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Language/Type: PHP arrays array programming

Write a function named index_of that returns the index of a particular value in an array of integers. The function should return the index of the first occurrence of the target value in the array. If the value is not in the array, it should return -1.

For example, if an array called $arr stores the following values:

$arr = [42, 7, -9, 14, 8, 39, 42, 8, 19, 0];

Then the call index_of($arr, 8) should return 4 because the index of the first occurrence of value 8 in the array is at index 4. The call index_of($arr, 2) should return -1 because value 2 is not in the array.

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

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