使用 PHP 将数据附加到 .JSON 文件
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Append data to a .JSON file with PHP
提问by benhowdle89
I have this .json file:
我有这个 .json 文件：
[
{
"id": 1,
"title": "Ben\'s First Blog Post",
"content": "This is the content"
},
{
"id": 2,
"title": "Ben\'s Second Blog Post",
"content": "This is the content"
}
]
This is my PHP code:
这是我的 PHP 代码：
<?php
$data[] = $_POST['data'];
$fp = fopen('results.json', 'a');
fwrite($fp, json_encode($data));
fclose($fp);
The thing is, I'm not exactly sure how to achieve it. I'm going to call this code above every time a form is submitted, so I need the ID to increment and to also keep the valid JSON structure with [and {, is this possible?
问题是，我不确定如何实现它。我要呼吁每一个表单提交的时候上面这段代码，所以我需要的ID，以增量，也保持有效的JSON结构[和{，这可能吗？
回答by Tim
$data[] = $_POST['data'];
$inp = file_get_contents('results.json');
$tempArray = json_decode($inp);
array_push($tempArray, $data);
$jsonData = json_encode($tempArray);
file_put_contents('results.json', $jsonData);
回答by Tom Martin
This has taken the above c example and moved it over to php. This will jump to the end of the file and add the new data in without reading all the file into memory.
这已经采用了上面的 c 示例并将其移至 php。这将跳转到文件的末尾并添加新数据，而无需将所有文件读入内存。
// read the file if present
$handle = @fopen($filename, 'r+');
// create the file if needed
if ($handle === null)
{
$handle = fopen($filename, 'w+');
}
if ($handle)
{
// seek to the end
fseek($handle, 0, SEEK_END);
// are we at the end of is the file empty
if (ftell($handle) > 0)
{
// move back a byte
fseek($handle, -1, SEEK_END);
// add the trailing comma
fwrite($handle, ',', 1);
// add the new json string
fwrite($handle, json_encode($event) . ']');
}
else
{
// write the first event inside an array
fwrite($handle, json_encode(array($event)));
}
// close the handle on the file
fclose($handle);
}
回答by Marc B
You're ruining your json data by blindly appending text to it. JSON is not a format that can be manipulated like this.
您通过盲目地向其附加文本来破坏您的 json 数据。JSON 不是可以像这样操作的格式。
You'll have to load your json text, decode it, manipulate the resulting data structure, then re-encode/save it.
您必须加载 json 文本，对其进行解码，操作生成的数据结构，然后重新编码/保存它。
<?php
$json = file_get_contents('results.json');
$data = json_decode($json);
$data[] = $_POST['data'];
file_put_contents('results.json', json_encode($data));
Let's say you've got [1,2,3]stored in your file. Your code could turn that into [1,2,3]4, which is syntactically wrong.
假设您已[1,2,3]存储在文件中。您的代码可能会将其转换为[1,2,3]4，这在语法上是错误的。
回答by spstanley
If you want to add another array element to a JSON file as your example shows, open the file and seek to the end. If the file already has data, seek backwards one byte to overwrite the ]following the last entry, then write ,plus the new data minus the initial [of the new data. Otherwise, it's your first array element, so just write your array normally.
如果您想向 JSON 文件添加另一个数组元素，如示例所示，请打开该文件并查找到最后。如果文件已有数据，则向后查找一个字节以覆盖]后面的最后一个条目，然后写入,加上新数据减去新数据的首字母[。否则，它是您的第一个数组元素，因此只需正常编写您的数组即可。
Sorry I don't know enough about PHP to post actual code, but I've done this in Obj-C and it's allowed me to avoid reading the whole file in first just to add onto the end:
抱歉，我对 PHP 的了解不够，无法发布实际代码，但我已经在 Obj-C 中完成了此操作，它允许我避免首先读取整个文件，只是为了添加到最后：
NSArray *array = @[myDictionary];
NSData *data = [NSJSONSerialization dataWithJSONObject:array options:0 error:nil];
FILE *fp = fopen(fname, "r+");
if (NULL == fp)
fp = fopen(fname, "w+");
if (fp) {
fseek(fp, 0L, SEEK_END);
if (ftell(fp) > 0) {
fseek(fp, -1L, SEEK_END);
fwrite(",", 1, 1, fp);
fwrite([data bytes] + 1, [data length] - 1, 1, fp);
}
else
fwrite([data bytes], [data length], 1, fp);
fclose(fp);
}
回答by Cristiana Chavez
Sample code I used to append additional JSON array to JSON file.
我用来将额外的 JSON 数组附加到 JSON 文件的示例代码。
$additionalArray = array(
'id' => $id,
'title' => $title,
'content' => $content
);
//open or read json data
$data_results = file_get_contents('results.json');
$tempArray = json_decode($data_results);
//append additional json to json file
$tempArray[] = $additionalArray ;
$jsonData = json_encode($tempArray);
file_put_contents('results.json', $jsonData);
回答by Ramesh KC
/*
* @var temp
* Stores the value of info.json file
*/
$temp=file_get_contents('info.json');
/*
* @var temp
* Stores the decodeed value of json as an array
*/
$temp= json_decode($temp,TRUE);
//Push the information in temp array
$temp[]=$information;
// Show what new data going to be written
echo '<pre>';
print_r($temp);
//Write the content in info.json file
file_put_contents('info.json', json_encode($temp));
}
回答by Martin Mbae
I wrote this PHP code to add json to a json file. The code will enclose the entire file in square brackets and separate the code with commas.
我写了这段 PHP 代码来将 json 添加到 json 文件中。代码会将整个文件括在方括号中，并用逗号分隔代码。
<?php
//This is the data you want to add
//I am getting it from another file
$callbackResponse = file_get_contents('datasource.json');
//File to save or append the response to
$logFile = "results44.json";
//If the above file does not exist, add a '[' then
//paste the json response then close with a ']'
if (!file_exists($logFile)) {
$log = fopen($logFile, "a");
fwrite($log, '['.$callbackResponse.']');
fclose($log);
}
//If the above file exists but is empty, add a '[' then
//paste the json response then close with a ']'
else if ( filesize( $logFile) == 0 )
{
$log = fopen($logFile, "a");
fwrite($log, '['.$callbackResponse.']');
fclose($log);
}
//If the above file exists and contains some json contents, remove the last ']' and
//replace it with a ',' then paste the json response then close with a ']'
else {
$fh = fopen($logFile, 'r+') or die("can't open file");
$stat = fstat($fh);
ftruncate($fh, $stat['size']-1);
fclose($fh);
$log = fopen($logFile, "a");
fwrite($log, ','.$callbackResponse. ']');
fclose($log);
}
?>
GoodLuck
祝你好运
