how to write into a file?

[Anon]

I have the following code:
initial , memberID.txt is "0"

$files = fopen("memberID.txt", "rw");
$value = fgetc($files);
echo "value3 : $value" ;
settype ($value, "integer");
$value = $value + 1;
echo "value4 : $value";
fwrite($files, "$value");
fclose($files);

after running these code,
value3 is 0
value4 is 1
but in file "memberID.txt" still is "0".
What should I do?

[[deleted]]

Try this instead:

$files = fopen("memberID.txt", "rw");
$value = fgets($files,10);
fclose($files);

echo "value3 : $value" ;
settype ($value, "integer");
$value = $value + 1;
echo "value4 : $value";

$files = fopen("memberID.txt", "w");
fwrite($files, $value);
fclose($files);

Note: files are not multi-user safe. If you start running this script for several users at the same time, sh*t will start to fly. Consider using a database!

[jc94062]

couldn't you use flock to make it safe for multi-user access?

[[deleted]]

Yes you could, but that would be the same as putting a table-level-lock on a database: very slow. It will work if you have very few visitors, but when the load increases, this method is just too slow

[jc94062]

Ah, tkx for the info 🙂