PHP Tutorial For Beginners

PHP stands for hyper text pre-processor

It is a server side scripting language.

It is used to create dynamic websites.

It supports OOP from version 5

PHP Tags

The php code is enclosed between <?php and ?>

Example,

<?php # opening tag
    # code
?> # closing tag

Hello World in PHP

We can use echo or print statements to output any data

<?php 

# using echo statement
echo 'Hello world';

# using print function
print('Hello world');

?>

The echo statement can also be used with parentheses

<?php echo('Hello world'); ?>

Variables in PHP

The variables are declared using a $ symbol preceding the variable name

For example,

<?php

# declaring a variable
$username = 'Joe';

?>

Data Types

Integer
Double (float)
String
Boolean
Array

<?php

# integer
$total = 24;

# double (float)
$percent = 91.1;

# string
$name = 'Joe';

# boolean
$is_even_number = true;

# array (single dimension)
$students = array('Harry', 'John', 'Doe', 'Kalle');

?>

Loops

for
while
foreach

<?php

# for loop
for ($i = 0; $i <=10; $i++) {
    echo $i;
}

# while loop
$i = 0;
while ($i <=10) {
    echo $i;
    $i++;
}

# foreach loop
$fruits = array('Apple', 'Mango', 'Banana');
foreach ($fruits as $fruit) {
    echo $fruit;
}

?>

Conditional statements

if - else example,

<?php

$i = true;

if ($i) {
    echo 'i is equal to true';
} else {
    echo 'i is not equal to true';
}

?>

if - else if - else example,

<?php

if (condition_1) {
    # task 1
} else if (condition_2) {
    # task 2
} else {
    # task 3
}

?>