Preventing php injection in forms (if a user submits php code into a form)?

No. Use htmlspecialchars instead. Don't use addslashes .

Use htmlspecialchars before outputing anything provided by the user. But in this case, also make sure that you do not execute anything the user inputs. Do not use eval, include or require.

If you save the user data to a file, use readfile or file_get_contents+htmlspecialchars instead of include/require. If you're using eval, change it into echo and so on.

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