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<?php
$filename = 'test.txt';
$somecontent = "Add this to the file\n";

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

  // In our example we're opening $filename in append mode.
  // The file pointer is at the bottom of the file hence
  // that's where $somecontent will go when we fwrite() it.
  if (!$handle = fopen($filename, 'a')) {
        echo "Cannot open file ($filename)";
        exit;
  }

  // Write $somecontent to our opened file.
  if (fwrite($handle, $somecontent) === FALSE) {
      echo "Cannot write to file ($filename)";
      exit;
  }
 
  echo "Success, wrote ($somecontent) to file ($filename)";
 
  fclose($handle);

} else {
  echo "The file $filename is not writable";
}
?>
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https://forums.phpfreaks.com/topic/14201-creating-a-new-file/#findComment-55679
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