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$arr=array(
array(1=>'A'), array(2=>'B'), array(3=>'C'), array(4=>'D'), array(5=>'A'), array(6=>'B'), array(7=>'C'), array(8=>'D'), );
$res=array();foreach ($arr as $key => $value) {
foreach ($value as $k => $v) { $res[$v][$k]=$v; }
}$res=array_values($res);echo "
";print_r($res);die();
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
$arr=array(
$res=array();
foreach ($arr as $key => $value) {
}
$res=array_values($res);
echo "
";print_r($res);die();