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.
$myFile = "testFile.txt";
$fh = fopen($myFile, 'w');
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
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