PHP fflush() Function

The fflush function is used to write all the buffered output to an already opened file. It flushes the output to file.

Syntax

Parameters

Parameter	Description	Required/Optional
file	Specifies the open file stream to check	required

Returns

It returns true on success and false on failure.

Example 1

<?php
$file1 = fopen("source.txt", ?r+?);
// some code
fflush($file1);
?>

Example 2

<?php
$files = 'source.txt';
$file1 = fopen($files, 'r+');
rewind($file1);
fflush($file1);
ftruncate($file1, ftell($file1));
fclose($file1);
?>

Note : to handle it ,file pointer must be valid.

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