- print_r: documentation ( source)
- preg_match_all: documentation ( source)
- setlocale: documentation ( source)
<?php
preg_match_all('#\bпхп|php\b#u', 'пхп php', $m);
print_r($m);
echo PCRE_VERSION;
echo setlocale(LC_ALL, 0);
//print_r(preg_last_error());