A PHP based file manager back end.

simple_file_manager.php

<?php

//Change directory based on input from URL.
function change_directory()
	{
	//If a directory variable is present in URL, change directory to match.
	if (isset($_GET['dir_change']))
		{
		$directory_to_change = $_GET['dir_change'];
		chdir($directory_to_change);
		}
	//If no directory variable is present in URL, change directory to defauly value.
	else 
		{
		chdir(ROOT_DIRECTORY); 
		}	
	}
	

//Refresh page.
function refresh()
	{
	echo '<META HTTP-EQUIV="Refresh" Content="1; URL="<YOUR URL PATH TO FILE>';
	}


//List contents of a folder.
function list_directory()
	{
	echo '<h3>Actions: </h3>';
	//Form to set check boxes and radio buttons.
	echo '<form name = "file_actions" method = "POST">';
	//Radio buttons.  Select file operation to perform.  Default to "edit".
	echo '<input type = "radio" name = "file_action" value = "delete">Delete&nbsp&nbsp';
	echo '<input type = "radio" name = "file_action" value = "edit" checked = "checked">Edit &nbsp&nbsp';
	echo '<input type = "radio" name = "file_action" value = "rename">Rename &nbsp&nbsp';
	echo '<input type = "radio" name = "file_action" value = "new">New File &nbsp&nbsp';
	echo '<input type = "radio" name = "file_action" value = "copy_move">Copy or Move File &nbsp&nbsp';
	echo '<input type = "radio" name = "file_action" value = "upload">Upload &nbsp&nbsp';
	echo '<input type = "submit" name = "modify_file">';
	//Set file list variable to current working folder.
	$file_list = scandir(getcwd());
	//Start file list.
       	echo '<ul style = "list-style-type: none;">';
	//Display all files in directory one by one. 
	foreach($file_list as $files)
		{
		//Ignore the '.' (or current directory folder).
	        if($files != '.')
			{

	            	echo '<li><input type = "checkbox" name = "file_select[]" value = "' . getcwd() . '/' .$files . '">';
			//Check if file is directory.  Set link change directory variable accordingly.
			if (is_dir($files))
				{
				echo '<a href = "<YOUR URL PATH TO FILE>&dir_change=' . getcwd() . '/'. $files . '">' . $files. '</a>'; 			
				}
			//Check if file is an image.  Display link to image.
			elseif (substr(strrchr($files,'.'),1) == "jpg" || substr(strrchr($files,'.'),1) == "JPG" || substr(strrchr($files,'.'),1) == "png" || substr(strrchr($files,'.'),1) == "PNG")
				{
				//Remove root default directory from working directory string.  Absolute path will not work in URL.				
				echo '<a href = "'. str_replace(ROOT_DIRECTORY, "", getcwd()) . '/' . $files . '">' . $files . '</a>';	
				}
			//Check if file is a text file.  Display link to text file. 
			elseif (substr(strrchr($files,'.'),1) == "txt")
				{
				//Remove root default directory from working directory string.  Absolute path will not work in URL.				
				echo '<a href = "'. str_replace(ROOT_DIRECTORY, "", getcwd()) . '/' . $files . '">' . $files . '</a>';	
				}
			//By defauly, display just the file names.
			else
				{
	            		echo $files;
				}
		

	            	echo '</li>';
	     
			}
		}
	//End list and form.
    	echo '</ul>';
	echo '</form>';
	
	//If the submit button is pressed, execute following actions.	
	if (isset($_POST['modify_file']))
		{
		//If the upload radio button is selected, set the session variable 'editor_activate' to 3.  
		//This will cause the upload function to be called when page refreshes.  
		//Refresh page when done.
		if ($_POST['file_action'] == 'upload')
			{
			$_SESSION['editor_activate'] = 3;
			echo '<h3>Entering upload screen...</h3>';
			refresh();
			}

		//If the upload radio button is selected, set the session variable 'editor_activate' to 4.  
		//This will cause the file file function to be called when page refreshes.  
		//Refresh page when done.
		if ($_POST['file_action'] == 'new')
			{
			$_SESSION['editor_activate'] = 4;
			echo '<h3>Entering file create screen...</h3>';
			refresh();
			}


		//Detect all the files who's check boxes have been selected. 
		foreach($_POST['file_select'] as $selected_list)
			{

			//Count how many boxed have been checked. 
			$check_count++;

			//If edit radio button is selected and only one check box has been selected, set session variable 'working_selected_file' to selected file.   				// Set session 'editor_activate" variable to one.  This calls the editor function when page is refreshed. 
			//Refresh page when done.
			if ($_POST['file_action'] == 'edit' && $check_count == 1)
				{
				$_SESSION['working_selected_file'] = $selected_list;
				$_SESSION['editor_activate'] = 1;
				echo '<h3>Editing:' . $selected_list . '...</h3>';
				refresh();
				}

			//If edit radio button is selected, and more than one file is checked, display error message.
			//Refresh page when done.
			elseif ($_POST['file_action'] == 'edit' && $check_count > 1)
				{
				echo '<h3>Cannot edit more than one file at a time!  Only first checked file will be used.</h3>';
				}

			//If delete radio button is selected, call the delete file function.  
			//Refresh page when done
			elseif ($_POST['file_action'] == 'delete')
				{
				delete_file($selected_list);
				refresh(); 
				}

			//If rename radio button is selected and only one box is checked, set session 'working_selected_file' variable to selected file.
			//Set session 'editor_activate' variable to 2.  This will call the rename function when page is refreshed.
			//Refresh page when done.
			elseif ($_POST['file_action'] == 'rename' && $check_count == 1)
				{
				$_SESSION['working_selected_file'] = $selected_list;
				$_SESSION['editor_activate'] = 2;
				echo '<h3>Entering rename screen...</h3>';
				refresh();
				}
			//If rename radio button is selected and more than one box is checked, diaplay error messahe.
			//Refresh page when done.
			elseif ($_POST['file_action'] == 'rename' && $check_count > 1)
				{
				echo '<h3>Cannot rename more than one file at a time!</h3>';
				refresh();
				}
			//If copy move radio button is selected, set session 'working_selected_file' to selected file.
			//Set session 'editor_activate' variable to 5.  This will call the copy move function when page is refreshed.
			//Refresh page when done.
			elseif ($_POST['file_action'] == 'copy_move')
				{
				$_SESSION['working_selected_file'] = $selected_list;
				$_SESSION['editor_activate'] = 5;
				echo '<h3>Entering Copy Move Screen...</h3>';
				refresh();
				}

			echo '<br>';
			}		
		}
	}



//Editor function.
function editor($get_file) 
	{
	//Get contents of working file.
	$working_file = file_get_contents($get_file);
	//Create input text box and put contents of file in it.
	echo '<br><form name = "editor_form" method = "POST">';
	echo '<textarea id = "editor" name = "editor" rows = "50" cols = "100">' . $working_file . '</textarea><br><br>';
	echo '<input type = "submit" name = "edit_file"></form>';
	//If submit button is pressed, edit contents of file based on textbox input.
	//Reset session 'editor_activate' variable.
	//Refresh page when done.
	if (isset($_POST['edit_file']))
		{
		file_put_contents($get_file, $_POST['editor']);
		$_SESSION['editor_activate'] = 0;
		refresh();

		}

	}

//Delete file function.
function delete_file($get_file)
	
	{
	echo '<h3>Deleting file: ' . $get_file . '</h3>';
	//If file is a folder, use the rmdir function.
	if (is_dir($get_file))
		{
		rmdir($get_file);
		}
	//If file is not a folder, use the unlink function.
	else 
		{
		unlink($get_file);
		}
	}

//Rename file function.
function rename_file($get_file)
	{
	echo '<br>';
	//Create form and text input to create new filename.
	//Display current name of file.
	echo '<h3>Renaming file:' . $get_file . '</h3>';
	echo '<form name = "rename" id = "rename" method = "POST">';
	echo '<input type = "text" name = "rename_file" id = "rename_file"><br><br>';
	echo '<input type = "submit" name = "rename_file_submit" id = "rename_file_submit"></form><br>';
	
	//if Submit button us pressed, rename file based on text input.
	//Reset session 'editor_activate' variable.
	//Refresh page when done.
	if (isset($_POST['rename_file_submit']))
		{
		rename($get_file, (getcwd() . '/' . $_POST['rename_file']));
		echo '<h3>Renaming to: ' . getcwd() . '/' . $_POST['rename_file'] . '</h3>';
		$_SESSION['editor_activate'] = 0;
		refresh();
		}
	
	}

//File upload function.
function upload_file($get_file)
	{
	//Display current directory where file will be uploaded. 
	echo '<h3>Uploading to directory: ' . getcwd() . '<h3>';
	//Create file upload form and button.
	echo '<form name = "upload_file" method = "POST" enctype="multipart/form-data"><br><br>';
	echo '<input type = "file" name = "file_upload"><br><br>';
	echo '<input type = "submit" name = "upload_submit"></form>';

	//If submit button is pressed, upload the file to temp and then move file to working directory.
	//Reset session 'editor_activate' variable.
	//Refresh when done.
	if (isset($_POST['upload_submit']))
		{
		$upload_file_name = $_FILES['file_upload']['name'];
		$upload_file_temp_name = $_FILES['file_upload']['tmp_name'];
		move_uploaded_file($upload_file_temp_name, (getcwd() . '/' . $upload_file_name));
		$_SESSION['editor_activate'] = 0;
		refresh();		
		}
	
	}


function new_file($get_file)
	{
	echo '<br>';
	//Display directory where file will be created in.
	echo '<h3>Creating file in" ' . getcwd() . '</h3>';
	//Create form with text box to input file name.
	echo '<form name = "create" id = "create" method = "POST">';
	//Create radio buttons to choose between creating a file or folder.
	echo '<input type = "radio" name = "file_create" value = "file">Create File &nbsp&nbsp';
	echo '<input type = "radio" name = "file_create" value = "folder">Create Folder &nbsp&nbsp';
	echo '<input type = "text" name = "create_file" id = "create_file"><br><br>';
	echo '<input type = "submit" name = "create_file_submit" id = "create_file_submit"></form><br>';

	//If submit button is pressed, create file or folder.
	//Reset session 'editor_activate' variable.
	//Refresh page when done. 
	if (isset($_POST['create_file_submit']))
		{
		//If create file radio button is selected, create new file.
		if ($_POST['file_create'] == 'file')
			{
			$new_file_name = $_POST['create_file'];
			$new_file_handle = fopen($new_file_name, 'w');
			fclose($new_file_handle);
			echo '<h3>Creating file: ' . getcwd() . '/' . $_POST['create_file'] . '</h3>';
			}
		//If create folder radio button is selected, create a new folder.
		elseif ($_POST['file_create'] == 'folder')
			{
			//NOTE, when implementing this code, do not grant folder full permissions. I did this for testing purposes. 
			mkdir(getcwd() . '/' . $_POST['create_file'], 0777);
			}

		$_SESSION['editor_activate'] = 0;
		refresh();
		}
	
	}

function copy_move_file($get_file)
	{
	$file_name_only = array_pop(explode('/', $get_file));
	echo '<h3>File to be copied or moved: ' . $get_file . '</h3>'; 
	echo '<form name = "file_copy_move" method = "POST">';
	//Radio buttons.  Select file operation to perform.  Default to copy or move.
	echo '<input type = "radio" name = "file_copy_move" value = "copy">Copy to&nbsp&nbsp';
	echo '<input type = "radio" name = "file_copy_move" value = "move">Move to &nbsp&nbsp';
	echo '<input type = "submit" name = "copy_move_file">';
	
	//Set file list variable to current working folder.
	$file_list = scandir(getcwd());
	//Start file list.
       	echo '<ul>';
	//Display all folders in directory one by one.
	//This will set the destination folder for file to be copied or moved. 
	foreach($file_list as $files)
		{
		//Ignore the '.' (or current directory folder).
	        if($files != '.')
			{

			if (is_dir($files))
				{
				echo '<li><a href = "<YOUR URL PATH TO FILE>&dir_change=' . getcwd() . '/'. $files . '">' . $files. '</a></li>'; 			
				}

	     
			}
		}
	echo '</ul>';
		
	//If submit button is pressed, copy or move file.
	//Reset session 'editor_activate' variable.
	//Refresh when done.
	if (isset($_POST['copy_move_file']))
		{
		//If copy radio button is selected, copy file.
		if ($_POST['file_copy_move'] == 'copy')
			{
			copy($get_file, (getcwd() . '/' . $file_name_only));
			}
		//If move radio button is selected, copy file and delete original.
		elseif 	($_POST['file_copy_move'] == 'move')
			{
			copy($get_file, (getcwd() . '/' . $file_name_only));
			delete_file($get_file);	
			}
		$_SESSION['editor_activate'] = 0;
		refresh();	
		}
	
	
	}



//Start a PHP session.  This is necessary for session variables to be set.
//I will have the session be set by a login page when other elements of my CMS backend are complete.
if (session_status() == PHP_SESSION_NONE) 
	{
	session_start();
	//Define server root directory constant.
	define('ROOT_DIRECTORY', '/var/www');
	

	}

//Call different functions based on the session 'editor_activate' variable.
switch($_SESSION['editor_activate'])
	{
	//If session 'editor_activate' variable is one, call the editor function.
	case 1:
	editor($_SESSION['working_selected_file']);
	break;

	//If session 'editor_activate' variable is two, call the rename file and change directory function.
	case 2:
	change_directory();
	rename_file($_SESSION['working_selected_file']);
	break;

	//if session 'editor_activate' variable is three, call the upload file and change directory function.
	case 3:
	change_directory();
	upload_file();	
	break;
	
	//if session 'editor_activate' variable is four, call the new file and change directory function.
	case 4:
	change_directory();
	new_file();
	break;

	//if session 'editor_activate' variable, call copy move file and change directory function.
	case 5:
	change_directory();
	copy_move_file($_SESSION['working_selected_file']);
	break;
	
	//By defauly, call the change directory, display current directory, and call the list directory function.
	default:
	change_directory();
	echo '<br>';
	echo '<h3>Current Directory: ' . getcwd() . '</h3>';
	echo '<br>';
	list_directory();
	break;
	}

?>