- var_dump: documentation ( source)
- is_numeric: documentation ( source)
- implode: documentation ( source)
- array_keys: documentation ( source)
<?php
$numeric = ['foo', 'bar', 'qux'];
$assoc = ['foo' => 'something', 'bar' => 'else', 'qux' => 'ya'];
function isNumericKey(array $array) {
return is_numeric(implode(array_keys($array)));
}
var_dump(isNumericKey($numeric));
var_dump(isNumericKey($assoc));