PHP : Check if variable is an associative array

In this  tutorial learn how to Check if variable is an associative array in php using is_array() and array_keys() - programming technology world

function is_associative_array($var): bool
{
    if (!is_array($var)) {
        return false;
    }
    
    $keys = array_keys($var);
    return ($keys !== array_keys($keys));
}

TUTORIAL

<?php 

/**
 * Check if variable is an associative array.
 *
 * @param array|mixed $var
 * @return bool
 */
$b=array('id'=>1,'user'=>1);

function is_associative_array($var): bool
{
    if (!is_array($var)) {
        return false;
    }
    
    $keys = array_keys($var);
    return ($keys !== array_keys($keys));
}
var_dump(is_associative_array($b));

OUTPUT : DEMO

bool(true)