Check before insert in Database

hello everyone,

I would to know how to check the value I am getting from an HTML form.

Let's put it that way, I need to get a string and I would like to make sure
this is a string and not a number for instance.

What kind of test could I use to check that?

//here is the line where I get the value

$variable = $_POST['value'];

The point is I have to insert the data in an Oracle database. And I would
like to test it before sending the data to the database.

Any advice, please?


.

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