- print_r: documentation ( source)
- preg_replace: documentation ( source)
- setlocale: documentation ( source)
<?php
print_r(preg_replace('#\w#u', '<|$0|>', 'пхп')) . PHP_EOL;
echo PCRE_VERSION . PHP_EOL;
echo setlocale(LC_ALL, 0);
//print_r(preg_last_error());