usort（）排列

Question

後不工作

我的代碼如下

$results = array(); 
$results[] = json_decode("json api response url", true); 
$results[] = json_decode("json api response url 2", true); 
$results[] = json_decode("json api response url 3", true); 
foreach($results as $result) { 
    $decoded = $result['Info']; 
    usort($decoded, function($a, $b) { return $a['price'] > $b['price'] ? 1 : -1; }); 
    foreach($decoded as $row) { 
     echo $row['price']; 
    } 
} 

JSON數組如下返回

["Info"]=> 
[0]=> 
array(13) { 
    ["price"]=> 
    int(3000) 
} 
[1]=> 
array(13) { 
    ["price"]=> 
    int(5000) 

它做一個usort爲每json_decode效應初探，而不是所有的人都在一起，他們是否有辦法解決這個問題？

Answer 1

我想你想要做的是連接所有的JSON響應並將它們放在一起，而不是在結果[]中創建3個不同的數組元素;考慮array_merge（）：

$result = array(); 
$arr1 = json_decode("json api response url", true); 
$arr2 = json_decode("json api response url 2", true); 
$arr3 = json_decode("json api response url 3", true); 

$result = array_merge($arr1['Info'], $arr2['Info'], $arr3['Info']); 

$decoded = $result; 
usort($decoded, function($a, $b) { return $a['price'] > $b['price'] ? 1 : -1; }); 
foreach($decoded as $row) { 
    echo $row['price']; 
} 

Answer 2

您在數組中的每一項執行usort。嘗試在循環播放結果之前先執行usort。我不知道這是否可行，但它應該指向正確的方向。

$results = array(); 
$results[] = json_decode("json api response url", true); 
$results[] = json_decode("json api response url 2", true); 
$results[] = json_decode("json api response url 3", true); 

usort($results, function($a, $b) { 
    return $a['Info']['price'] > $b['Info']['price'] ? 1 : -1; 
}); 

foreach($results as $result) { 
    // do your looped stuff 
} 

Answer 3

$results = array(); 
$results[] = json_decode("json api response url", true); 
$results[] = json_decode("json api response url 2", true); 
$results[] = json_decode("json api response url 3", true); 

function cmp($a, $b) 
{ 
    if ($a == $b) { 
     return 0; 
    } 
    return ($a < $b) ? -1 : 1; 
} 

usort($results, "cmp"); 

foreach($results as $row) { 
    echo $row['price']; 
}