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The next array item gets the index 16:
array(4) { [15]=> string(5) "Volvo" [7]=> string(3) "BMW" [14]=> string(6) "Toyota" [16]=> string(17) "Ford" }
Note: the character length of item [16] should be 4. I added <mark> and </mark> to the code to highlight item [16]. This increased the character length of item [16] to 17.