Online PHP editor | refs for kQHQZ

<?php var_export(preg_split('~.{3}\K~', 'abcdefghijklm', 3)); echo "\n---\n"; var_export([preg_replace('~.{3}\K~','*', 'abcdefghijklm', 3, $count1), $count1]); echo "\n---\n"; var_export([preg_filter('~.{3}\K~', '*', 'abcdefghijklm', 3, $count2), $count2]); echo "\n---\n"; var_export(preg_grep('~.{3}\K~', ['abcdef', 'ghijklm'])); echo "\n---\n"; var_export(preg_match_all('~(.{3})\K~', 'abcdefghijklm', $m1) ? $m1 : null); echo "\n---\n"; var_export(preg_match_all('~.{3}\K~', 'abcdefghijklm', $m2) ? $m2 : null); echo "\n---\n"; var_export([preg_replace_callback('~.{3}\K~', function() { return '*'; }, 'abcdefghijklm', 3, $count3), $count3]);