Question

我的数据是从客户端的CMS中提取的，但我的结果却很奇怪

print_r($appliance_data);
foreach ($appliance_data as $adKey => $adValue) {
    print_r($adKey);
    print_r($adValue);
    print_r(array_key_exists($adKey, $appliance_data));
    print_r(isset($appliance_data[$adKey]));
}

带输出

Array
(
    [94] => stdClass Object
        (
            [operation] => 0
            [value] => 0
        )

    [102] => stdClass Object
        (
            [operation] => 501
            [value] => 4
        )

    [90] => stdClass Object
        (
            [operation] => 0
            [value] => 0
        )
)
94
stdClass Object
(
    [operation] => 0
    [value] => 0
)
(boolean) FALSE
(boolean) FALSE
102
stdClass Object
(
    [operation] => 501
    [value] => 4
)
(boolean) FALSE
(boolean) FALSE
90
stdClass Object
(
    [operation] => 0
    [value] => 0
)
(boolean) FALSE
(boolean) FALSE

知道造成这种情况的原因是什么？

编辑：错误是array_key_exists AND isset 对于通过循环数组获得的密钥返回FALSE！

serialize($appliance_data)



a:7:{s:2:"94";O:8:"stdClass":3:{s:9:"operation";s:3:"514";s:5:"value";s:1:"2";s:9:"frequency";s:1:"0";}s:3:"102";O:8:"stdClass":3:{s:9:"operation";s:3:"511";s:5:"value";s:1:"4";s:9:"frequency";s:1:"1";}s:2:"90";O:8:"stdClass":3:{s:9:"operation";s:1:"0";s:5:"value";s:1:"0";s:9:"frequency";s:1:"0";}s:2:"68";O:8:"stdClass":3:{s:9:"operation";s:3:"501";s:5:"value";s:1:"3";s:9:"frequency";s:1:"2";}s:2:"66";O:8:"stdClass":3:{s:9:"operation";s:1:"0";s:5:"value";s:1:"0";s:9:"frequency";s:1:"0";}s:2:"84";O:8:"stdClass":3:{s:9:"operation";s:1:"0";s:5:"value";s:1:"0";s:9:"frequency";s:1:"0";}s:2:"98";O:8:"stdClass":3:{s:9:"operation";s:1:"0";s:5:"value";s:1:"0";s:9:"frequency";s:1:"0";}}

Answer 1

您正在使用字符串'94'而不是int 94.尝试：

print_r(array_key_exists(94, $appliance_data));

编辑：我根本无法在本地重现此内容 - 其他人可以吗？

我尝试使用以下代码复制它：

$first = new stdClass();
$first->operation = 0;
$first->value = 0;
$second = new stdClass();
$second->operation = 501;
$second->value = 4;
$third = new stdClass();
$third->operation = 0;
$third->value = 0;

$appliance_data = array(94 => $first, 102 => $second, 90 => $third);
// Same output when using these lines too:
// $appliance_data = array('94' => $first, '102' => $second, '90' => $third);
// $appliance_data = array("94" => $first, "102" => $second, "90" => $third);

print_r($appliance_data);
echo "\n\n";
foreach ($appliance_data as $adKey => $adValue) {
    print_r($adKey);
    echo "\n";
    print_r($adValue);
    print_r(array_key_exists($adKey, $appliance_data));
    echo "\n";
    print_r(isset($appliance_data[$adKey]));
    echo "\n\n";
}

得到了这个输出：

Array
(
    [94] => stdClass Object
        (
            [operation] => 0
            [value] => 0
        )

    [102] => stdClass Object
        (
            [operation] => 501
            [value] => 4
        )

    [90] => stdClass Object
        (
            [operation] => 0
            [value] => 0
        )

)


94
stdClass Object
(
    [operation] => 0
    [value] => 0
)
1
1

102
stdClass Object
(
    [operation] => 501
    [value] => 4
)
1
1

90
stdClass Object
(
    [operation] => 0
    [value] => 0
)
1
1

PHP array_key_exists错误地返回FALSE

1 个答案: