str_replace

[lemist]

I\'m trying to use str_replace in a weblog updater that i\'m writing to delete users from userlist.txt. It tells me that the length of the needle must not be zero. here\'s the code, please help.

$open = fopen(\"userlist.txt\", \"r\");
$saved = fread($open, filesize(\"userlist.txt\"));
fclose($open);

$towrite = str_replace(\"$username[$todelete]\", \"\", $saved);

$open = fopen(\"userlist.txt\", \"w\");
fwrite($open, $towrite);
fclose($open);

[Anon]

first off, check your variables. it seems that your "$username[$todelete]" might be null

try:

if(!isset($username[$todelete]))
echo "User doesn't exist!";

also, check the spelling, of the variables.
I had a similar problem that i couldn't fine that turned up to be a mistake in the spelling of a variable. something so small, but perfectly legal to php. there is a down side to being able to spontaniously declare variables.

[thepriest]

retry with quoting the needle, it doesn't look like its needed here, I may or may not be right.

$towrite = str_replace($username[$todelete], \"\", $saved);

hope this helps, stef

[lemist]

$username[$towrite] is inherited from the prvious page, i use a for loop to generate links that have the value of todelete in it:

echo("Select user to delete<br><br>\n");
for( $i = 1; $i <= $saved; $i++ ) {
echo("<a href=\"deleteuser.php?todelete=$i\">$username[$i]</a><br>\n");
};