 5 /* + 15 */ + 5;
    echo $x;
?>

</body>
</html>

PHP Case Sensitivity

In PHP, NO keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are case-sensitive.

In the example below, all three echo statements below are legal (and equal):

<!DOCTYPE html>
<html>
<body>

<?php
     ECHO "Hello World!<br>";
     echo "Hello World!<br>";
     EcHo "Hello World!<br>";
?>
</body>
</html>
Tips: However; all variable names are case-sensitive.

In the example below, only the first statement will display the value of the $color variable (this is because $color$COLOR, and $coLOR are treated as three different variables):

<!DOCTYPE html>
<html>
<body>

<?php
$color = "red";
echo "My car is " . $color . "<br>";
echo "My house is " . $COLOR . "<br>";
echo "My boat is " . $coLOR . "<br>";
?>

</body>
</html>

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