The SplFileObject::ftruncate() function is an inbuilt function of Standard PHP Library (SPL) in PHP which is used to truncates the file size in bytes.
Syntax:
bool SplFileObject::ftruncate( $length )
Parameters: This function accept single parameter $length which specified the length of truncate of the file.
Return values: This function returns True on success or False on failure.
Below Programs illustrate the SplFileObject ftruncate() function in PHP:
Program 1:
<?php   // Create a file named "gfg.txt" which // containing data "neveropen" $gfg = new SplFileObject("gfg.txt", "w+"); $gfg->fwrite("neveropen");   // Truncate file $gfg->ftruncate(8);   // Rewind and reading data from file $gfg->rewind();   // Print result after truncate echo $gfg->fgets(); ?> |
Output:
Geeksfor
Program 2:
<?php    // Create an Array $GFG = array(     "dummy.txt",     "gfg.txt",     "frame.txt"    );    // Creating Spl Object foreach ($GFG as &$arr) {     $file = new SplFileObject($arr);            // Truncate file     $file->ftruncate(8);            // Rewind and reading data from file     $file->rewind();            // Print result after truncate     echo $file->fgets(); } ?> |
Output:
Geeksfor Contribu Article
Reference: http://php.net/manual/en/splfileobject.ftruncate.php
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