private function updateOrDelete($id, $data = null)
{
/* Thanks to https://www.daniweb.com/web-development/php/threads/102279/deleting-a-line-from-a-file#post1353582 */
/*
* Create a new SplFileObject representation of the file
* Open it for reading and writing and place the pointer at the beginning of the file
* @see fopen for additional modes
*/
$file = new \SplFileObject($this->filename, 'a+');
/*
* Set a bitmask of the flags to apply - Only relates to reading from file
* In this case SplFileObject::DROP_NEW_LINE to remove new line charachters
* and SplFileObject::SKIP_EMPTY to remove empty lines
*/
$file->setFlags(7);
/*
* Lock the file so no other user can interfere with reading and writing while we work with it
*/
$file->flock(LOCK_EX);
/*
* Create a SplTempFileObject
* 0 indicates not to use memory to store the temp file.
* This is probably slower than using memory, but for a large file it will be much more effective
* than loading the entire file into memory
* @see http://www.php.net/manual/en/spltempfileobject.construct.php for more details
*/
$temp = new \SplTempFileObject(0);
/*
* Lock the temp file just in case
*/
$temp->flock(LOCK_EX);
/*
* Iterate over each line of the file only loading one line into memory at any point in time
*/
foreach ($file as $key => $line) {
if ($key != $id) {
/*
* If this line does NOT match out delete write it to the temp file
* Append a line ending to it
*/
$temp->fwrite($line . PHP_EOL);
} else {
if ($data !== null) {
$temp->fwrite($data . PHP_EOL);
}
}
}
/*
* Truncate the existing file to 0
*/
$file->ftruncate(0);
/*
* Write the temp file back to the existing file
*/
foreach ($temp as $line) {
/*
* Iterate over temp file and put each line back into original file
*/
$file->fwrite($line);
}
/*
* Release the file locks
*/
$temp->flock(LOCK_UN);
$file->flock(LOCK_UN);
return true;
}
