Basic Syntax

Let's start with some basic PHP syntax and examples to help you understand how it works :

PHP code is typically enclosed within <?php and ?> tags. Anything outside these tags is treated as regular HTML.

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<?php
// PHP code goes here
?>
 

Variables in PHP start with a dollar sign $ followed by the variable name. PHP is loosely typed, so you don't need to declare variable types.

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$name = "John";
$age = 25;
 

You can use the echo or print statement to output data to the web browser.

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echo "Hello, World!";
 

PHP supports single-line and multi-line comments.

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// This is a single-line comment
/*
This is a
multi-line comment
*/
 

PHP supports various data types, including integers, floats, strings, booleans, arrays, and objects.

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$intVar = 42;
$floatVar = 3.14;
$stringVar = "Hello, PHP!";
$boolVar = true;
 

You can concatenate strings using the . operator.

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$first_name = "John";
$last_name = "Doe";
$full_name = $first_name . " " . $last_name;
 

PHP supports standard conditional statements like if, else if, and else.

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$age = 20;
if ($age < 18) {
    echo "You are a minor.";
} elseif ($age >= 18 && $age < 65) {
    echo "You are an adult.";
} else {
    echo "You are a senior citizen.";
}
 

PHP has for, while, and foreach loops for iterating through data.

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for ($i = 0; $i < 5; $i++) {
    echo $i . " ";
}
$numArray = [1, 2, 3, 4, 5];
foreach ($numArray as $num) {
    echo $num . " ";
}
 

You can create and use functions to encapsulate reusable code.

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function add($a, $b) {
    return $a + $b;
}
$result = add(5, 3); // $result will be 8
 

PHP has several predefined arrays called superglobals that provide access to various global variables like $_GET, $_POST, and $_SESSION.

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$user_input = $_POST['user_input'];
 

These are some of the basic PHP syntax elements and examples to get you started. PHP is a versatile language used for building dynamic websites and web applications, and you can explore more advanced topics like database connectivity, object-oriented programming, and frameworks as you become more familiar with the basics.