PHP Code Check if Array is Associate Array

PHP Code Several Ways to Check if a PHP Array is an Associative Array

Here are several ways to check if an array is an associtive array or not. Note: this assumes the input $array is a flat or single dimensional array. If you need to check a multidimensional array. See the bottom textbox for how to do this.

# this answer is the most effective, bullet proof method for ensuring array is associative function isArrayAssociative($array): bool { return is_array($array) && array_keys($array) !== range(0, count($array) - 1); } function isArrayAssociative($array): bool { # get all keys of the array and count how many are strings $stringKeyCount = count(array_filter(array_keys($array), "is_string")); # check if the count of string keys matches the total number of keys return ($stringKeyCount === count($array)); }

If you need to check a multidimensional array and ensure all dimensions/levels are associative array you need to loop.

function isArrayAssociative(array $array): bool { # Check if the array has any non-sequential keys (associative) if (array_keys($array) !== range(0, count($array) - 1)) { return true; } # recursively check nested arrays foreach ($array as $value) { if (isArrayAssociative($value)) { return true; } } # return false if it's sequential in all levels return false; }