Web Development Exam > Web Development Videos > PHP for Absolute Beginners: From Novice to PHP Master > Beginner PHP Tutorial - 89 - Uploading Files: Restricting File Size
Beginner PHP Tutorial - 89 - Uploading Files: Restricting File Size Video Lecture | PHP for Absolute Beginners: From Novice to PHP Master - Web Development
FAQs on Beginner PHP Tutorial - 89 - Uploading Files: Restricting File Size Video Lecture - PHP for Absolute Beginners: From Novice to PHP Master - Web Development
| 1. What is the maximum file size that can be uploaded using PHP? |  |
Ans. The maximum file size that can be uploaded using PHP depends on the server's configuration. By default, PHP allows a maximum file size of 2MB. However, this limit can be changed by modifying the `upload_max_filesize` directive in the php.ini file.
| 2. How can I restrict the file size while uploading files in PHP? | |
Ans. To restrict the file size while uploading files in PHP, you can use the `$_FILES` superglobal array to access the uploaded file's information. You can check the file size by using the `$_FILES['file_name']['size']` syntax and compare it with the desired limit. If the file size exceeds the limit, you can display an error message and prevent the file from being uploaded.
| 3. Is there a way to display a custom error message when the file size exceeds the limit? | |
Ans. Yes, you can display a custom error message when the file size exceeds the limit. After checking the file size using `$_FILES['file_name']['size']`, you can use conditional statements to compare it with the desired limit. If the file size exceeds the limit, you can assign a custom error message to a variable and display it to the user.
| 4. Can I dynamically set the maximum file size limit based on user roles or permissions? | |
Ans. Yes, you can dynamically set the maximum file size limit based on user roles or permissions. You can store the desired file size limits in a database or a configuration file and retrieve them based on the user's role or permission level. By doing so, you can have different file size limits for different user roles or permissions.
| 5. How can I handle large file uploads in PHP without running into memory or execution time issues? | |
Ans. To handle large file uploads in PHP without running into memory or execution time issues, you can modify the `upload_max_filesize`, `post_max_size`, and `max_execution_time` directives in the php.ini file. Increasing these limits will allow PHP to handle larger file uploads. Additionally, you can use techniques such as chunked file uploads or streaming uploads to process the file in smaller parts, reducing the memory and execution time requirements.
Text Transcript from Video
hi this is Alex from PHP academy' door
creating this video for the new Boston
we've already looked in file uploading
at how to actually upload the file then
what we did is we went on to look at the
security so we made sure that this file
could only be jpg or with the jpg
and we did that in two ways to ensure
that we have the maximum security
possible however what happens if we want
to check the file size now file size is
actually processed through in bytes so
we can uncomment this now because we
want to use this so let's just echo that
out and then we'll comment how the rest
of this code so we can preview the
result of this so let's just go and
choose a file we'll choose this image
file again and click Submit now you'll
see that this file has been returned at
one hundred forty five thousand eight
hundred and one bytes so we can
automatically tell by looking at it with
simple maths that this is one hundred
and forty five kilobyte file nearly one
hundred and forty six kilobytes so we
can use this to allow ourselves to
process files let's say we don't want to
file over two megabytes we don't an
image file over two megabytes so let's
say we are going to stick without two
megabyte maximum allowed file size now
the way we do this is we can easily work
this out using Google so if I just pull
up this page here you can see I've
already typed two megabytes two bytes
Google's automatically use the
calculator to work this out for me it's
two million and then blah blah blah so
if we just copy and paste this we can
copy and paste this into a variable in
our code so we can get rid of these
comments now so I want as well as let's
just get rid of this echo as well as
well as extension up here I now want to
create a variable undersized saying max
size so I'm going to make this equal to
this number obviously we want to pull in
the spaces so we've got it as an integer
so the max size is this so we need to
now perform a simple check to see if the
max size is less than or equal to
sighs so what we're going to do is we
are going to modify this here and we're
going to create another answer using
another logical operator here and and
we're saying and size smaller than max
size so now we need to modify our error
message accordingly accordingly and must
be two megabytes for or less okay so now
what we're doing is well it's checking
for the file extension we're also and
then checking that the size is less than
oh I forgot the equals two so less than
or equals two Mac size so this is a this
is basically going to work now so let's
just double check I don't actually have
a file available that's more than two
megabytes at the moment so what I'm
going to do is I'm going to slightly
decrease this value and I'm going to say
a hundred hundred kilobytes so the
maximum is a hundred kilobytes which is
ten thousand well it's not exactly
because of the you know just how it
works out but we could more accurately
calculate that there so now I'm just
going to say a hundred thousand bytes
okay so let's open up our choose file
now let's get rid of everything in our
uploaded folder just so we like this
we've got one file in there let's just
get rid of that let's pop a star in
there and we'll delete that one there
okay so now what we're going to do is
we're going to upload two files and
because I've now set my limit to roughly
100 kilobytes because as far as more
than 100 kilobytes it won't be uploaded
it's 142 kilobytes so if I click on that
and click Submit you can see that we're
now getting the error message far must
be jpg and must be 2 megabytes or less
so you can modify your error message
accordingly or you could do two
different if statements and one to check
the extension and give the appropriate
message or you can do one and and you
could do one to check
and give the appropriate message there
as well so now let's choose this let's
choose this file dot PHP now this one at
this point just to point out if I was to
change this to file jpg and I was to try
and upload this you can see at the
moment it's being uploaded and the
reason for this is we need to change our
if statement slightly I've just realized
from the last video that we need to make
em an adjustment so we also need to say
and type equals equals and we need to
say image and we need to say jpg okay so
now let's try and choose this fake JPEG
file which is actually a PHP file and
we'll click Submit and it's giving us
the appropriate error message however
let's just say I was too and if we have
an image here that's under a hundred
I'll there we go we've got one here
that's fifty four point three kilobytes
so let's try and upload that we click we
click Submit and it hasn't worked so
let's go back again and this is just my
logic and we need to let's just first of
all and close this in brackets so we can
see what we're doing properly we need to
say if type equals image JPEG or type
equals image jpg so let's try again so
as long as you can get your head around
the logic of it which I'm obviously
having a problem doing at the moment
you'll be absolutely fine so let's try
not blow this 54 kilobyte file and that
says uploaded let's just try and upload
the fake file and click Submit and that
says uploaded okay so little part let's
go back and just revise our code and
first of all so image extension is jpg
or jpg we also need to say and type
equals and this should always be correct
if the file type is a jpg file so let's
just and then we check for the size so
let's just go through this again
so let's try and upload first of all
just a normal file okay so the size is
bigger than two megabyte so now let's
try not flowed one that's under the size
which is this one here click Submit okay
so that's been uploaded now let's try
and upload this file jpg this PHP file
we've renamed and that still being
uploaded okay so I think probably at
this point if a user were to rename a
PHP file to jpg there's nothing that
they can actually do with it in terms of
on the server it will still be uploaded
as an image file unless they have access
to the server to rename it I don't think
it actually matters at this stage
however as it stands we are securing our
form as much as possible with regards to
only allowing JPEG files to be uploaded
we using the extension and the type
obviously by changing this we've changed
the type so we have a bit of a problem
but nevertheless we'll just test this
out quickly and type in an echo next to
the type just to see what happens when
we upload this let's click Submit yeah
you can see it's imaged 4/2 trip that's
just simply because we've renamed the
file so I think for now we've we've
secured it quite nicely our files have
been uploaded and we've checked for the
size
creating this video for the new Boston
we've already looked in file uploading
at how to actually upload the file then
what we did is we went on to look at the
security so we made sure that this file
could only be jpg or with the jpg
and we did that in two ways to ensure
that we have the maximum security
possible however what happens if we want
to check the file size now file size is
actually processed through in bytes so
we can uncomment this now because we
want to use this so let's just echo that
out and then we'll comment how the rest
of this code so we can preview the
result of this so let's just go and
choose a file we'll choose this image
file again and click Submit now you'll
see that this file has been returned at
one hundred forty five thousand eight
hundred and one bytes so we can
automatically tell by looking at it with
simple maths that this is one hundred
and forty five kilobyte file nearly one
hundred and forty six kilobytes so we
can use this to allow ourselves to
process files let's say we don't want to
file over two megabytes we don't an
image file over two megabytes so let's
say we are going to stick without two
megabyte maximum allowed file size now
the way we do this is we can easily work
this out using Google so if I just pull
up this page here you can see I've
already typed two megabytes two bytes
Google's automatically use the
calculator to work this out for me it's
two million and then blah blah blah so
if we just copy and paste this we can
copy and paste this into a variable in
our code so we can get rid of these
comments now so I want as well as let's
just get rid of this echo as well as
well as extension up here I now want to
create a variable undersized saying max
size so I'm going to make this equal to
this number obviously we want to pull in
the spaces so we've got it as an integer
so the max size is this so we need to
now perform a simple check to see if the
max size is less than or equal to
sighs so what we're going to do is we
are going to modify this here and we're
going to create another answer using
another logical operator here and and
we're saying and size smaller than max
size so now we need to modify our error
message accordingly accordingly and must
be two megabytes for or less okay so now
what we're doing is well it's checking
for the file extension we're also and
then checking that the size is less than
oh I forgot the equals two so less than
or equals two Mac size so this is a this
is basically going to work now so let's
just double check I don't actually have
a file available that's more than two
megabytes at the moment so what I'm
going to do is I'm going to slightly
decrease this value and I'm going to say
a hundred hundred kilobytes so the
maximum is a hundred kilobytes which is
ten thousand well it's not exactly
because of the you know just how it
works out but we could more accurately
calculate that there so now I'm just
going to say a hundred thousand bytes
okay so let's open up our choose file
now let's get rid of everything in our
uploaded folder just so we like this
we've got one file in there let's just
get rid of that let's pop a star in
there and we'll delete that one there
okay so now what we're going to do is
we're going to upload two files and
because I've now set my limit to roughly
100 kilobytes because as far as more
than 100 kilobytes it won't be uploaded
it's 142 kilobytes so if I click on that
and click Submit you can see that we're
now getting the error message far must
be jpg and must be 2 megabytes or less
so you can modify your error message
accordingly or you could do two
different if statements and one to check
the extension and give the appropriate
message or you can do one and and you
could do one to check
and give the appropriate message there
as well so now let's choose this let's
choose this file dot PHP now this one at
this point just to point out if I was to
change this to file jpg and I was to try
and upload this you can see at the
moment it's being uploaded and the
reason for this is we need to change our
if statement slightly I've just realized
from the last video that we need to make
em an adjustment so we also need to say
and type equals equals and we need to
say image and we need to say jpg okay so
now let's try and choose this fake JPEG
file which is actually a PHP file and
we'll click Submit and it's giving us
the appropriate error message however
let's just say I was too and if we have
an image here that's under a hundred
I'll there we go we've got one here
that's fifty four point three kilobytes
so let's try and upload that we click we
click Submit and it hasn't worked so
let's go back again and this is just my
logic and we need to let's just first of
all and close this in brackets so we can
see what we're doing properly we need to
say if type equals image JPEG or type
equals image jpg so let's try again so
as long as you can get your head around
the logic of it which I'm obviously
having a problem doing at the moment
you'll be absolutely fine so let's try
not blow this 54 kilobyte file and that
says uploaded let's just try and upload
the fake file and click Submit and that
says uploaded okay so little part let's
go back and just revise our code and
first of all so image extension is jpg
or jpg we also need to say and type
equals and this should always be correct
if the file type is a jpg file so let's
just and then we check for the size so
let's just go through this again
so let's try and upload first of all
just a normal file okay so the size is
bigger than two megabyte so now let's
try not flowed one that's under the size
which is this one here click Submit okay
so that's been uploaded now let's try
and upload this file jpg this PHP file
we've renamed and that still being
uploaded okay so I think probably at
this point if a user were to rename a
PHP file to jpg there's nothing that
they can actually do with it in terms of
on the server it will still be uploaded
as an image file unless they have access
to the server to rename it I don't think
it actually matters at this stage
however as it stands we are securing our
form as much as possible with regards to
only allowing JPEG files to be uploaded
we using the extension and the type
obviously by changing this we've changed
the type so we have a bit of a problem
but nevertheless we'll just test this
out quickly and type in an echo next to
the type just to see what happens when
we upload this let's click Submit yeah
you can see it's imaged 4/2 trip that's
just simply because we've renamed the
file so I think for now we've we've
secured it quite nicely our files have
been uploaded and we've checked for the
size
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Nov 19, 2024 Last updated |
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