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@ 2015-11-13T13:45:05Z

<?php
// string, null, bool, float, largest specified previous index

function isIndexedArray($array) {
	return !(bool)count(array_filter(array_keys($array), 'is_string'));
}

print (isIndexedArray(null) === false);

Output
Performance
VLD
References
Branches

array_filter: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

42.03 ms | 402 KiB | 5 Q