PHP/File Directory/File Write

Write content to file

<?php 
$cfile = "test.txt";
$fh = @fopen($cfile, "r+") or die("<BR>Failed to open file <I>$cfile</I>.");
@flock($fh, LOCK_EX)  or die("<BR>Could not lock file <I>$cfile</I>.");
$s = @fgets($fh, 6);
$count = (int) $s + 1;
$count = str_pad($count, 6);
@rewind($fh)  or die("<BR>Failed to rewind file <I>$cfile</I>.");
if (@fwrite($fh, $count) == -1) {
    die("<BR>Failed to write to file <I>$cfile</I>.");
}
echo "$count";
@flock($fh, LOCK_UN) or die("<BR>Could not unlock file <I>$cfile</I>.");
fclose($fh) or die("<BR>Failed to close file <I>$cfile</I>.");
?>

Writing and Appending Content in a File

 <?php
  $myfile = "./test.txt";
  $openfile = fopen ($myfile,"w") or die ("Couldn"t open the file");
  
  fwrite ($openfile,"This is a string \n");
  fclose ($openfile);
  
  $openfile = fopen ($myfile,"r") or die ("Couldn"t open the file");
  $file_size=filesize($myfile);
  $file_contents = fread ($openfile,$file_size);
  $msg ="$file_contents";
  fclose ($openfile);
  echo $msg;
  ?>