I'm really not sure how to explain this. It's so simple I can't fathom why it's not working.
I have a loop. It puts a bunch of strings into an array. If I fill a single variable with any given string, it will output it perfectly.
But filling an array with the strings will make it give me the dreaded:
Array Array Array Array Array Array Array Array
Note: my strings are not all 'Array'.
The way I loop is:
while(...)
{
$arr[] = $resultFromLoop;
}
Here is my var_dump.
array(1) {
["tagName"]=>
string(5) "magic"
}
array(1) {
["tagName"]=>
string(4) "nunu"
}
array(1) {
["tagName"]=>
string(5) "books"
}
array(1) {
["tagName"]=>
string(0) ""
}
array(1) {
["tagName"]=>
string(3) "zzz"
}
array(1) {
["tagName"]=>
string(4) "grey"
}
array(1) {
["tagName"]=>
string(3) "new"
}
array(1) {
["tagName"]=>
string(6) "flight"
}
This is because you're working with array as with a string.
It puts a bunch of strings into an array.
Nope, there are no strings. I already gave you a magic var_dump($resultFromLoop) function, but you're too lazy to use it for debugging your code (because there is SO, where you can ask any question and don't bother yourself with thinking)
Related
I'm currently getting a JSON response from a company's API and converting it into a PHP array like this:
$api_url = file_get_contents('http://example.com');
$api_details = json_decode($api_url, true);
When I run var_dump on $api_details, I am getting this:
array(2) {
["metadata"]=>
array(5) {
["iserror"]=>
string(5) "false"
["responsetime"]=>
string(5) "0.00s"
["start"]=>
int(1)
["count"]=>
int(99999)
}
["results"]=>
array(3) {
["first"]=>
int(1)
["result"]=>
array(2) {
[0]=>
array(4) {
["total_visitors"]=>
string(4) "3346"
["visitors"]=>
string(4) "3249"
["rpm"]=>
string(4) "0.07"
["revenue"]=>
string(6) "0.2381"
}
[1]=>
array(4) {
["total_visitors"]=>
string(6) "861809"
["visitors"]=>
string(6) "470581"
["rpm"]=>
string(4) "0.02"
["revenue"]=>
string(7) "13.8072"
}
}
}
}
I'm trying to do 2 things and can't figure out how to do either with a multidimensional array.
I need to check to see if metadata > iserror is false. If it is not false, I want to show an error message and not continue with the script.
If it is false, then I wants to loop through the results of results > result and echo the total_visitors, visitors, etc for each of them.
I know how to echo data from array, I guess I'm just getting confused when there's multiple levels to the array.
Anyone that can point me in the right direction would be much appreciated :)
You can iterate over arrays using foreach. You can read up on it here: http://php.net/manual/en/control-structures.foreach.php
Since you're using associative arrays, your code will look something like this:
if ($arr['metadata']['iserror']) {
// Display error here
} else {
foreach($arr['results']['result'] as $result) {
echo $result['total_visitors'];
echo $result['visitors'];
}
}
You'll have to tweak the code to fit exactly what you're doing, but this should get you over the line.
Hope that helps!
I have an array name $json_output.
array(3) {
["ProductsSummary"]=>
array(2) {
["TotalPages"]=>
int(2)
["CurrentPage"]=>
int(1)
}
["Products"]=>
array(60) {
[0]=>
array(3) {
["LastShopUpdate"]=>
string(26) "/Date(1382716320000+0200)/"
["Score"]=>
float(0.2208696)
["ProductId"]=>
int(1306413101)
["ArticleNumber"]=>
}
[1]=>
array(3) {
["LastShopUpdate"]=>
string(26) "/Date(1382716320000+0200)/"
["Score"]=>
float(0.2208696)
["ProductId"]=>
int(1306413101)
["ArticleNumber"]=>
}
And so on. I need to unset ProductId and LastShopUpdate from each one.
What i tried:
<?php
foreach($json_output["Products"] as $bla)
unset($bla['ArticleNumber'], $bla['LastShopUpdate']);
?>
But it is not working. How could I do this?
When looping over an array using foreach, a copy is usually made. Changing something in the copy of course has no effect on the original. Try this:
foreach($json_output["Products"] as & $bla)
unset($bla['ArticleNumber'], $bla['LastShopUpdate']);
The & causes $bla to be a reference instead of a copy. Therefore it should resolve your problem.
I am trying to create a JSON representation of data stored in mySQL.
I am trying to document a RESTful API.
I am using PHP's json_encode() function.
I have a table that contains data such as
1) name
2) parent
3) data_type (object/array/string/number to match JSON data types)
4) value
I am trying to create a generalized function that will allow me to build these JSON strings by simply adding data to the mySQL database.
I am having problems with working with both objects and arrays though.
For instance the JSON should be:
{
"sessionToken":"","roleName":""
,"data":[
{
"methodTypes":[""] , "objects":[""]
}
]
}
however it is coming out as:
{
"sessionToken":"","roleName":""
,"data":[
{
"methodTypes":[""]
}
,{
"objects":[""]
}
]
}
this is indicating to me for some reason my code is adding an object for both methodType and objects, where as it should just be within the single object.
I am trying to first create an array containing methodTypes and objects.
Then I create an object in the format of $objects->$A, and I make this equal the array created in the first step.
Then I add in to the primary data array for the JSON generation.
I have been searching for examples that show usage examples of JSON when both arrays and objects are required in the same JSON without success.
Any pointers in the correct direction would be greatly appreciated.
UPDATE #1:
var_dump of the array that is being fed to json_encode() is:
array(3) { ["sessionToken"]=> string(0) "" ["roleName"]=> string(0) "" ["data"]=> array(2) { [0]=> array(1) { ["methodTypes"]=> array(1) { [0]=> string(0) "" } } [1]=> array(1) { ["objects"]=> array(1) { [0]=> string(0) "" } } } }
where as if I take a known good JSON and do a json_decode() then the var_dump looks like:
object(stdClass)#3 (3) { ["sessionToken"]=> string(0) "" ["roleName"]=> string(0) "" ["data"]=> array(1) { [0]=> object(stdClass)#4 (2) { ["methodTypes"]=> array(1) { [0]=> string(0) "" } ["objects"]=> array(1) { [0]=> string(0) "" } } } }
or
array(3) { ["sessionToken"]=> string(0) "" ["roleName"]=> string(0) "" ["data"]=> array(1) { [0]=> array(2) { ["methodTypes"]=> array(1) { [0]=> string(0) "" } ["objects"]=> array(1) { [0]=> string(0) "" } } } }
if I set it to TRUE to return array instead of object.
Edited to give the desired output
$data = ['sessionToken' => '',
'roleName' => '',
'data' => [['methodTypes' => [''], 'objects' => ['']]]
];
And it yields. This works because I wrapped the associative array in a non-associative one
{"sessionToken":"","roleName":"","data":[{"methodTypes":[""],"objects":[""]}]}
EDIT
Some more info on json_encode
Javascript arrays contain only numeric keys. Period. If you have what looks like an associative array, it's really a JS object (which can be referenced using brackets, i.e. var['name'] and var.name are equivalent).
Since json_encode can't create an associative array in JSON, it converts associative PHP arrays into objects instead. So you can see in my example above, I got an object back instead of an array, except where I has not specified keys.
echo json_encode(['name' => 'value']);
Yields
{"name":"value"}
While
echo json_encode(['value']);
Yields
["value"]
My question: How can I break up and iterate through the JSON array pictured below?
I am making an AJAX web app and I need to serialize an array of objects in Javascript and put them in a url to pass to a php script. This is all going fine and the php script recieves the JSON like so..
$passed = $_GET['result'];
if(isset($passed)){
$passed = str_replace("undefined" , " " , $passed); /*had to add this to remove the undefined value*/
$json = json_decode(stripslashes($passed));
echo"<br/>";
var_dump($json ); //this is working and dumps an array
}
When I call var_dump on the decoded JSON I echo an output like so...
array(1) { [0]=> object(stdClass)#70 (2) { ["itemCount"]=> int(0) ["ItemArray"]=> array(2) { [0]=> object(stdClass)#86 (6) { ["itemPosition"]=> int(0) ["planPosition"]=> int(0) ["Name"]=> string(5) "dsfsd" ["Description"]=> string(3) "sdf" ["Price"]=> string(0) "" ["Unit"]=> string(0) "" } [1]=> object(stdClass)#85 (6) { ["itemPosition"]=> int(1) ["planPosition"]=> int(0) ["Name"]=> string(4) "fdad" ["Description"]=> string(3) "sdf" ["Price"]=> string(0) "" ["Unit"]=> string(0) "" } } } }
The JSON
This is the JSON I am receiving. It seems like some of the pairs don't have names? How can I access elements in this Array?
Thanks alot guys
Some of these elements are coming back as stdClass objects as you can see in the var_dump output. You can get at the attributes with the standard object notation, for example, with your $json variable:
echo $json[0]->itemCount; // 0
echo $json[0]->itemArray[0]->itemPostion; // 0
You can also iterate over stdClass instances just like any PHP object, you'll be looping through the public data members, so again with your $json:
foreach(echo $json[0]->itemArray[0] as $key => $value)
echo 'key: ' . $key . ', value: ' . $value . PHP_EOL;
will loop through that first object, echoing out the member names and values of the object.
You just access them by index:
data[0] // first data item
Note that that's how you would "normally" access an array in the usual sense, so I might be missing something about your question here...
I am still very new to PHP and from all the examples that are around they all seem to use foreach statements.
e.g.
foreach ($variable as $row)
However I don't think I should be using this all the time, for example variables or objects I have an which only has one row or instance in an array.
I know its advantageous to use them for multiple rows which could be missed if you used a for loop.
But do I really need to use it just to echo one variable thats in an array?
e.g. for example this variable $stats
array(3) { ["user_interventions"]=> int(4) ["fastest_intervention"]=> array(1) { [0]=> object(stdClass)#22 (1) { ["duration"]=> string(8) "02:10:00" } } ["slowest_intervention"]=> array(1) { [0]=> object(stdClass)#23 (1) { ["duration"]=> string(8) "02:26:00" } } }
Thanks
if you know the 'address' of the value in your array, then there's no need for a loop:
echo $arr['user_interventions'][0]['duration']; // 02:10:00
More details here.
No, you do not need to use a foreach loop every time you need to access an array value. Your example could be used in the following manner...
echo $stats['fastest_intervention']['0']->duration; // Outputs: 02:10:00
Here's your variable dump with indentation (makes it easier to read).
array(3) {
["user_interventions"]=> int(4)
["fastest_intervention"]=> array(1) {
[0]=> object(stdClass)#22 (1) {
["duration"]=> string(8) "02:10:00"
}
}
["slowest_intervention"]=> array(1) {
[0]=> object(stdClass)#23 (1) {
["duration"]=> string(8) "02:26:00"
}
}
}
You need not to use foreach here but you can't just print $array
if you indexes of array you may print something like:
print 'Key is '.$array['key'].' but index is only'.$array['index'];
You just access the variables using []. print $array['key']