php man page for rewind

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)