PHP JSON解碼ingnore重複值

Question

PHP JSON解碼，如何ingore重複值？在我的情況下，如果$data->a和$data->b是重複的，只打印第一個出現的值。

[ 
{"a":"1","b":"2","c":"content1"}, 
{"a":"1","b":"3","c":"content2"},//print 
{"a":"1","b":"3","c":"content3"},//duplicate "a":"1","b":"3", do not print 
{"a":"2","b":"1","c":"content4"}, 
{"a":"2","b":"2","c":"content5"},//print 
{"a":"2","b":"2","c":"content6"},//duplicate "a":"2","b":"2", do not print 
{"a":"2","b":"3","c":"content7"} 
] 

這不是一件容易的array_unique()可以工作，請求幫助，謝謝。

Answer 1

使用散列數組！

$tmp=json_decode($input); 
$data=array(); 
foreach ($tmp as $item) { 
    $idx=$item->a."::".$item->b; 
    if (!isset($data[$idx])) $data[$idx]=$item; 
} 
$data=array_values($data);