How to check if PHP array is associative or sequential?

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PHP treats all arrays as associative, so there aren’t any built in functions. Can anyone recommend a fairly efficient way to check if an array “is a list” (contains only numeric keys starting from 0)?

Basically, I want to be able to differentiate between this:

$sequentialArray = [
    'apple', 'orange', 'tomato', 'carrot'
];

and this:

$assocArray = [
    'fruit1' => 'apple',
    'fruit2' => 'orange',
    'veg1' => 'tomato',
    'veg2' => 'carrot'
];

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