转换JSON字符串数组但不json_de code [英] Convert JSON string to array WITHOUT json_decode
问题描述
我使用的共享服务器上通过PHP是返回一个包含2级数据的JSON API来访问外部站点（1级：表演和放大器; 2级：里面表演类数组）。我想将其转换为多维关联数组，而无需使用json_de code函数（它使用了太多的内存为这种用法！）
JSON数据示例：
[
{
performerId：99999，
名：任何表演者的名字，
类别：{
的categoryId：99，
名：有些类别名称，
EVENTTYPE：事件类
}，
EVENTTYPE：演员事件，
URL：http://www.novalidsite.com/something/performerspage.html
优先级：0
}，
{
performerId：88888，
名：第二次表演的名字
类别：{
的categoryId：88，
名：第二类名，
EVENTTYPE：类别事件2
}，
EVENTTYPE：演员事件2
URL：http://www.novalidsite.com/somethingelse/performerspage2.html
优先级：7
}
]
我曾尝试使用SUBSTR和剥离[和]。
然后进行呼叫：
preg_match_all（'/ \\ {（[^}] +）\\} /'，$投入，$匹配）;
这让我对每一行的字符串，但尾随后截断}一类的数据。
我怎样才能返回数据的全行作为使用像preg_split，preg_match_all等，而不是重手呼叫像整体JSON字符串json_de code数组？
一旦我有正确识别每一行的数组，然后我就可以执行该字符串json_de code，而不共享服务器上暴敛内存。
对于那些想要更详细了解json_de code的使用导致错误：
$ aryPerformersfile [] =的file_get_contents（'https://subdomain.domain.com/dir/getresults?id=1234'）;
$ aryPerformers = $ aryPerformersfile [0];
未设置（$ aryPerformersfile）;
$ mytmpvar = json_de code（$ aryPerformers）;
的print_r（$ mytmpvar）;
出口;
如果你的内存是有限的，你可以读取数据流，并解析JSON一块的时间，而不是在一次解析一切
getresults.json：
[
{
performerId：99999，
名：任何表演者的名字，
类别：{
的categoryId：99，
名：有些类别名称，
EVENTTYPE：事件类
}，
EVENTTYPE：演员事件，
URL：http://www.novalidsite.com/something/performerspage.html
优先级：0
}，
{
performerId：88888，
名：第二次表演的名字
类别：{
的categoryId：88，
名：第二类名，
EVENTTYPE：类别事件2
}，
EVENTTYPE：演员事件2
URL：http://www.novalidsite.com/somethingelse/performerspage2.html
优先级：7
}
]
PHP：
$ =流的fopen（'getresults.json'，'RB'）;//从$流，直到一次读一个字符
// $的字符的字符$计数读
功能readUpTo（$流，$字符，$计数）
{
$海峡='';
$ foundCount = 0;
而（！的feof（$流））{
$ readChar = stream_get_contents（$流，1）; $海峡= $ readChar。
如果（$ readChar == $字符和放大器;＆安培; ++ $ foundCount == $计数）
返回$海峡;
}
返回false;
}//读取一个JSON对象演员
功能readOneJsonPerformer（$流）
{
如果（$ JSON = readUpTo（$流，{，1））
返回{。 readUpTo（$流，}，2）;
返回false;
}而（$ JSON = readOneJsonPerformer（$流））{
$表演= json_de code（$ JSON）; 回声的表演者ID。 $ performer-＆GT; performerId
。 有类别。 $ performer-＆GT;＆类别 - GT;名，PHP_EOL;
}
FCLOSE（$流）;
输出：
演员ID为99999有一些类别类别名称
表演者ID 88888有类别二类别名称
这code当然可以通过使用缓冲区更快的读取速度，考虑到字符串值本身可能包括提高 {和} 字符等。
I am using PHP on shared server to access external site via API that is returning JSON containing 2 levels of data (Level 1: Performer & Level 2: Category array inside performer). I want to convert this to multidimensional associative array WITHOUT USING json_decode function (it uses too much memory for this usage!!!)
Example of JSON data:
[
{
"performerId": 99999,
"name": " Any performer name",
"category": {
"categoryId": 99,
"name": "Some category name",
"eventType": "Category Event"
},
"eventType": "Performer Event",
"url": "http://www.novalidsite.com/something/performerspage.html",
"priority": 0
},
{
"performerId": 88888,
"name": " Second performer name",
"category": {
"categoryId": 88,
"name": "Second Category name",
"eventType": "Category Event 2"
},
"eventType": "Performer Event 2",
"url": "http://www.novalidsite.com/somethingelse/performerspage2.html",
"priority": 7
}
]
I have tried to use substr and strip the "[" and "]".
Then performed the call:
preg_match_all('/\{([^}]+)\}/', $input, $matches);
This gives me the string for each row BUT truncates after the trailing "}" of the category data.
How can I return the FULL ROW of data AS AN ARRAY using something like preg_split, preg_match_all, etc. INSTEAD of the heavy handed calls like json_decode on the overall JSON string?
Once I have the array with each row identified correctly, I CAN THEN perform json_decode on that string without overtaxing the memory on the shared server.
For those wanting more detail about json_decode usage causing error:
$aryPerformersfile[ ] = file_get_contents('https://subdomain.domain.com/dir/getresults?id=1234');
$aryPerformers = $aryPerformersfile[0];
unset($aryPerformersfile);
$mytmpvar = json_decode($aryPerformers);
print_r($mytmpvar);
exit;
If you have a limited amount of memory, you could read the data as a stream and parse the JSON one piece at a time, instead of parsing everything at once.
getresults.json:
[
{
"performerId": 99999,
"name": " Any performer name",
"category": {
"categoryId": 99,
"name": "Some category name",
"eventType": "Category Event"
},
"eventType": "Performer Event",
"url": "http://www.novalidsite.com/something/performerspage.html",
"priority": 0
},
{
"performerId": 88888,
"name": " Second performer name",
"category": {
"categoryId": 88,
"name": "Second Category name",
"eventType": "Category Event 2"
},
"eventType": "Performer Event 2",
"url": "http://www.novalidsite.com/somethingelse/performerspage2.html",
"priority": 7
}
]
PHP:
$stream = fopen('getresults.json', 'rb');
// Read one character at a time from $stream until
// $count number of $char characters is read
function readUpTo($stream, $char, $count)
{
$str = '';
$foundCount = 0;
while (!feof($stream)) {
$readChar = stream_get_contents($stream, 1);
$str .= $readChar;
if ($readChar == $char && ++$foundCount == $count)
return $str;
}
return false;
}
// Read one JSON performer object
function readOneJsonPerformer($stream)
{
if ($json = readUpTo($stream, '{', 1))
return '{' . readUpTo($stream, '}', 2);
return false;
}
while ($json = readOneJsonPerformer($stream)) {
$performer = json_decode($json);
echo 'Performer with ID ' . $performer->performerId
. ' has category ' . $performer->category->name, PHP_EOL;
}
fclose($stream);
Output:
Performer with ID 99999 has category Some category name
Performer with ID 88888 has category Second Category name
This code could of course be improved by using a buffer for faster reads, take into account that string values may themselves include { and } chars etc.
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