Solution to Json_decode garbled and null

The students who write the interface should often encounter the conversion of the data format, when the essential two functions are Json_encode () and Json_decode ().

These two functions are used when there are a lot of main things, here I say Json_decode ().

Json_decode (): decodes a JSON-formatted string, accepts a JSON-formatted string, and converts it to a PHP variable.

(1) After converting data to an array, printing will display null:

One reason Json_decode only supports utf-8.

Iconv (' GBK ', ' utf-8 ', $result _string); Use the Iconv function to convert the GBK encoding format of the write data to the Utf-8 encoding format to be output, if the original data is in UTF-8 format, this step is not necessary, otherwise garbled

Note: Using the Iconv function is not PHP's own, you need to be able to modify the php.ini file, will be extension=php_iconv.dll before the ";" Remove and copy the Iconv.dll under your original PHP installation file to your Winnt/system32 (if your DLL is pointing to this directory). (It's possible that the PHP installation file??? ）

Reason two:the JSON string must be enclosed in double quotation marks

Str_replace ("'", ' "', $result _string);//Replace single-lead in JSON data with double-lead

Reason three: cannot have extra comma such as: [1, 2,]

Replace with regular, Preg_replace ('/,\s* ([\]}])/M ', ' $ ', $result _string);

(2) after converting data into an array or after converting to JSON format data, garbled characters are displayed:

UrlEncode () and UrlDecode () are used at this time

Here is my code, tested and effective

if (file_exists ($result [' Save_path '])) {

$contents =file_get_contents ($result [' Save_path ']);//writes the contents of a file to the Utf-8 format, which is a JSON-formatted data

$getcontent = Iconv ("GBK", "Utf-8//ignore", $contents);//If the file is originally Utf-8 format, no conversion required

$getcontent =str_replace ("'", ' "', $contents);//Replace single-lead with double-lead

Preg_replace ('/,\s* ([\]}])/M ', ' $ ', $getcontent);//Remove the extra comma

$new _array=array ();

$new _array=json_decode ($getcontent, true);

$res =array ();

foreach ($new _array as $key = + $val) {

foreach ($new _array[$key [' Items '] as $k = = $v) {

if ($k < $row) {

$res [$k] [' Position ']= $v [' position '];

$res [$k] [' Distance ']= $v [' distance '];

$res [$k] [' title ']=urlencode ($v [' title ']);

$res [$k [' vicinity ']=urlencode ($v [' vicinity ']);

}

}

}

if ($res) {

$new _res[' items ']= $res;

}else{

$new _res[' items ']= "";

}

Echo UrlDecode (Json_encode ($new _res));

}

Solution to Json_decode garbled and null