<?php $array = ['coke.', 'fanta.', 'chocolate.', 'a.', 'b.', 'c.', 'd.']; $result = array_reduce($array, function($c, $i) { if ( strlen(end($c)) < 6 ) $c[key($c)] .= empty(current($c)) ? $i : " $i"; else $c[] = $i; return $c; }, ['']); print_r($result);
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