The holy grail of cleaning input and output in php?

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No, there isn’t.

Different modes of escaping are for different purposes. You cannot universally escape something.

For Databases: Use PDO with prepared queries

For HTML: Use htmlspecialchars()

For JSON: json_encode() handles this for you

For character sets: You should be using UTF-8 on your page. Do this, and set your databases accordingly, and watch those issues disappear.

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