在php麻烦中解析json文件

Question

我有这个数据 cennik.json 文件：

{
    "waluta": "PLN",
    "vat": 1.23,
    "00101": {
        "cena": 340,
        "powiazanyZ": "00139"
    },
    "00102": {
        "cena": 325.33,
        "powiazanyZ": "00140"
    },
    "00103": {
        "cena": 306.67,
        "powiazanyZ": "00141"
    },
    "00104": {
        "cena": 289.33,
        "powiazanyZ": "00142"
    },
    "00105": {
        "cena": 276,
        "powiazanyZ": "00143"
    },
    "00106": {
        "cena": 258.67,
        "powiazanyZ": "00144"
    },
    "00107": {
        "cena": 240,
        "powiazanyZ": "00145"
    },
    "00108": {
        "cena": 222.67,
        "powiazanyZ": "00146"
    },
    "00109": {
        "cena": 205.33,
        "powiazanyZ": "00147"
    },
    "00110": {
        "cena": 189.33,
        "powiazanyZ": "00148"
    },
    "00120": {
        "cena": 413.33,
        "powiazanyZ": "00150"
    },
    "00121": {
        "cena": 73.33,
        "powiazanyZ": "00000"
    },
    "00122": {
        "cena": 153.33,
        "powiazanyZ": "00000"
    },
    "00123": {
        "cena": 153.33,
        "powiazanyZ": "00000"
    },
    "00138": {
        "cena": 1937,
        "powiazanyZ": "00152"
    },
    "00139": {
        "cena": 366.82,
        "powiazanyZ": "00101"
    },
    "00140": {
        "cena": 325.33,
        "powiazanyZ": "00102"
    },
    "00141": {
        "cena": 306.67,
        "powiazanyZ": "00103"
    },
    "00142": {
        "cena": 289.33,
        "powiazanyZ": "001041"
    },
    "00143": {
        "cena": 276,
        "powiazanyZ": "00105"
    },
    "00144": {
        "cena": 258.67,
        "powiazanyZ": "00106"
    },
    "00145": {
        "cena": 240,
        "powiazanyZ": "00107"
    },
    "00146": {
        "cena": 222.67,
        "powiazanyZ": "00108"
    },
    "00147": {
        "cena": 205.33,
        "powiazanyZ": "00109"
    },
    "00148": {
        "cena": 189.33,
        "powiazanyZ": "00110"
    },
    "00150": {
        "cena": 413.33,
        "powiazanyZ": "00120"
    },
    "00152": {
        "cena": 1997.33,
        "powiazanyZ": "00138"
    }
}

这来自我的 php 文件：

$vat = 0.00;
$waluta = '';
$kod00101 = 0.00;
$kod00102 = 0.00;
...
$kod00152 = 0.00;

$cennik_plik = file_get_contents("cennik.json");
$jsonIterator = new RecursiveIteratorIterator(
    new RecursiveArrayIterator(json_decode($cennik_plik, TRUE)),
    RecursiveIteratorIterator::SELF_FIRST);

foreach ($jsonIterator as $key => $val) {
    if(is_array($val)) {
        $v = ${'kod'.$key};
        if('$key' == $v){
            $v = number_format((float)$val[cena],2,'.','');
        }
    } else {
        if('$key' == 'waluta') {$waluta = $val;};
        if('$key' == 'vat') {$vat = number_format((float)$val,2,'.','');};
    }
}

我正在尝试这个，我得到以下错误：

致命错误：在 C:\Documents and Settings\user\Desktop\Lighty2Go\HTDOCS\ogr\index.php 中带有消息“传递的变量不是数组或对象，而是使用空数组”的未捕获异常“InvalidArgumentException”： 50
堆栈跟踪：
 #0 C:\Documents and Settings\user\Desktop\Lighty2Go\HTDOCS\ogr\index.php(50): ArrayIterator->__construct('???{?? "walu...')
 #1 {main} 在第 50 行的 C:\Documents and Settings\user\Desktop\Lighty2Go\HTDOCS\ogr\index.php 中抛出

有什么建议吗？

我尝试使用这些资源自己解决它，但没有：

• Parsing JSON file with PHP
• Parsing this JSON file structure

Answer 1

我不太确定您正在尝试使用该数据做什么。但你当然不需要那个RecursiveArrayIterator。一个无聊的foreach 就足以遍历那个数组了：

$json = file_get_contents("cennik.json");
# the culprit was the UTF-8 BOM, which OPs specific verison of json_decode tripped over (newer versions would return NULL)
$json = preg_replace('/^\xEF\xBB\xBF/', '', $json);
$array = json_decode($json, TRUE);

var_dump($array);    # <-- WHAT DOES THAT OUTPUT ??


foreach ($array as $key => $value) {

    if ($key == "waluta") {
        $waluta = $value;
    }
    elseif ($key == "vat") {
        $vat = $value;
    }

    // all the data entries
    elseif (is_numeric($key)) {
        $kod[$key] = $value["cena"];
        // ${"kod$key"} = ...;
    }
}

请注意，您可以使用可变变量。但是这个例子尖叫array。我什至不确定为什么要使用单独的变量列表。源数组应该足够好使用。