PHP Intermediate Quiz 5

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Quiz 5
1. Which function filters an array based on a callback function?
2. Which function applies a callback to every element of an array?
3. What is another name for an 'anonymous function' in PHP?
4. Which function is used to create a custom error handler?
5. What does the '??' operator do in PHP?
6. What is the result of ($a <=> $b) if $a is greater than $b?
7. Which function converts a PHP variable into a storable string representation?
8. How do you convert a serialized string back into a PHP variable?
9. How do you pass a variable by reference in a function signature?
10. What is the risk of using the 'global' keyword excessively?
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