Array in php - Indexed, Associative And Multidimensional

PHP Basic Syntax | Variables, Array, Data types, Strings

PHP Basic Syntax | Variables, Array, Data types, Strings

A PHP script can be placed anywhere in the document.

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

// PHP 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:

‘Syntax’ is the structure of statements in a computer language. The syntax of PHP is very easy to understand compared to some other programming languages.

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Example

PHP

echo "Hello, world!";

Output:

Hello, world!

 

SGML or Short HTML Tags: These are the shortest option to initialize a PHP code. The script starts with <?and ends with ?>. This will only work by setting the short_open_tag setting in the php.ini file to ‘on’.

Example:

PHP

echo "Hello, world!";

 Output:

Hello, world!

HTML Script Tags: These are implemented using script tags. This syntax is removed in PHP 7.0.0.  So its no more used.

Example:

PHP

<script language="php">

echo "hello world!";

</script>

Output:

hello world!

ASP Style Tags:To use this we need to set the configuration of the php.ini file. These are used by Active Server Pages to describe code blocks. These tags start with <% and end with %>.

Example:

PHP

<%

# Can only be written if setting is turned on

# to allow %

echo "hello world";

%>

Output:

hello world

 

Constants:

Constants can be defined using the const keyword or define() function.

There is some difference between constants and variables.

  • Constants do not have $ in front of them like variables have.
  • Constants can be accessed from anywhere without regard to variable scoping rules.

 

PHP Case Sensitivity

Look at 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:

Example:

<!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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