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intersect

Language/Type: PHP arrays

Write a function named intersect that accepts references to two sorted arrays of numbers as parameters and returns a new array that contains only the elements that are found in both arrays. For example, if the following arrays are declared:

  • $a1 = [1, 4, 8, 9, 11, 15, 17, 28, 41, 59]
  • $a2 = [4, 7, 11, 17, 19, 20, 23, 28, 37, 59, 81]

Then the call of intersect($a1, $a2) should return the array: [4, 11, 17, 28, 59].

You can assume that both array passed store their elements in sorted order. You may assume that the arrays passed both contain only number elements and are non-null. Do not modify the two arrays passed in as parameters.

Function: Write a PHP function as described, not a complete program.

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