Logical Operators Video Lecture | PHP for beginners - Software Development

hello YouTube welcome to the 12th
tutorial in the PHP programming series
and in this video we're going to cover
the logical operators now in the
previous video we covered conditional
operators for when you're making an
arguments in a if statement and for this
video we're going to cover the logical
operators and it's a start off we'll
just make it simple
we'll make a file make the PHP file
first call it logic dot PHP I'm going to
make a simple if statement
we'll make a variable called name and
we'll put the name to Chris and then
we'll have an if statement inside of the
brackets it's going to say if name equal
to Chris then what we're going to do is
output the text
welcome to the website ok that's simple
enough you should know what this means
from previous tutorials so let's go to
logic dot PHP and it says welcome to the
website so what we can do now is add a
logical operator and what a logical
operator does is allows us to add more
than one condition inside of the bracket
so we can have one two three or however
many conditions that you want and all of
them have to be true for this statement
to execute so what we're going to do now
is make a new variable called password
and we'll set that's a password one now
I'm not recommending you to use this as
a login system because it's not secure
and it's not very practical if you have
more than one account because let's say
somebody gets access to your server then
they can view this PHP file and they can
view your password in plain text and at
all passwords of your users so it is not
recommended to use this login
authentication system but if you would
like to use this then to test it out
then feel free to but for the purpose of
this tutorial we're just going to
pretend this is a login system ok so one
of the consolatory ters is and and one
will do as you say it will make sure
that the if statement runs through two M
conditions before X use the code so if
you try the keyword and
after we tape on we can also set under
the statements so we're going to say
password is equal to password 1 so well
it's going to say okay if the name is
equal to Chris check and the password is
equal to password one check then I'll
echo welcome to the websites we'll save
that and you can see that I chose this
but if we change one of the letters that
change it to password - then nothing
could be executed because as you can see
the condition is false so that is the
and in logical operator no and also we
can use the or so what we can do is
maybe set ourselves to passwords so
we'll have a new password you should use
username for this one password will be
password 1 and then what we can do is so
this is saying that the user has entered
the password password 1 and then what we
can do is we can go down here and we can
say if and have our umbrellas and curly
braces we can see if password is equal
to and our first password that will
accept is password - that we deface
password that we recognise and what like
if we execute this right now
then this will be false because the
password is not password - but we can
also say we'll have another password
will except using or so just like the
Andi type out loop the word or or
password is equal to password 1 so what
this is saying now is saying ok
the users entered the password is
password 1 and says if the password is
equal to password 2 then it will execute
the statement but that's false we can go
to or password is equal to password 1
which it is so it will execute the
statement so let's echo welcome to the
website we'll save that
just passed out on a line 5i now missed
the semicolon put that in there and it
says welcome to the website so if we
change this to password two we will also
be granted authentication welcome to the
website both if you change this to
something outside of the or statements
like password three as you can see
nothing is executed because we have not
entered a correct password so thanks for
watching this tutorial if you have any
questions leave a comment once again you
should not use this as a login system I
will be making tutorials on my sequel in
databases and also encryption in a
future tutorial so you should watch that
one it is released it will I think it's
going to be around number 25 but you
know for now just for the purpose of
testing out logical operators you can
just run this test it out or be creative
and create your own way so to summarize
the and logical operator will allow us
to enter more than one condition to be
true so sorry more than one condition
has to be true so we can have multiple
conditions have to be true inside of the
brackets and the or logical operator
will allow us to have more than one
option to be true so not just one
condition we'll have multiple conditions
and any of them can be true so please
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