PHP SplFileObject fflush() Function
Last Updated :
04 Oct, 2023
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 );
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 ) {
$file ->fwrite( $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
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