Author: Samuel

1.) Functions refresher

print the number of characters in your name:

$length = strlen("Samuel");
echo $length;


2.) Functions Syntax

typical structure of a function:

function name(parameters) {
statement;
}



function helloWorld() {
echo "Hello world!";
}


3.) First Function


function displayName() {
echo "Samuel";
}
displayName();


5.) Returning Values

Instead of printing something to the screen, what if you want to make it the value that the function outputs so it can be used elsewhere in your program? In PHP, the return keyword does just that. It returns to us a value that we can work with. The difference between this and echo or print is that it doesn’t actually display the value.


function returnName() {
return "samuel";
}


6.) Parameters and Arguments

Functions wouldn’t be nearly as useful if they weren’t able to take in some input. This is where parameters or arguments come in. These are the variables or inputs that a function uses to perform calculations.

$name = "Samuel";
function greetings($name) {
echo "Greetings," .$name. "!";
}

greetings($name);

7.) Practice Defining multiple parameters


$name = "Samuel";
$age = "28";

aboutMe($name, $age);


This is just useful notes for my own later use. Spoiler alert if you don’t want the answers to these lessons than don’t read on any farther.

Lesson 7:

1.) Introducing Functions

strlen() string function. You pass this a string or a varialbe containing a string and it will return the number of characters in the string. Example:

$length = strlen("Samuel");
print $length;

2.) String Functions

substr() You pass this function the string you want to get a subsctring of, the character in your string to start at, and how many characters you want after your starting point. For example:

print the first 3 letters of my name:

$myname = "Samuel Bell";
$partial = substr($myname,0,3);
print $partial;

print my name in uppercase:

$uppercase = strtoupper($myname);
print $uppercase;

print my name in lowercase:

$lowercase = strtolower($uppercase);
print $lowercase;