Question: HTML/ PHP/XML I need to create additional code on a web pages so that they do not crash if an error is encountered, and that

HTML/ PHP/XML

I need to create additional code on a web pages so that they do not crash if an error is encountered, and that at the most, an acceptable error message is displayed, instead of the default error message one gets when the code crashes. I need to implement the error handling code to deal with any of the following three scenarios:

Input XML file unavailable

Cookie variable does not exist or cannot be created (user disabled cookies)

Invalid values inside cookie variable

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