File Truncate
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When you open a file for writing with option 'w' it completely wipes all data from that file.
This action is also referred to as "truncating" a file.
Truncate literally means to shorten.
File Open: Truncate
To erase all the data from a file we need to open the file for normal writing.
All existing data within the file will be lost.
PHP Code:
$myFile = "testFile.txt";
$fh = fopen($myfile, 'w');
fclose($fh);
$fh = fopen($myfile, 'w');
fclose($fh);
Truncate: Why Use It
Truncating is most often used on files that contain data that will only be used for a short time.
These type of files are most often referred to as temporary files.
Note
For more detail please see Php Manual at http://www.php.net