PHP 部分函数说明

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explode(',', $res)将字符串转换成一维数组
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implode(',', $res)将一维数组转换成字符串
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array_filter($res)过滤空的一维数组
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array_values($res)重置键名
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//将一维数组转换成二维数组
$test_three = array();
foreach ($test_two as $k => $v) {
    $test_three[] = array('img' => $v);
}
//+------------------------------------------------------
//+-------------------------------------------------------
//二维数组转一维
$user_array = array();
foreach ($user as $k => $v) {
    $user_array[] = $v['id'];
}
//+-------------------------------------------------------
//+--------------------------------------------------------
unset($user[$k]);//抛出数组中不需要的
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