- preg_replace: documentation ( source)
- sprintf: documentation ( source)
- printf: documentation ( source)
<?php
echo sprintf('%.4d %.4f', 0xFF, 0xFF);
echo printf("\n%d and %.2f makes %o", 4+7,4/7,47);
echo preg_replace('/(\w+) (\w+)/','\0, \2, \1'. 'Rodrigo Capile');