关于PHP比较数组相似度的方法

array_intersect_assoc带索引检查计算数组的交集

$sub_sql = 'select * from f_subject';

 $sub_quy = $db->select($sub_sql);

 $other_array = array(); #所有用户题目ID和答案数组

 $like_user = array();

 for($a=0;$a<count($sub_quy);$a++){

 if($sub_quy[$a]['id'] != $quy[0]['id']){

 $other_array = array('name'=>$sub_quy[$a]['name']); 

 $subject_array_a = explode(',',substr($sub_quy[$a]['subject'],0,strlen($sub_quy[$a]['subject'])-1));

 $answer_array = explode(',',substr($sub_quy[$a]['answer'],0,strlen($sub_quy[$a]['answer'])-1));

 for($o=0;$o<count($subject_array_a);$o++){ 

 $other_array += array($subject_array_a[$o]=>$answer_array[$o]); 

 }

 // echo '<pre>';

 #print_r($other_array);

 $inter_array = array_intersect_assoc($other_array,$mage_array);

 $count_inter = count($inter_array);

 if($count_inter >= 3){

 $like_user += array($other_array['name']=>$count_inter);

 }

 }

 // echo $count_inter;

 // echo '</pre>'; 

 }