php: check if an array has duplicates

Question

I\'m sure this is an extremely obvious question, and that there\'s a function that does exactly this, but I can\'t seem to find it. In PHP, I\'d like to know if my array has

Answer 1

function hasDuplicate($array){
  $d = array();
  foreach($array as $elements) {
    if(!isset($d[$elements])){
      $d[$elements] = 1;
    }else{
      return true;
    } 
  } 
  return false;
}