PHP数组_udiff（）未按预期工作

我试图用另一个数组的前三个字段检查数组的前三个字段，以获得唯一值。（假设由三列组成的主键想要添加表中不存在的行）

这是到目前为止我的代码

function udiffanswers($a, $b) {   
    if ($a['aid']==$b['aid'] && $a['qid']==$b['qid'] && $a['sid']==$b['sid']){
        return 0
    } else {
        return -1
    }
}

我的一个数组x具有值（459458,0461541），而我的另一个数组y具有相同的值，并且没有正确地排除它。此外，如果y具有值（459458,1461541），则不应排除它，因为它作为一个整体是唯一的

示例数据将是

$a

的

  [1] => Array
    (
        [aid] => 10
        [qid] => 10
        [sid] => 10
        [freetext] => sq file
        [a] => hi
        [b] => 
        [c] => 
        [d] => 
        [e] => 
        [f] => 
        [g] => 
        [h] => 
        [i] => 
        [j] => 
        [type] => freetext
        [location] => 
    )

[2] => Array
    (
        [aid] => 10
        [qid] => 1
        [sid] => 10
        [freetext] => diff
        [a] => diff
        [b] => diff
        [c] => diff
        [d] => diff
        [e] => diff
        [f] => diff
        [g] => diff
        [h] => diff
        [i] => diff
        [j] => diff
        [type] => diff
        [location] => diff
    )

[23] => Array
    (
        [aid] => 10
        [qid] => 2
        [sid] => 10
        [freetext] => adfadf
        [a] => adfadf
        [b] => adfadf
        [c] => adfadf
        [d] => adfadf
        [e] => adfadf
        [f] => adfadf
        [g] => adfadf
        [h] => adfadf
        [i] => adfadf
        [j] => adfadf
        [type] => adfadf
        [location] => adfadf
    )
   [50] => Array
    (
        [aid] => 10
        [qid] => 10
        [sid] => 10
        [freetext] => sq file
        [a] => hi
        [b] => 
        [c] => 
        [d] => 
        [e] => 
        [f] => 
        [g] => 
        [h] => 
        [i] => 
        [j] => 
        [type] => freetext
        [location] => 
    )

$b

已

  [1] => Array
    (
        [aid] => 10
        [qid] => 10
        [sid] => 10
        [freetext] => sq file
        [a] => hi
        [b] => 
        [c] => 
        [d] => 
        [e] => 
        [f] => 
        [g] => 
        [h] => 
        [i] => 
        [j] => 
        [type] => freetext
        [location] => 
    )

[2] => Array
    (
        [aid] => 10
        [qid] => 1
        [sid] => 10
        [freetext] => diff
        [a] => diff
        [b] => diff
        [c] => diff
        [d] => diff
        [e] => diff
        [f] => diff
        [g] => diff
        [h] => diff
        [i] => diff
        [j] => diff
        [type] => diff
        [location] => diff
    )

[23] => Array
    (
        [aid] => 10
        [qid] => 2
        [sid] => 10
        [freetext] => adfadf
        [a] => adfadf
        [b] => adfadf
        [c] => adfadf
        [d] => adfadf
        [e] => adfadf
        [f] => adfadf
        [g] => adfadf
        [h] => adfadf
        [i] => adfadf
        [j] => adfadf
        [type] => adfadf
        [location] => adfadf
    )
   [50] => Array
    (
        [aid] => 10
        [qid] => 10
        [sid] => 10
        [freetext] => sq file
        [a] => hi
        [b] => 
        [c] => 
        [d] => 
        [e] => 
        [f] => 
        [g] => 
        [h] => 
        [i] => 
        [j] => 
        [type] => freetext
        [location] => 
    )

---

应该从

$a

返回

数组[2]

，但它也返回重复的数组

从数组中切片前三个元素并比较它们

$newA = array_splice($a,0,3);
$newB = array_splice($b,0,3);

print_r(array_diff_assoc($newA, $newB));

---

请发布您的示例数据和所需结果返回（$a['aid']-$b['aid']）&&（$a['qid']-$b['qid']）&（$a['sid']-$b['sid']）；将返回TRUE或FALSE。在上面发布了一些示例数据