我有多个数组，如下面的数组
$in = array(array("","","111","1552"),array("102","","","1552"),array("102","123"," ","1552"),array("","123","",""));
需要这样的输出 "101","","111","1552"
使用 array_map 创建非空项的数组
$arr = array_map(function($a, $b) { return !empty($a) ? $a : $b; }, $array1, $array2 );
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我来说两句