Function to check if array is associative (key-value)

composer.json

{
    "name": "attitude/Functions/is_assoc_array",
    "autoload": {
        "files": ["function-is_assoc_array.php"]
    }
}

function-is_assoc_array.php

<?php

/**
 * Function to check if array is associative (key-value)
 *
 * @param   array  $array   Array to check
 * @param   bool   $speedy  Default true, pass false to use less memory
 * @returns bool            True if associative, false if sequential
 * @author                  Alix Axel <http://stackoverflow.com/users/89771/alix-axel>
 * @see                     http://stackoverflow.com/questions/173400
 * @license                 CC BY-SA 3.0) <http://creativecommons.org/licenses/by-sa/3.0/>
 *
 */
function is_assoc_array($array, $speedy=true)
{
    if ($speedy) {
        return ($array !== array_values($array));
    }

    // More memory efficient
    return $array = array_keys($array); return ($array !== array_keys($array));
}