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[MUSIC]

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Welcome to Your Computer.

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I'm Alena and

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I'll be your guide as we learn to
communicate with your file system.

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Everything on a computer is
stored in some sort of file.

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Understanding how to read and

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manipulate those files will provide a very
powerful tool for controlling the system.

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While this may sound like an all
powerful and lofty goal, and it can be.

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File handling is also an important
part of any application.

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You often need to open and
process a file for

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different tasks such as reading and
config.

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You may also need to write files
such as exporting order details.

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In this course, we'll start by
exploring the file structure itself

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to read what files are where.

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Then we'll move on to different ways
of reading and writing those files.

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In the next section,
we'll explore some common data types and

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how to parse that data into
something we can use in PHP.

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One of the biggest issues you'll
run into when trying to read or

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write files is permissions.

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If you're having any
access issues reading or

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writing files, check the notes
associated with this video.

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Are you ready to take control?

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Then let's get started.

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Open the workspace attached to this video.

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At this point, you should be familiar
with browsing files here on the left,

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opening and closing folders and
seeing what's there.

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What you're seeing is actually
a script that's reading the files and

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displaying them as it's been instructed.

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So let's read and
display these files ourselves using PHP.

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Create a New File named index.php.

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We'll start with
the function name scandir.

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This scans the directory and
returns an array of files and

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directories from the given directory.

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I want to look in the data directory,
so we'll pass data for the directory.

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I'll put the results in
a variable named $files.

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Let's display these files as a list
by looping through the array.

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For each files as file.

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[SOUND] And

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then,we echo file.

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Let's preview this in the browser
to see what we have so far.

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The single dot represents
the current directory and

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the double dots represent
the path to go up one level.

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DS_Store is a hidden mac file.

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We don't want to show any of these or

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any other hidden files
that start with the dot.

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So let's check the first character.

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If the first character is not a dot,
then we'll display the file.

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Let's preview this in the browser again.

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Great, only our folders are displayed but
I want this to be recursive and

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scan any subdirectories as well.

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Let's go back to work spaces and
turn this into a function.

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ReadFolderFiles and
we'll pass the directory.

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Now, we can call this function.

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And parse data.

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Now, we're ready to do
something different,

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if the file is a directory or not.

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If is_dir,

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the directory plus the file.

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Then we're going to echo the file,
and call our function again.

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We'll pass dir plus the file.

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If it's not a directory,
we want to add a link to that file.

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Let's jump back to the browser and
see what we have now.

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Great, just what we want,
a list of all the folders and

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sub-files in the data directory.

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We could style these however we wanted and

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apply any action we want to control
the behavior of the display.

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But, let's get into actually
reading those files next.