Math Operators Video Lecture | PHP for beginners - Software Development

hello YouTube welcome to tutorial number
8 in the PHP programming series and in
this video we're going to cover the
basic math functions in PHP and what
we're going to cover is addition
subtraction multiplication division and
we're also going to just cover
increments and decrements so as always
you will start our PHP file off with the
start and an ending for a PHP file I'm
going to save this as math PHP and so
basically jumping straight into it the
basic way to add a number is as you
would think and you're going to just do
one value and then the add sign and then
another value but in PHP as we learned
in one of the earlier tutorials when
working with integers we do not have to
use double or single quotations we can
just put them out as a number so we're
going to echo 10 and then plus 1 5 and
if we just have a semicolon there and
then move go to math PHP it should echo
15 there we go echoes 15 so that is how
to use the addition function of PHP but
what we're going to do here is I'm going
to show you all four so I'm just going
to create two variables just create one
vapor one it's going to be calling them
one no one is going to equal ten you'll
need any quotations by the way and num
num - it's going to equal 15 and we're
going to perform some simple
mathematical operations down here and
we'll use comments to make it much
neater as well so the first one is
addition and what we're going to do is
echo out we'll just use the variable
num1 plus num2 and we'll also
concatenate a break onto that as well
HTML break you should know what
concatenation is when working with
strings so all it is is going to just
add this string to the start line break
to make it neater and then we'll do
subtraction and with subtraction all you
need to do is use the you know obviously
the subtract
button on your keyboard so no one and
then instead of plus a cheetah - none -
I'm will also put a brake on to that
concatenate on there and if you're
confused by what this full stop and
single quotes are then watch the
previous tutorial and this is where it
gets different to what you would think
when dealing with in multiplication so
when dealing with multiplication you
don't you can't exactly put an X there
so what you need to do is we're going to
echo num1 and you need to hold down the
shift key and press 8 on your keyboard
for the star sign and that will indicate
the PHP to multiply these two numbers
together so num 1 x num2 once again
concatenate to break and then finally
we'll look at division so what division
you just do a forward slash and then
will echo num1 forward slash to divide
num2 and we don't need a concatenation
to break there it's a last line so if
you save this so expecting this and well
not this is an exactly math tutorial
book just to go over there so 10 plus 15
is going to be 25 10 - 15 will be minus
5 and then 10 multiplied by 15 is 150
and division I'm not going to work that
out so I'm really tired right now so
let's let PHP do the hard work for us ok
so the first one as we expect it has
written 25 as it's 10 plus 15 and then
if we have 10 minus 15 is minus 5 10
multiplied by 15 is 150 and then if we
have 15 sorry 10/15 we've got this long
decimal here so that is how to use the
basic math functions in PHP you can also
store the result of a math function in a
variable so if you want to do results
equals num1 push
num2 and you can just echo out result so
if we reload that 25 10 plus 15 and also
what we can do is we can increment or
decrement numbers and that is just
basically adding 1 or subtracting 1 from
the number so if we have num1 the
weighted incremental number by 1 is plus
plus so if we do know 1 plus plus and
some 8 semicolon let me do it again then
1 plus plus you can see that as num1 is
10 it should now be 12 by this point so
if we echo it out right here
save it it should come to 12
there we go and we can also use - - to
decrement the number so gnome - - - and
then gnome actually known 1 - - and then
no 1 - - and we can echo num1 again and
it will be 8 because you've taken away 1
each time so they are the basic math
functions of PHP it's not very
interesting honorable all of this will
lead to more interesting concepts in
future tutorials so you know stick with
it try it out you can even make it on
calculated if you understand luckily
we'll go over the posting get in a fare
tutorial but you know just play around
with that make sure you are familiar
with the math functions and yep thanks
for watching