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Posted by programming on 04/12/07 09:44
On Apr 12, 8:44 am, "amygdala" <nore...@noreply.com> wrote:
> "programming" <periklis.ioan...@gmail.com> schreef in berichtnews:1176327375.195579.189940@d57g2000hsg.googlegroups.com...
> On Apr 11, 10:56 pm, Kim André Akerø <kiman...@NOSPAMbetadome.com>
> wrote:
>
>
>
> > programming wrote:
> > > On Apr 11, 7:08 pm, Toby A Inkster <usenet200...@tobyinkster.co.uk>
> > > wrote:
> > > > programming wrote:
> > > > > say i would like to delete the middle line of this txt, in
> > > > > member.txt what php code or logic would help me accomplish this?
>
> > > > For a small file:
>
> > > > 1. Read member.txt into an array (the "file" function is
> > > > your friend);
> > > > 2. Make the changes to the array (the "unset" function is
> > > > your friend);
> > > > 3. Output the array to "member-new.txt";
> > > > 4. Delete "member.txt";
> > > > 5. Rename "member-new.txt" to "member.txt";
>
> > > > If the file is larger (more than say, 500 kB) this might become a
> > > > bit memory-hungry, and it's worth looking at iterating over each
> > > > line of the file individually rather than reading it all into
> > > > memory at once.
>
> > > Thanks for you steps, i had a go at doing it..is this what you meant
> > > by any chance?
>
> > > <?php
>
> > > $line = file ("./member.txt", "w");
> > > unset($line);
>
> > > $line = fopen("./member-new.txt");
>
> > > unlink("./member.txt")
>
> > > rename("member-new.txt","member.txt");
>
> > > fclose($line);
>
> > > ?>
>
> > > I am getting a parse error, and i am not sure if i am doing this
> > > right??
>
> > > Parse error: syntax error, unexpected T_STRING in /volumes/data1/home/
> > > pioannou/public_html/php/Assignment11/admin/delete_member.php on line
> > > 11
>
> > The parse error itself comes from the missing semicolon on the line
> > with the unlink() function.
>
> > Second, you have placed the "w" parameter on the wrong function (on the
> > file() function instead of the fopen() function).
>
> > Thirdly, you're attempting to move/rename the new file BEFORE closing
> > the file handle for it. This could cause problems in terms of
> > locking/permissions.
>
> > Fourthly, you still haven't output the updated array to the new file
> > yet. Also, you're unsetting (deleting) the entire array instead of just
> > a single item.
>
> > After fixing the errors, the final source code snippet should look
> > something like this (with comments attached):
>
> > <?php
>
> > // Which line number (counting from 0) should we delete?
> > $line_to_delete = 4;
>
> > // Load the lines into an array; newlines are still attached
> > $lines = file ("./member.txt");
>
> > // Delete the line number from the array
> > unset($lines[$line_to_delete]);
>
> > // Open the new file for writing
> > $lines_update = fopen("./member-new.txt", "w");
>
> > // 1. Join the array to a single string (newlines are already attached)
> > // 2. Write the updated array to the new file
> > fwrite($lines_update, join("", $lines);
>
> > // Close the file handle to allow other operations on the file
> > fclose($lines_update);
>
> > // Remove the old file
> > unlink("./member.txt");
>
> > // Rename the new file to use the old filename, replacing the old file
> > rename("member-new.txt","member.txt");
>
> > ?>
>
> > --
> > Kim André Akerø
> > - kiman...@NOSPAMbetadome.com
> > (remove NOSPAM to contact me directly)
> > this sounds good, but the only think i am confused about know is the
> > line_to_delete = 4;
> > is there any chance of matching the entry line from my web page to the
> > line
> > in the text file by using a superglobal to catch the value that needs
> > to be matched to the line in the file...
>
> $line_to_delete = 'this is my test line.';
>
> /*
> // instead of:
> unset($lines[$line_to_delete]);
> // use:
> */
>
> // deletes every occurence of the line, case insensitive
> foreach($lines as $key => $value)
> {
> if(strtolower($value) == strtolower($line_to_delete))
> {
> unset($lines[$key]);
> }
>
> }
>
> // or, deletes first occurence of the line, case insensitive
> $found = false;
> while (!$found && list($key, $value) = each ($lines)) {
> if(strtolower($value) == strtolower($line_to_delete))
> {
> unset($lines[$key]);
> $found = true;
> }
>
> }
Thanks for the help. However, I am still having a little bit of
trouble with deleting a line from a txt
file. When i click on the hyper link that is matched to record?=
$count,
it still wont delete and append the details to the file...
here is the code that i am trying to implement. Are there any changes
i can make to this code to help me accomplish the task?
<?php
if(isset($_GET['record_id'])){
// Load the lines into an array; newlines are still attached
$line_to_delete = $_GET['record_id'];
$line=file("member.txt");
$found = false;
while(!$found && list($key, $value) = each($line)) {
if(strtolower($value) == strtolower($line_to_delete))
{
unset($line[$key]);
$found = true;
}
}
}
//Open the new file for writing
$lines_update = fopen("./member.txt", "w");
// 1. Join the array to a single string (newlines are already
attached)
// 2. Write the updated array to the new file
fwrite($lines_update, join("", $line));
// Close the file handle to allow other operations on the file
fclose($lines_update);
// Remove the old file
?>
Cheers,
Peri
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