<?php $txt = "lookSTARTfromhereSTARTagainhere"; $arr = explode("START", $txt); // Explode on START unset($arr[0]); // first item is before START, we don't need that. $res = []; foreach($arr as $val){ $temp = str_split($val, 4); // Split array item on four letters. $res = array_merge($res, $temp); // merge the new array with result array } var_dump($res);
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