- ctype_digit: documentation ( source)
- implode: documentation ( source)
- array_keys: documentation ( source)
- ksort: documentation ( source)
<?php
$assoc = array(
"a" => 1,
"b" => 0,
0 => 0
);
function is_assoc($array){
$sorted = ksort($array);
$sorted = array_keys($sorted);
return !ctype_digit(implode('', $sorted));
}
echo is_assoc($assoc);
?>