Question

I have 100 txt files on my webserver. I have to insert a string e.g. abcdef on the beginning of all of them using php and save them back again. How is this possible ?

Answer 1

Look at opendir, glob, fopen, and fwrite. For example:

foreach (glob("*.txt") as $file) {
   $fh = fopen($file, 'c'); //Open file for writing, place pointer at start of file.
   fwrite($fh, 'abcdef');
   fclose($fh);
}