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<?php $str = 'i need healing'; function matrix($input) { $inputIdx = str_split($input); $inputLen = strlen($input); for ($i = 0; $i < $inputLen; $i++) { for ($j = 0; $j < $inputLen; $j++) { $key = $i + $j; if (!array_key_exists($i+$j, $inputIdx)) { $key -= $inputLen; } echo $inputIdx[$key]; } echo PHP_EOL; } } matrix($str);
Output for git.master, git.master_jit, rfc.property-hooks
i need healing need healingi need healingi eed healingi n ed healingi ne d healingi nee healingi need healingi need ealingi need h alingi need he lingi need hea ingi need heal ngi need heali gi need healin

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