PHP | SplFileObject fwrite() Function

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

// 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

// 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: http://php.net/manual/en/splfileobject.fwrite.php