need help writing a script that can simply clear or delete a file

i want to write a script that performs a simple task. when u click a link or button, it will automatically delete a file, or clear that file. is this possible? and if so how would it be done? im using a form to write to this file, its CSV but the same would work with a txt file. i want to be able to clear it from the website by just clicking a link/button.

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First of all you must be carefull with this script (reason is obvious...)

Let's say that you store the filename in a variable like :

Code:

<?php
 $file = '/var/www/html/filetodelete.txt';

then to clear the file you need this :

Code:

<?php
 $fp = fopen( $file, 'w' );
 fwrite ( $fp , '' );
 fclose ( $fp );

to delete it just use this :

Code:

<?php
 unlink ( $file );

ok but how would i make a link that performs that task

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It seems that you do not know much of PhP but it's ok

I can write this for you, but you have to tell me some basic stuff.

Do you want it to delete specific files each time or a variable file?

If the file is variable does all your files exist in a specific directory? This has to do with the security of the script

its just a single file that creates itself everytime u save changes on the script i have written. so the php script to delete it could delete it completely, or just clear it. doesnt matter. currently the file is located in the same dir as the script, its a csv file.

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So here is your code :

Code:

<?php
 $filename = 'change_this_with_your_filename';
 if ( isset( $_GET['delete'] ) )
 {
     unlink ( './' . $filename );
 }
?>

Put this on a php file (eg. del.php) and you should call it this way :

site.com/del.php?delete=1

i get this error when trying to delete the file with the link

Warning: unlink(./db.csv): Permission denied in /hsphere/local/home/meth0d42/meth0d.justinlove.net/del.php on line 5

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It seems that you don't have enough permissions.

Use this :

Code:

<?php
$filename = 'change_this_with_your_filename';

if ( isset( $_GET['delete'] ) )
{
 $fp = fopen( $filename, 'w' );
 fwrite ( $fp , '' );
 fclose ( $fp );
}
?>

Warning: fopen(db.csv): failed to open stream: Permission denied in /hsphere/local/home/meth0d42/meth0d.justinlove.net/del.php on line 6

Warning: fwrite(): supplied argument is not a valid stream resource in /hsphere/local/home/meth0d42/meth0d.justinlove.net/del.php on line 7

Warning: fclose(): supplied argument is not a valid stream resource in /hsphere/local/home/meth0d42/meth0d.justinlove.net/del.php on line 8

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You should contact with your hosting company.

This is a permission problem. If you have shell access to your server, then run this:

Code:

chown apache:apache db.csv

If this wont work try

Code:

chmod 755 db.csv

great man it works now! i should of known to chmod it im not that stupid.. but how to we tell the script to reload the page u were on once its finished clearing it? because it shows a blank page if its successful when i want it to show either the same page (index.htm) or a pop-up confirmation or something

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<?
 header ( "Location: http://urlToRedirect.com/ " );
?>

By the way I don't wont to offend you, but you should not start a hosting service without have knowledge of this stuff. It is a bit risky.

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