PHP SplFileObject fpassthru() Function

The SplFileObject::fpassthru() is an inbuilt function in PHP that is used to output the contents of a file to the output buffer, typically the browser, without reading the entire file into memory. It allows you to efficiently stream the contents of a file in smaller chunks, which is particularly useful for working with large files.

Syntax:

public SplFileObject::fpassthru(): int

Parameters: This function does not have any parameters.

Return Value: This function returns the number of characters from the buffer.

Program 1: The following program demonstrates SplFileObject::fpassthru() function.

Note: Before running this program save this file as "data.txt"

John,Doe,25
Jane,Smith,30
Alice,Johnson,28

<?php
   
$file = new SplFileObject('data.txt', 'r');
$file->fpassthru();

?>

Output:

John,Doe,25
Jane,Smith,30
Alice,Johnson,28

Program 2: The following program demonstrates SplFileObject::fpassthru() function.

<?php

$filePath = 'output.txt';

// Check if the file exists
if (file_exists($filePath)) {
    $file = new SplFileObject($filePath, 'r');   
    
      // Output the file content to the browser
    $file->fpassthru();
} else {
       // Handle the case when the file doesn't exist
    echo "File not found.";
} 

?>

Output:

hey Geeks for Geeks 

Reference: https://www.php.net/manual/en/splfileobject.fpassthru.php