Exercises
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What is the difference between an associative array and a multidimensional array?
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How many times should srand() be called?
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a) Once ever
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b) Once per script
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c) Once for every call to shuffle(), before the call
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d) Once for every call to shuffle(), after the call
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To safely pass an array over the web, what is the correct sequence of function calls:
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a) urlencode(), serialize(), unserialize(), urldecode()
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b) urldecode(), unserialize(), serialize(), urlencode()
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c) serialize(), unserialize(), urlencode(), urldecode()
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d) serialize(), urlencode(), urldecode(), unserialize()
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When passing a negative "step" parameter to the range() function, the initial value must always be larger than the end value: true or false?
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To randomise the order of an array, which function(s) can you use:
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a) shuffle()
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b) mt_shuffle()
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c) Both of the above
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d) Neither a) nor b)
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Which of the following statements are true about arrays that have a hole (e.g. it has keys 0, 1, 2, and 4):
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a) You can use foreach to loop through the array and ignore the hole
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b) You can use the array_values() function to re-order the keys
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c) You can use the arsort() function to re-order the keys
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d) All of the above
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