Ok guys and girls, this is lesson 6 and I hope we can at least get to lesson 100! 😀

Today we will have a look at functions in PHP. First, what’s a function? It’s simply a sort of container for code. Whenever you call the function, the code inside gets executed. Also, functions can accept parameters, which are values that the function needs to work. If you remember a bit of your maths, “cos x” is a function, and x is the parameter or argument. Usually the result you get by doing the cosine operation is the return value. Just remember those terms for later.

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Last time we saw how to work with the different kinds of loops: the While, Do While, For and Foreach loops. Today, we are going to see two keywords, “break” and “continue” that you may use to operate on loops and Switch blocks. You can consider this to be a continuation of the Loops lesson.

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Loooooops!

In this lesson, we will have a look at the foreach function in php.

First, what is a loop? I’d say something that repeats or involves a repetition can be considered a loop. In programming, you use a loop to have a bunch of codes run for a number you set. If there were no loops, you’d have to write that piece of code x times if you wanted to run it for x times, which is crazy! Read on to know the solution!

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Ok, even some developers who already understand php a little are always confused about arrays and don’t really know how to use them. In this lessons, we will try to cover the basic uses of Arrays in PHP.

When you declare a variable, it can only hold one value. Like the example below:

<?php

$my_variable = "This is some text";

?>

As you can see, it can only store “This is some text”, or a single value. But what if you have to store multiple values which have some relationship between them? Let’s take an example from the previous lesson, remember our guy named John? We declared his age. Let’s say we want to add his name, location etc. We can do it like this:

$persons_age = ’16’;
$persons_name = ‘John’;
$persons_location = ‘California’;

But with the use of arrays, you can store all of that information in one variable. Like below:

<?php

$persons = array('John','16','California');

?>

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Today we will have a look at what Conditional Statements are.

Conditional Statements allow you to perform different kinds of actions based on a given condition. It can either return true or false.

A little Non-Programming example to give you an idea of Conditional Statement Below:

Let’s consider a guy named John, is 16 years old and wants to go to a casino. Unfortunately, casinos doesn’t allow Minors.

So basicaly, the condition is:

If John is less than 18 years old, then don’t let him inside the casino, else, let him in.

Now there are two words that are always used in PHP Conditional Statement. They are “IF” and “ELSE”. Before going on, you should know we are using caps here for emphasis. When using these keywords in code, they are lowercase! PHP is case-sensitive. “IF” and “if” are different things for PHP. Use “if” in code.

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Welcome to Part 2 of the PHP lessons.

In the previous lesson, we talked about how to get started with PHP, setting up a local environment to develop in PHP. We also talked about Variables and how they can be very useful when developing.

Just to refresh yourself up, the way we write a variable is like so:


$myVariable = "This is some fancy text";
echo $myVariable;
?>

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What is php?

PHP is a powerful programming language for programmers to add interactivity to web pages, making them dynamic. What does “dynamic” mean? Simply “not static”! It may seem strange, but this is exactly what it is. Traditionally, web pages were “static”, coded in HTML. Nowadays, these pages are filled contents that change over time. Think about a blog, if you’re starting one then get managed wordpress hosting with knownhost. Aren’t new articles added from time to time? Well in the past, someone had to go edit a webpage, add code and add the article there manually. Nowadays, the article is pulled from a database, and dynamically added to a page as it is posted. That’s what PHP does: generating pages on the fly with content, with the help of HTML and other languages of course.

PHP is free (as in no cash needed, and open source – you can download and view the PHP source code) and is among the most popular programming languages used for Website Developement, to do processing.

What does PHP stands for?

PHP means: Hypertext Pre-Processor (HP, right? It’s a recursive acronym! It originally meant, Personal Home Page). It is a server side language and are executed on a server (Not on a local machine like Javascript, HTML and CSS). PHP can interact with Many databases out there such as MySql, Oracle, etc. To fully make use of PHP, a minimum knowledge of HTML is required, as well as some basic CSS if you wish to make things look nicer, but CSS is not directly required.

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