I just came across building a CRUD application in PHP, and the instructor was reminding us about the use of htmlentities() in order to avoid HTML injections, and he then goes to say that htmlentities shouldnt be called more than once in your code, my question is very simple...why?
Cheers
My Answer:
Calling htmlentities() more than once in your code can lead to double encoding of special characters. This means that certain characters will be converted to their HTML entity equivalents multiple times, which can result in unexpected behavior and display issues on your website.
It is recommended to call htmlentities() only once on user input before displaying it on your website. If you need to encode the same string multiple times for different purposes, consider storing the encoded string in a variable and reusing it instead of calling htmlentities() multiple times.
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