php function to ensure array is serially indexed

[guillermobytes]

hi,

I need to know if there is a built in php function that can tell me whether an array is serially indexed or not.
i.e. that all the keys range from 0 to ($count - 1)
I could use a for loop, but I would prefer a built in function (internally written in C).
so any one knows?

thanks

[Markus]

I don't believe there is. Can you explain in what context you'd need this functionality?

[Dormilich]

if everything else fails, you still could use each/foreach

[guillermobytes]

hi,

I need to know if there is a built in php function that can tell me whether an array is serially indexed or not.
i.e. that all the keys range from 0 to ($count - 1)
I could use a for loop, but I would prefer a built in function (internally written in C).
so any one knows?

thanks

function isNumericallyIndexed($arr)
{
    return array_keys($arr) === range(0, count($arr) - 1);
}

[Dormilich]

there are classes, that make sure you create an "array" with only numerical indices: SplFixedArray & SplDoublyLinked List. though they’re nor suited to test an arbitrary array.