比較兩個陣列與array_diff

Question

我有下面的代碼，並試圖比較兩個數組與array_diff但是我一直沒有得到任何結果。我不確定它是否重要，但是陣列中有很多字段，我真的只想比較一個字段......這可能嗎？我錯過了什麼？

<?php 
$json = file_get_contents("http://ebird.org/ws1.1/data/obs/region/recent?rtype=subnational1&r=US-AZ&back=7&fmt=json"); 
$json2 = file_get_contents("http://ebird.org/ws1.1/data/obs/region/recent?rtype=subnational1&r=US-NV&back=7&fmt=json"); 

$array1 = json_decode($json, TRUE); 
$array2 = json_decode($json2, TRUE); 

if ($array1 == $array2) { 
echo 'There are no differences'; 
}else 
var_dump(array_diff($array2, $array1)); 
echo 'they are different'; 

?> 

Answer 1

您需要檢查陣列針對對方：

$Array_1 = array (1,2,3,4,5); 
$Array_2 = array(1,2,3,4,5,6); 

print_r(array_diff($Array_1,$Array_2)); 

將輸出：

Array 
(
) 

鑑於：

print_r(array_diff($Array_2,$Array_1)); 

將輸出：

Array 
(
    [5] => 6 
) 

所以這可能是一個解決辦法：

function ArrayDiff ($Array_1, $Array_2){ 
    $Compare_1_To_2 = array_diff($Array_1,$Array_2); 
    $Compare_2_To_1 = array_diff($Array_2,$Array_1); 
    $Difference_Array = array_merge($Compare_1_To_2,$Compare_2_To_1); 
    return $Difference_Array; 

} 

print_r(ArrayDiff($Array_1,$Array_2)); 

將輸出：

Array 
(
    [0] => 6 
) 

---

把這個變成一個if語句：

$Differences = ArrayDiff($Array_2,$Array_1); 
if (count($Differences) > 0){ 
    echo 'There Are Differences Between The Array:'; 
    foreach ($Differences AS $Different){ 
     echo "<br>".$Different; 
    } 

所有的例子並且代碼基於o FF在啓動（$ Array_1和$ Array_2）陣列

Answer 2

$po_line_array=array(); 
    $po_line_clone_array=array(); 

    foreach($cart->line_items as $line_no => $po_line) 
     $po_line_array[$line_no]=$po_line->labdip_details_id; 
     print_r($po_line_array,1); 
    foreach($cart->line_items_clone as $line_no_clone => $po_line_clone) 
     $po_line_clone_array[$line_no_clone]=$po_line_clone->labdip_details_id; 
     print_r($po_line_clone_array,1); 

    $result=array_diff($po_line_clone_array,$po_line_array); 
    print_r($result,1); 

輸出：

Array ([0] => 101) 

    Array ([0] => 101 [1] => 103) 

    Array ([1] => 103)