PHP - File Truncate
As we have mentioned before, when
you open a file for writing with
the paramater 'w' it completely
wipes all data from that file.
This action is also referred to
as "truncating" a file.
Truncate literally means to shorten.
PHP - File Open: Truncate
To erase all the data from our
testFile.txt file we need to open
the file for normal writing. All
existing data within testFile.txt
will be lost. PHP
Code:
$myFile = "testFile.txt";
$fh = fopen($myFile, 'w');
fclose($fh);
PHP - Truncate: Why Use It?
Truncating is most often used
on files that contain data that
will only be used for a short
time, before needing to be
replaced. These type of files are
most often referred to as
temporary files.
For example, you could create
an online word processor that
automatically saves every thirty
seconds. Every time it saves it
would take all the data that
existed within some HTML form text
box and save it to the server.
This file, say tempSave.txt, would
be truncated and overwritten with
new, up-to-date data every thirty
seconds.
This might not be the most
efficient program, but it is a
nice usage of truncate.
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