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$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";
array_push($cars, "Ford");
var_dump($cars);
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array(4) { [0]=> string(5) "Volvo" [1]=> string(3) "BMW" [2]=> string(6) "Toyota" [3]=> string(4) "Ford" }