<?php $str = "helloworld"; echo preg_replace('~.\L.~', ' ', $str); echo "\n---\n"; echo array_reduce(str_split($str, 2), function($carry, $item) { return $carry . $item[0] . (isset($item[1]) ? ' ' : ''); }); echo "\n---\n"; for ($offset = 1, $length = strlen($str); $offset < $length; $offset += 2) { $str[$offset] = ' '; } echo $str;
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