Perform Delete, Edit and search operation on a file using php - php

Question

I have a task to do in which i have to list the directories with it's files which i did, but i don't understand how to delete file or edit specific file in the directories any help will be appreciated Thanks.
<?php
error_reporting(0);
if(isset($_GET['dir']))
{
// /$path = 'E:\xampp\\'.$_GET['dir'];
$path = $_GET['dir'];
}
else
{
$path = 'E:\xampp\\';
}
if(is_dir($path))
{
$arrDir = scandir($path);
echo "<ul>";
foreach ($arrDir as $key => $value)
{
echo "<a href='http://localhost/vishrut/FileUpload/filelist.php?
dir=".$path.'/'.$value."'>".$value.'</a><br>';
}
echo "</ul>";
}
else
{
echo "<textarea>";
echo file_get_contents($path);
echo "</textarea>"."<br>";
}
?>

Answer 1

There are lots of PHP's functions to handle files: https://www.php.net/manual/en/ref.filesystem.php
For your needs see these:
file_get_contents to read the entire file contents
file_put_contents to write the content in a file
unlink to delete a file
So, the steps to modify a file may be:
get the complete contents with file_get_contents:
$contents = file_get_contents($filePath);
apply your edits to the $contents content:
$newContents = ...
overwrite the file content:
file_put_contents($filePath, $newContents);
To delete a file is simple:
unlink($filePath);
It's important to note that your code is subjected to injection because you don't check the user data passed with $_GET.
If your script will be used only by you it's ok, instead you must check all user input: the first rule of Web programming is NEVER TRUST YOUR USERS! Also trusted users may write wrong characters in the url and that may have unexpected results (e.g. delete the wrong file!)
Read https://www.php.net/manual/en/mongodb.security.script_injection.php