- fwrite: documentation ( source)
- rewind: documentation ( source)
- fread: documentation ( source)
- fopen: documentation ( source)
<?php
$a = fopen('php://temp', 'r+');
$b = fopen('php://temp', 'r+');
fwrite($a, 'aaa');
fwrite($b, 'bbb');
rewind($a);
rewind($b);
echo fread($a, 6);
echo '-';
echo fread($b, 6);