Is there a way to retreive a key from JSON string with out going in to foreach loop?
$json ="{\"error\":{\"code\":301}}";
if (empty($json)) {
die('empty string');
} else {
$obj = json_decode($json);
foreach ($obj as $key => $object) {
echo $key;
}
}
What I need is to detect where the string contains error or not, so I can create error handling.
Thanks in advance
You can use property_exists() method:
$json ="{\"error\":{\"code\":301}}";
if (empty($json)) {
die('empty string');
} else {
$obj = json_decode($json);
var_dump(property_exists($obj, 'error'));
}
Related
I have json string that I have to edit and then transform back to json. But unfortunately I can't really restore the json structure.
The structure of the original json string ($json):
"[{"Language":{"0":"EN"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}},
{"Language":{"0":"DE"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}},
{"Language":{"0":"FR"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}}]"
The structure I get after my edits ($newJson):
"{"0":{"Language":{"0":"EN"},"Text":{"0":"yyy"},"ContentType":{"0":"PlainText"}},
"1":{"Language":{"0":"DE"},"Text":{"0":"yyy"},"ContentType":{"0":"PlainText"}},
"2":{"Language":{"0":"FR"},"Text":{"0":"yyy"},"ContentType":{"0":"PlainText"}}}"
Here is what I do with my edits:
$jsonArray = object_to_array(json_decode($json));
$editedJsonArray = someLoopStuff($jsonArray);
$newJson = json_encode(array_to_object(($editedJsonArray)));
function object_to_array($obj) {
if(is_object($obj)) $obj = (array) $obj;
if(is_array($obj)) {
$new = array();
foreach($obj as $key => $val) {
$new[$key] = $this->object_to_array($val);
}
}
else $new = $obj;
return $new;
}
function array_to_object($a) {
if (is_array($a) ) {
foreach($a as $k => $v) {
$a[$k] = $this->array_to_object($v);
}
return (object) $a;
}
return $a;
}
Do you have an idea how I could get the same structure as the original json?
Use arrays instead of objects. Pass true to json_decode() as second argument and then do your stuff on arrays.
$jsonArray = json_decode($json, true);
Then just make your operation in loop on $jsonArray and simply use json_encode() without any additional work.
To achieve exactly same output as you have on input you need to cast subarrays on objects:
$jsonArray = json_decode('[{"Language":{"0":"EN"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}},{"Language":{"0":"DE"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}},{"Language":{"0":"FR"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}}]', true);
foreach ($jsonArray as &$item) {
foreach ($item as &$val) {
$val = (object) $val;
}
unset($val);
}
unset($item);
var_dump(json_encode($jsonArray));
Output:
string(226) "[{"Language":{"0":"EN"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}},{"Language":{"0":"DE"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}},{"Language":{"0":"FR"},"Text":{"0":"xxx"},"ContentType":{"0":"PlainText"}}]"
What if you would try to avoid using functions object_to_array and array_to_object. In the encoding part it is not necessary, because json_encode can handle objects or arrays. In the first part json_decode can be called with second optional parameter set to true to produce array instead of object. See PHP manual.
What I need is,
but what i got is,
How can I remove "#attributes" from the result.
The below code works for me:
// Cleans up ugly JSON data by removing #attributes tag
function cleanup_json ($ugly_json) {
if (is_object($ugly_json)) {
$nice_json = new stdClass();
foreach ($ugly_json as $attr => $value) {
if ($attr == '#attributes') {
foreach ($value as $xattr => $xvalue) {
$nice_json->$xattr = $xvalue;
}
} else {
$nice_json->$attr = cleanup_json($value);
}
}
return $nice_json;
} else if (is_array($ugly_json)) {
$nice_json = array();
foreach ($ugly_json as $n => $e) {
$nice_json[$n] = cleanup_json($e);
}
return $nice_json;
} else {
return $ugly_json;
}
}
// Convert XML to JSON
function convert_to_json ($xml_string) {
$xml = simplexml_load_string($xml_string);
$ugly_json = json_decode(json_encode($xml));
$nice_json = cleanup_json($ugly_json);
return json_encode($nice_json, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
}
Try this. It may work for you.
$xml = simplexml_load_string($string);
$json = json_encode($xml, true);
In PHP, how to get a JSON value from a variable path ?
Here is a sample json and a function with 2 params: a json variable, and path split into keys.
$myjson = json_decode('{
"myKey1": {
"myKey2": {
"myKey3": {
"myKey4": "myfinalvalue"
}
}
}
}');
function getJSONValue($myjson, $pathkey) {
// split path keys by ";"
$myjson-> ?? $pathkey ??
}
echo getJSONValue($myjson, "myKey1;myKey2;myKey3;myKey4");
// Should display "myfinalvalue"
the static equivalent would be to do:
$myjson->myKey1->myKey2->myKey3->myKey4;
I tried:
$myjson->$pathkey
but unfortunately, it doesn't work...
Actually, your question has nothing to do with JSON. This is how you can get a value from a nested object:
function getValue($obj, $path) {
foreach(explode(';', $path) as $key) {
$obj = $obj->$key;
}
return $obj;
}
As for the JSON part, your example is not a valid JSON. It should be like this:
$myjson = json_decode('{
"myKey1": {
"myKey2": {
"myKey3": {
"myKey4": "myfinalvalue"
}
}
}
}');
Also, php objects are case-sensitive, if you have myKey in the object, it should be myKey (and not mykey) in the path string.
function getJSONValue($myjson, array $pathkey) {
foreach($pathkey as $val){
$myjson = $myjson->{$val};
}
return $myjson;
}
$myjson = json_decode('{"myKey1": {"myKey2": {"myKey3": {"myKey4": "myfinalvalue"}}}}');
echo getJSONValue($myjson, ["myKey1","myKey2","myKey3","myKey4"]);
live example: http://codepad.viper-7.com/1G78Fi
Something like this:
function getJSONValue() {
$args = func_get_args();
$json = array_shift($args);
$key = array_shift($args);
$value = $json->$key;
if(is_object($value)) {
array_unshift($args, $value);
return call_user_func_array('getJSONValue', $args);
}
return $value;
}
No error checking.
Seems like you are mixing PHP and JS. check this out to see how to create a Json string, then getting an onject out of it, and accessing keys:
$myjson = json_encode(array(
'myKey1' => array(
'mykey2' => array(
'mykey3' => array(
'myKey4' => "myfinalvalue"
)
)
)
));
$obj = json_decode($string);
echo $obj->myKey1->mykey2->mykey3->myKey4
// "myfinalvalue"
or pasting the json directly:
$obj = json_decode(
'{
myKey1: {
mykey2: {
mykey3: {
myKey4: "myfinalvalue"
}
}
}
}');
echo $obj->myKey1->mykey2->mykey3->myKey4
// "myfinalvalue"
To understand it betterm, read about JSON_DECODE
[{"name":"se","value":"test1"},{"name":"model","value":"test2"},{"name":"filter_preference","value":"test3"},{"name":"seved","value":"test4"}]
I have json, and I would like to parse it, and to get for "segment" => "test1"
and so on.
i have done this
$json2= json_encode($loadFilter);
$json2 = json_decode($json2, true);
foreach ($json2->$key as $value)
{
echo $key ."=>".$value;
}
always getting Invalid argument supplied for foreach() !!!
I am doing it WP ajax callback.
Your foreach syntax is wrong to access the $key.
foreach ($json2 as $key => $value) {
echo $key ."=>".$value;
}
Edit from your comments:
You didn't give the "real" format in your question, your array is contained in 'filter_preference', so you have to iterate over $json2['filter_preference'].
foreach ($json2['filter_preference'] as $key => $value) {
echo $key ."=>".$value;
}
you need to map key value for sub array.
try this:
foreach ($json2 as $key=>$value)
{
echo $key ."=>".$value;
}
One odd suggestion here:
If you want to use array for this then you can convert object to array using following code:
function objectToArray($d) {
if (is_object($d)) {
// Gets the properties of the given object
// with get_object_vars function
$d = get_object_vars($d);
}
if (is_array($d)) {
/*
* Return array converted to object
* Using __FUNCTION__ (Magic constant)
* for recursive call
*/
return array_map(__FUNCTION__, $d);
}
else {
// Return array
return $d;
}
}
$array_new = objectToArray($json2);
http://wonderphp.wordpress.com/2014/03/20/convert-object-to-array-and-vice-versa/
I want to add comment on facebook post.. via facebook API
The function that adds the comment is
public function fill($json)
{
if(isset($json['data']))
{
$json = $json['data'];
}
foreach($json as $k => $v ) $this->{$k} = $v;
}
I am passing the data in json format as
{"data":{"id":"153870348034313_347443752010304","message":"test comment"}}
but the response is: Invalid argument supplied for foreach()
You didn't decode the JSON:
public function fill($json)
{
$json = json_decode($json);
if(isset($json->data))
{
$json = $json->data;
}
foreach($json as $k => $v ) $this->{$k} = $v;
}