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<p>The next array item gets the index 15:</p>
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$cars[5] = "Volvo";
$cars[7] = "BMW";
$cars[14] = "Toyota";
array_push($cars, "Ford");
var_dump($cars);
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The next array item gets the index 15:
array(4) { [5]=> string(5) "Volvo" [7]=> string(3) "BMW" [14]=> string(6) "Toyota" [15]=> string(4) "Ford" }