PHP fflush() Function
The PHP fflush() function writes all buffered output to an open file.
Syntax
fflush(stream)
Parameters
stream |
Required. Specify the file pointer to write the buffered output to. It must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()). |
Return Value
Returns true on success or false on failure.
Example:
Lets assume that we have a file called test.txt. This file contains following content:
This is a test file. It contains dummy content.
In the example below, fflush() function is used to writes buffered output to this file.
<?php
$filename = 'test.txt';
$fp = fopen($filename, 'r+');
//set the file position to the start
rewind($fp);
//write 'Hello World!' at start
fwrite($fp, 'Hello World!');
fflush($fp);
//truncate rest of the content
ftruncate($fp, ftell($fp));
//close the file
fclose($fp);
//checking the content of the file
$fp = fopen("test.txt", "r");
while(!feof($fp)) {
echo fgets($fp);
}
fclose($fp);
?>
The output of the above code will be:
Hello World!
❮ PHP Filesystem Reference
