How to check if an element has a specific parent?

Question

PHP

Good afternoon, tell me, please. There is this static markup:

<div>
  <a href="1.png">
    <img src="1.png">
  </a>
  <a href="2.png">
    <img src="2.png">
  </a>
  <img src="3.png">
</div>

That is, there are three pictures, two of them are wrapped in links. You need to write code that checks that each picture of this block has a parent with the "a" tag. If some image does not have such a parent, then it is wrapped in "a" and the src of the image is assigned as href. I know how to wrap, and how to assign href. The main thing that is needed is a check for the existence of a parent with the given "a" tag. How to do it? In order not to re-wrap images in links that are already wrapped in them.

Answer 1

Use PDO

Answer 2

Given that you have saved it to the database, and not executed, there is already some kind of protection there.
And if on business, then use prepared statements and PDO.

Answer 3

Screen incoming data.

Answer 4

If I were a doctor of technical sciences, I would recommend you a permanent indefinite ip ban for these script-kids, from nerves, so to speak =)
Catching them with the words SELECT, UPDATE or INSERT in the incoming data is not difficult.

Answer 5

I agree with the previous guys - if the connector is self-written, then you need to screen the data included in the request. But, IMHO, to escape not words, but symbols for sql: semicolon, single and double quotes and something else - because I had it for a long time, and it's easy to google.

Answer 6

$('a+img')?
or even better $('div > a') and then wrap