Like I said before, if you really need to use PHP code in the text area, I suggest you use a shortcode instead. Please check the links I gave you before regarding shortcode. After that, you can execute the shortcode by using the do_shortcode() function like this:
Instead of like this:
If you don’t mind about the security of your site, you can always use eval() function to execute the string. Please keep in mind that I have warned you that it is a really bad idea to execute a string.
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