How to delete a line in a text file.

[Sjodahl]

Hi!

How do i delete a line in a text file with php??

===== TEXT FILE =====
banid 0.0 2986
banid 0.0 26447
banid 0.0 2491277
banid 0.0 506654
banid 0.0 1100466
banid 0.0 264444 //WANT TO DELETE THIS LINE
banid 0.0 16646
banid 0.0 551301
banid 0.0 2021343
banid 0.0 1556617
banid 0.0 3195174
===== END =========

[mogster]

I usually compile a new filecontent, and in the process omits what is comparable with input:

## to replace ##
$to_replace = " banid 0.0 264444";

$farr = file($filename, "r");
for($i=0;$i<sizeof($farr);$i++) {
if($farr[$i] != "" && $farr[$i] != $to_replace) {
$newstring .= $farr[$i] . "\n";
}
}
$fp = fopen($filename, "w");
$fw = fwrite($fp, $newstring);
fclose($fp);

knutm

[Sjodahl]

Can't get it to work.

=== FILE LOOK LIKE ===
Johan
test
arne
olle
== CODE LOOK LIKE ==

<?php

to replace

$to_replace = "test";
$filename = "C:\bannad.txt"; // THIS IS CORRECT FILE
$farr = file($filename, "r");
echo $farr[0]; // DOSENT PRINT ANYTHING
for($i=0;$i<sizeof($farr);$i++) {
if($farr[$i] != "" && $farr[$i] != $to_replace) {
$newstring .= $farr[$i] . "\n";
}
}
$fp = fopen($filename, "w");
$fw = fwrite($fp, $newstring);
fclose($fp);
?>

[xblue]

I wouldn't even have expected this to execute without error, since file() expects either one parameter (the filename), or an additional int value.

Remove the "r" argument. I'd also try using the relative path if it still doesn't work.

[edit: or maybe a double backslash would be needed in your absolute path? well, try it...]

[benjy]

how do you aquire the "banid" number...is there a program that does it....doo you guess it....or does php do it?

[Sjodahl]

Hi!

The BannID i get from a counter-strike server. When i bannad someone from the server it writes it to the file. So i want to unbann a people (remove it from a homepage).

===== NEW CODE =====
<?php

to replace

$to_replace = "test";
$filename = "bannad.txt";

$farr = file($filename);
//echo "\n$farr[0]";

if($farr[0] == $to_replace){
echo "TEST";
}
for($i=0;$i<sizeof($farr);$i++) {
if($farr[$i] !="" && $farr[$i] != $to_replace) {
$newstring .= $farr[$i] . "\n";
}
}
$fp = fopen($filename, "w");
$fw = fwrite($fp, $newstring);
fclose($fp);
?>

====== NEW result ======

Johan

[xblue]

oh, one more thing: when you use file(), the linebreak itself still is contained in each array element.

therefore you might want to use trim($farr[$i]) in your comparison.

[matto]

in a nutshell, technically:

if you want to delete one line of a file, you have to

1. be able to clearly identify which line, either by a key at the beginning of the line or by its line number
2. read in the entire file into an array (function: file), elimininate the line and overwrite the existing file with the new version

(ad 2.: read in the "old file" array, copy each line into a "new file" array in a loop, skipping the line which you want removed, then write the new file array to disk)

see reference for these functions on php.net:
file (for reading); fopen, fwrite, fclose (for writing)
maybe also: implode, explode, strpos for array handling and searching

whoops, quite a big nutshell 🙂