class HashTable{
private $buckets; //用于存储数据的数组
private $size = 12; //记录buckets 数组的大小
public function __construct(){
$this->buckets = new SplFixedArray($this->size);
//SplFixedArray效率更高，也可以用一般的数组来代替
}
private function hashfunc($key){
$strlen = strlen($key); //返回字符串的长度
$hashval = 0;
for($i = 0; $i<$strlen ; $i++){
$hashval +=ord($key[$i]); //返回ASCII的值
}
return $hashval%$this->size; // 返回取余数后的值
}
public function insert($key,$value){
$index = $this->hashfunc($key);
if(isset($this->buckets[$index])){
$newNode = new HashNode($key,$value,$this->buckets[$index]);
}else{
$newNode = new HashNode($key,null);
}
$this->buckets[$index] = $newNode;
}
public function find($key){
$index = $this->hashfunc($key);
$current = $this->buckets[$index];
echo "</br>";
var_dump($current);
while(isset($current)){ //遍历当前链表
if($current->key==$key){ //比较当前结点关键字
return $current->value;
}
$current = $current->nextNode;
//return $current->value;
}
return NULL;
}
}
class HashNode{
public $key; //关键字
public $value; //数据
public $nextNode; //HASHNODE来存储信息
public function __construct($key,$nextNode = NULL){
$this->key = $key;
$this->value = $value;
$this->nextNode = $nextNode;
}
}
$ht = new HashTable();
$ht->insert('key1','value1');
//$ht->insert('key12','value12');
echo $ht->find('key1');
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