best example is WordPress, which uses it to handle theme files.
there are several functions used to work with files:
1. readfile(): used to only read the content of a file
2. fopen(): used to open files in different modes
3. fread(): used to read an opened file
4. fwrite(): used to write into an opened file
5.fclose(): used to close an opened file.
<?php
$filename = "myfile.txt";
$file = fopen($filename, "r"); //open file in read mode
$data = fread($file, filesize($filename)); //read file
echo $data; //printing data of file
$data = fread($file, filesize($filename)); //read file
echo $data; //printing data of file
fclose($file); //close file
?>
example: write into a file
$f = fopen('data.txt', 'w');//open file in write mode
fwrite($f, 'hello world ');
fwrite($f, 'php file');
fclose($f);
echo "File written successfully";
?>
echo "File written successfully";
?>
example:delete a file
unlink('data.txt');
echo "File deleted successfully";
?>
echo "File deleted successfully";
?>
example: create a folder
<?php
if(isset($_POST['save']))
{
$folder=$_POST['folder'];
if (file_exists($folder))
{
echo "folder is already created";
}
else
{
mkdir($folder);
echo "folder is created";
}
}
?>
<form method="post">
<h1>folder creation</h1>
<input type="text" name="folder">
<input type="submit" name="save">
</form>
example: delete a folder
<form method="post">
<h1>folder deletion</h1>
<input type="text" name="folder">
<input type="submit" name="sav1">
</form>
<br><br>
<?php
if(isset($_POST['sav1']))
{
$folder=$_POST['folder'];
if (file_exists($folder))
{
rmdir($folder);
echo "folder is deleted";
}
else
{
echo "folder doesn't exists";
}
}
?>
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