PHP (Hypertext Preprocessor) is a scripting language that is primarily used for web development. Here are some of the basic syntax rules for writing PHP code:
PHP code is typically embedded in HTML pages and is enclosed in special PHP tags:
<?php
and?>
. Code outside of these tags is treated as regular HTML.PHP statements end with a semicolon (;).
Variables are declared using the dollar sign ($) followed by the variable name. For example,
$name = "Arv";
.Strings can be enclosed in single quotes (‘ ‘) or double quotes (” “). For example,
$greeting = 'Hello';
or$message = "It's a beautiful day!";
.Comments can be added to PHP code using either two forward slashes (//) or a forward slash and an asterisk (/* */).
Control structures, such as if statements and loops, are used to control the flow of execution in a PHP program.
PHP has a number of built-in functions, such as
echo
,print
,strlen
,strpos
,substr
,date
, and many others, that can be used to perform various tasks.
Here is an example of a simple PHP program that demonstrates some of these syntax rules:
<!DOCTYPE html>
<html>
<head>
<title>PHP Syntax Example</title>
</head>
<body>
<?php
$name = "John";
$age = 25;
$greeting = "Hello, " . $name . "! You are " . $age . " years old.";
echo $greeting;
?>
</body>
</html>
In this example, we declare two variables, $name
and $age
, and use them to create a string, $greeting
, using the concatenation operator (the period or dot). We then use the echo
function to output the string to the web page.