PHP | SplFileObject fwrite() Function

Last Updated : 11 Jul, 2025
The SplFileObject::fwrite() function is an inbuilt function of Standard PHP Library (SPL) in PHP which is used to write to the file. Syntax: 
int SplFileObject::fwrite( $str, $length )
Parameters: This function accept two parameters as mention above and describe below:
  • $str: It is used to specify the string which need to write to the file.
  • $length: It is an optional parameter. If it is given then file writing will stop after a specified length.
Return values: This function returns the number of bytes written to the file and 0 on error. Below Programs illustrate the SplFileObject::fwrite() function in PHP: Program 1: php 
<?php

// Create a file named "gfg.txt" if not exist
$gfg = new SplFileObject("gfg.txt", "w+");

// Write data in gfg.txt
$gfg->fwrite("GeeksforGeeks a CS Portal");

// Open file again in read mode
$gfg = new SplFileObject("gfg.txt");

// Print result after written
while (!$gfg->eof()) {
    echo $gfg->fgetc();
}
?>
Output: 
GeeksforGeeks a CS Portal
Program 2: php 
<?php
 
// Create an Array
$GFG = array(
    "dummy.txt",
    "gfg.txt",
    "frame.txt"
    );
 
// Creating Spl Object
foreach ($GFG as &$arr) {
    $gfg = new SplFileObject($arr, "w+");
     
    // Write data in file
    $gfg->fwrite("GeeksforGeeks a CS Portal for Geeks");
     
    // Open file again in read mode
    $gfg = new SplFileObject("gfg.txt");
     
    // Print result after written
    while (!$gfg->eof()) {
        echo $gfg->fgetc();
    }
    
    echo  "</br>";
}
?>
Output: 
GeeksforGeeks a CS Portal for Geeks
GeeksforGeeks a CS Portal for Geeks
GeeksforGeeks a CS Portal for Geeks
Reference: https://www.php.net/manual/en/splfileobject.fwrite.php
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