PHP | SplFileObject ftruncate() Function

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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 "zambiatek" 
$gfg = new SplFileObject("gfg.txt", "w+"); 
$gfg->fwrite("zambiatek"); 
  
// 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
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Reference: http://php.net/manual/en/splfileobject.ftruncate.php

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