fflush(3) [php man page]

FFLUSH(3)								 1								 FFLUSH(3)

fflush - Flushes the output to a file

SYNOPSIS

       bool fflush (resource  $handle)

DESCRIPTION

	This function forces a write of all buffered output to the resource pointed to by the file $handle.

PARAMETERS

	      o $handle
		-The  file  pointer must be valid, and must point to a file successfully opened by fopen(3) or fsockopen(3) (and not yet closed by
		fclose(3)).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      File write example using fflush(3)

	      <?php
	      $filename = 'bar.txt';

	      $file = fopen($filename, 'r+');
	      rewind($file);
	      fwrite($file, 'Foo');
	      fflush($file);
	      ftruncate($file, ftell($file));
	      fclose($file);
	      ?>

SEE ALSO

       clearstatcache(3), fwrite(3).

PHP Documentation Group 														 FFLUSH(3)

REWIND(3)								 1								 REWIND(3)

rewind - Rewind the position of a file pointer

SYNOPSIS

       bool rewind (resource  $handle)

DESCRIPTION

	Sets the file position indicator for $handle to the beginning of the file stream.

       Note

	       If you have opened the file in append ("a" or "a+") mode, any data you write to the file will always be appended, regardless of the
	      file position.

PARAMETERS

	      o $handle
		- The file pointer must be valid, and must point to a file successfully opened by fopen(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      rewind(3) overwriting example

	      <?php
	      $handle = fopen('output.txt', 'r+');

	      fwrite($handle, 'Really long sentence.');
	      rewind($handle);
	      fwrite($handle, 'Foo');
	      rewind($handle);

	      echo fread($handle, filesize('output.txt'));

	      fclose($handle);
	      ?>

	      The above example will output something similar to:

	      Foolly long sentence.

SEE ALSO

       fread(3), fseek(3), ftell(3), fwrite(3).

PHP Documentation Group 														 REWIND(3)