<?php $arr = array('a', 'b', 'c', 'd', 'e', 'f'); //$str = implode(array_walk(array_reverse($arr), function($v,$k){if($k%3==0)$v.=';';})); print_r(array_walk(array_reverse($arr), function($v,$k){if($k%3==0)$v.=';';})); //echo $str;
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