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PHP Syntax Overview
Introduction to PHP Syntax:
PHP is a server-side scripting language designed primarily for web development. It is embedded within HTML and is executed on the server.
Basic PHP Script:
A simple PHP script starts with <?php and ends with ?>. This tells the server to process the code within these tags.
<?php
echo "Hello, World!";
?>
Variables in PHP:
Variables in PHP start with a dollar sign ($) followed by the name of the variable. Variable names are case-sensitive.
<?php
$greeting = "Hello, World!";
echo $greeting;
?>
PHP Data Types:
PHP supports several data types such as strings, integers, floats, booleans, arrays, objects, NULL, and resources.
<?php
$string = "Hello";
$integer = 42;
$float = 3.14;
$boolean = true;
?>
PHP Arrays:
Arrays in PHP are used to store multiple values in a single variable. There are three types of arrays: indexed, associative, and multidimensional.
<?php
$colors = array("red", "green", "blue");
echo $colors[0]; // Outputs: red
?>
Control Structures:
PHP supports standard control structures like if, else, switch, while, for, and foreach loops.
<?php
$number = 5;
if ($number > 0) {
echo "Positive number";
}
?>
Functions in PHP:
Functions are reusable pieces of code that perform a specific task. They are defined using the function keyword.
<?php
function greet($name) {
return "Hello, " . $name;
}
echo greet("Alice");
?>
PHP Comments:
Comments in PHP can be single-line or multi-line. Single-line comments use // or #, while multi-line comments are enclosed within /* */.
<?php
// This is a single-line comment
# Another single-line comment
/* This is a
multi-line comment */
?>
