有一种防弹的方法可以检测php字符串中的base64编码吗?

I am currently working on a Website where I have mixed values stored in my db and I'd like to find a solution to detect a string for base64 encryption or not. I've come up with this piece of code so far with help from Abhinav bhardwaj on this post (I am currently working on a Website where I hav