PHP Tutorial 6 - Comments (PHP For Beginners) Video Lecture | PHP for beginners - Software Development

okay hello youtube and welcome to the
sixth tutorial in the PHP programming
series and this is going to be a little
short video it's not very interesting
it's just about comments now comments
are very very useful when you start
programming really big applications for
example you know some web applications
I'm currently working on there's a few
pages of over 1,000 lines of code and
should navigate into that you know
trying to figure out where everything is
it's really really annoying but with
comments I can just you know navigate it
a lot more easily so to start this
tutorial off we'll need to create the
start and end PHP tags and we'll just
save this as comments PHP and we're
going to write a few lines of code going
to echo welcome to my website or break
after that and will will echo this a few
times we'll copy it and paste it earlier
the cheating way are you enjoying it and
then we'll have one last line okay so
this is pretty much you going to output
you know well on our website are you
enjoying it and I hope you like the
message and we cover the echo function
before so you should not be this far if
you don't know what this means okay so
you'll you'll understand the point to
this in just a moment so just bear with
me and up here we're going to create
some variable we're gonna say name
equals Chris H equals 18 and color
equals blue oops
and I'll spot the American Col they're
just my American ears and okay so we'll
just put a little little live text
eko actually no you won't we'll stick
with this that should be enough okay so
we can use comments in two ways and the
actual main the reason that we have
comments in PHP is this comment our code
to skip code so if we actually save this
right now come on stop PHP and you know
we have these three messages what we can
do is use your comment to comment out a
line now what our comment will do is
escape an entire line of any PHP code so
acts like it doesn't exist so if we type
two forward slashes that will indicate
comment so now you can now hit save
and you'll notice the middle line is
gone that's because it's been commented
out and we can then put that back and
another function for comments is to just
name your variables or you know set of
code and that's what I like to do so
let's say just for these three variables
we could just say below all my variables
know just so you can keep yourself
updated you know might want to add some
lines in there just to keep yourself you
know so you can just oh here's my
variables right here but if we save this
and then it'll fresh it it's saying that
we've got an error and that's because
PHP is trying to interpret this line as
PHP code but obviously it's nonsense the
server just looks at this and just
thinks what the hell is this it's
nonsense so we can do is comment this
out and then just save that and now we
can have a light nice little comment
here sync it all here's my variables
right here
save that reload and it works again and
that's how to use a single line comments
in PHP now another form of commenting
you can use in PHP is multi-line and use
that by doing a forward slash and then a
star and doing a forward slash in a star
will indicate that you are starting to
comment some lines of code out and to
finish that all you need to do is do a
star and then a full slash again so
between these start and forward slash
just
spit it out a bit this is all commented
out between here so we save this and
it'll only output the last message and
let's just you know take this off so now
you just echo that one save it and you
know we've see that do that again our
comments might seem a little weird to
you right now because we're only like
writing you know ten lines of code but
trust me when you're more experienced
you will really rely on comments and
also if you're ever going to become a
web developer then if you have a cell
your content then you know whoever
you're selling it to is going to be
really annoyed enough comments because
they won't understand your code at all
so thanks you for watching this tutorial
please leave a comment if you have any
questions I will answer them also
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