Web Development Exam > Web Development Videos > PHP for Absolute Beginners: From Novice to PHP Master > Beginner PHP Tutorial - 83 - File Handling: Listing Files Part 2
Beginner PHP Tutorial - 83 - File Handling: Listing Files Part 2 Video Lecture | PHP for Absolute Beginners: From Novice to PHP Master - Web Development
FAQs on Beginner PHP Tutorial - 83 - File Handling: Listing Files Part 2 Video Lecture - PHP for Absolute Beginners: From Novice to PHP Master - Web Development
| 1. How can I list all the files in a directory using PHP? |  |
Ans. To list all the files in a directory using PHP, you can use the opendir() function to open the directory, then use the readdir() function to read each file in the directory. Here's an example code snippet:
```php
$directory = "path/to/directory";
if(is_dir($directory)){
if($dh = opendir($directory)){
while(($file = readdir($dh)) !== false){
if($file != '.' && $file != '..'){
echo $file . "<br>";
}
}
closedir($dh);
}
}
```
This code will list all the files in the specified directory, excluding the "." and ".." directories.
| 2. How can I display only specific file types from a directory using PHP? | |
Ans. If you want to display only specific file types from a directory using PHP, you can modify the code snippet mentioned in the previous question. Here's an example to display only files with the ".txt" extension:
```php
$directory = "path/to/directory";
if(is_dir($directory)){
if($dh = opendir($directory)){
while(($file = readdir($dh)) !== false){
if($file != '.' && $file != '..' && pathinfo($file, PATHINFO_EXTENSION) == 'txt'){
echo $file . "<br>";
}
}
closedir($dh);
}
}
```
This code will only display files with the ".txt" extension from the specified directory.
| 3. How can I sort the listed files in alphabetical order using PHP? | |
Ans. To sort the listed files in alphabetical order using PHP, you can store the filenames in an array and then use the sort() function to sort the array. Here's an example code snippet:
```php
$directory = "path/to/directory";
$files = array();
if(is_dir($directory)){
if($dh = opendir($directory)){
while(($file = readdir($dh)) !== false){
if($file != '.' && $file != '..'){
$files[] = $file;
}
}
closedir($dh);
}
}
sort($files);
foreach($files as $file){
echo $file . "<br>";
}
```
This code will sort the filenames in alphabetical order before displaying them.
| 4. How can I list the files in a directory along with their file sizes using PHP? | |
Ans. To list the files in a directory along with their file sizes using PHP, you can modify the code snippet mentioned in the first question. Here's an example:
```php
$directory = "path/to/directory";
if(is_dir($directory)){
if($dh = opendir($directory)){
while(($file = readdir($dh)) !== false){
if($file != '.' && $file != '..'){
$filePath = $directory . '/' . $file;
echo $file . " - " . filesize($filePath) . " bytes<br>";
}
}
closedir($dh);
}
}
```
This code will display each filename along with its corresponding file size in bytes.
| 5. How can I list the files in a directory sorted by their last modified date using PHP? | |
Ans. To list the files in a directory sorted by their last modified date using PHP, you can modify the code snippet mentioned in the first question. Here's an example:
```php
$directory = "path/to/directory";
$files = array();
if(is_dir($directory)){
if($dh = opendir($directory)){
while(($file = readdir($dh)) !== false){
if($file != '.' && $file != '..'){
$filePath = $directory . '/' . $file;
$files[$file] = filemtime($filePath);
}
}
closedir($dh);
}
}
arsort($files);
foreach($files as $file => $modifiedTime){
echo $file . " - " . date("F d Y H:i:s.", $modifiedTime) . "<br>";
}
```
This code will display each filename along with its corresponding last modified date, sorted in descending order.
Text Transcript from Video
so hopefully this will make sense in a
moment when when we write it and you say
so I'm gonna say file equals read dir
this time and we're applying the handle
into that so we're reading in the handle
that we've already opened with open dir
and let me explain what happens in this
loop every time we go around this loop
file is going to equal the next file
along so in this case we have let's just
double check we've got three files here
so for the first loop will equal first
file dot txt then second file of txt
then third file opportunity now it will
only represent in a string format so
file is now a string format it's it
won't it won't actually be a link to the
file so we need to do that ourselves so
let's go ahead and just test this out we
can say echo file and then a line break
so let's so preview this in our browser
and see what it looks like okay so we we
have the first file dot txt second file
dot txt and third file dot txt however
you can also see that we've got these
this double dot here and this single
door here this is just part of a normal
directory structure so it's as long
along with the other files we've also
got this which means current directory
and this means back our directories so
these are the options that we can do by
saying go back a directory or forwarded
directory but we don't want to include
these because we just want to look
inside the files a look inside this
files directory and list our files so
let's go and see what we can do to sort
this out now we need to create a
condition inside of our loop so we need
to create an if statement here and one
end that there okay remember your block
so we've created an if statement and we
need to put a condition in here and the
condition is based upon something if
it's true we're going to echo the file
so the condition could be if file
doesn't equal
a dot and file doesn't equal two dots so
if it doesn't equal a dot and doesn't
equal two dots then we connect without a
file so therefore these this dot and
this two ducts will be eliminated for
our list and this echo won't happen okay
they're still exist this echo just won't
happen so let's go back and refresh and
see what that's done okay so that's got
rid of the third the one and the two
dots there so we've achieved that just
simply with an if statement here okay so
now what I want to do is create links to
the files and we can do this just by
appending on an eight eight eight ref
equals and then that's the start of the
a tag and then we end the a tag them
just like you do in a in an HTML
document a normal HTML document now the
link is going to be the directory and
then forward slash the file so inside
here what we can do is just append on
directory so what I've done here if you
didn't already notice I've ended the
echo so we've started the echo here but
ended the echo here using a dot to
append on our directory then we using a
dot to append on the rest of it
so we can just do for short like you
just saw me do two of two of these
single quotation marks and then two dots
and then in here we can write our
variable data so it's directory and then
it's forward slash and then two more
dots two more single quotation marks and
file so now what we can say is when we
refresh you can see that these are links
now if you look at the bottom of the
video in the left left-hand corner you
can see localhost forward slash series
forward slash file handling for such
files and then first file dot txt if I
move my mouse down to the second one you
can see that at the bottom of the video
in the in the bottom of the browser it
changes to second file and the same a
third file so now we can just click on
these and view the contents of the first
file view the contents of the second
file and view the contents of the third
file which you can see I've just written
the first file
second file and third file but obviously
if these were images you could change
the a href tag and you can instead
change it to image source and you could
point the image point the image to point
the source to the image that's located
within the directory and you could also
talk about using functions that we've
already already seen in previous
tutorials by myself to only show JPEG
files so we could what we could do is we
could either read in the file itself and
check the type or we could select
everything after the last dot and say is
it a JPEG file but for now I'll leave
you this this is a basic this is a basic
most standard structure of looping
through a file and displaying all files
that don't equal a dot and two dots
moment when when we write it and you say
so I'm gonna say file equals read dir
this time and we're applying the handle
into that so we're reading in the handle
that we've already opened with open dir
and let me explain what happens in this
loop every time we go around this loop
file is going to equal the next file
along so in this case we have let's just
double check we've got three files here
so for the first loop will equal first
file dot txt then second file of txt
then third file opportunity now it will
only represent in a string format so
file is now a string format it's it
won't it won't actually be a link to the
file so we need to do that ourselves so
let's go ahead and just test this out we
can say echo file and then a line break
so let's so preview this in our browser
and see what it looks like okay so we we
have the first file dot txt second file
dot txt and third file dot txt however
you can also see that we've got these
this double dot here and this single
door here this is just part of a normal
directory structure so it's as long
along with the other files we've also
got this which means current directory
and this means back our directories so
these are the options that we can do by
saying go back a directory or forwarded
directory but we don't want to include
these because we just want to look
inside the files a look inside this
files directory and list our files so
let's go and see what we can do to sort
this out now we need to create a
condition inside of our loop so we need
to create an if statement here and one
end that there okay remember your block
so we've created an if statement and we
need to put a condition in here and the
condition is based upon something if
it's true we're going to echo the file
so the condition could be if file
doesn't equal
a dot and file doesn't equal two dots so
if it doesn't equal a dot and doesn't
equal two dots then we connect without a
file so therefore these this dot and
this two ducts will be eliminated for
our list and this echo won't happen okay
they're still exist this echo just won't
happen so let's go back and refresh and
see what that's done okay so that's got
rid of the third the one and the two
dots there so we've achieved that just
simply with an if statement here okay so
now what I want to do is create links to
the files and we can do this just by
appending on an eight eight eight ref
equals and then that's the start of the
a tag and then we end the a tag them
just like you do in a in an HTML
document a normal HTML document now the
link is going to be the directory and
then forward slash the file so inside
here what we can do is just append on
directory so what I've done here if you
didn't already notice I've ended the
echo so we've started the echo here but
ended the echo here using a dot to
append on our directory then we using a
dot to append on the rest of it
so we can just do for short like you
just saw me do two of two of these
single quotation marks and then two dots
and then in here we can write our
variable data so it's directory and then
it's forward slash and then two more
dots two more single quotation marks and
file so now what we can say is when we
refresh you can see that these are links
now if you look at the bottom of the
video in the left left-hand corner you
can see localhost forward slash series
forward slash file handling for such
files and then first file dot txt if I
move my mouse down to the second one you
can see that at the bottom of the video
in the in the bottom of the browser it
changes to second file and the same a
third file so now we can just click on
these and view the contents of the first
file view the contents of the second
file and view the contents of the third
file which you can see I've just written
the first file
second file and third file but obviously
if these were images you could change
the a href tag and you can instead
change it to image source and you could
point the image point the image to point
the source to the image that's located
within the directory and you could also
talk about using functions that we've
already already seen in previous
tutorials by myself to only show JPEG
files so we could what we could do is we
could either read in the file itself and
check the type or we could select
everything after the last dot and say is
it a JPEG file but for now I'll leave
you this this is a basic this is a basic
most standard structure of looping
through a file and displaying all files
that don't equal a dot and two dots
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About this Video
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Nov 19, 2024 Last updated |
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