PHP SplFileObject fflush() Function - Coding

The SplFileObject::fflush() function is an inbuilt function in the Standard PHP Library (SPL) in PHP that is used to flush the output buffer of the file.

Syntax:

public SplFileObject::fflush():bool

Parameter: This function does not accept any parameters.

Return Value: The SplFileObject::fflush() function returns “true” if the function successfully flushes the output buffer of the file otherwise, this function will return “false”.

Program 1: The following program demonstrates the SplFileObject::flush() function. The “output.txt” should be available in the same folder.

PHP

<?php 
  
$file = new SplFileObject("output.txt", "w"); 
  
$data = "This is some data that will be written to the file.\n"; 
  
$file->fwrite($data); 
  
// Flush the data to the file immediately 
if ($file->fflush()) { 
    echo "Data flushed successfully to the file."; 
} else { 
    echo "Failed to flush data to the file."; 
} 
  
?>

Output:

Data flushed successfully to the file.

Program 2: The following program demonstrates SplFileObject::flush() function. The “output.txt” should be available in the same folder.

PHP

<?php 
  
$file = new SplFileObject("output.txt", "w"); 
  
$dataLines = [ 
    "Line 1: This is the first line of data.\n", 
    "Line 2: This is the second line of data.\n", 
    "Line 3: This is the third line of data.\n", 
]; 
  
foreach ($dataLines as $line) { 
      
    // Write the line to the file 
    $file->fwrite($line); 
  
    // Flush the data to the file 
    // immediately after writing each line 
    if ($file->fflush()) { 
        echo "Data flushed successfully for line: " . $line; 
    } else { 
        echo "Failed to flush data for line: " . $line; 
    } 
} 
  
?>

Output:

Data flushed successfully for line: Line 1: This is the first line of data.
Data flushed successfully for line: Line 2: This is the second line of data.
Data flushed successfully for line: Line 3: This is the third line of data.

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

Reffered: https://www.geeksforgeeks.org

PHP

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