PHP Issue accessing array of objects by index - not working but seems like it should-CodePudding

Hopefully I don't end up with down votes, but I've searched ad nauseum and I'm striking out. The short version is that I have an array of objects which was decoded from a JSON response from a web service and despite my best efforts, I can't access the objects in that array by index.

I'm specifically decoding the response as so:

$ResponseInfo = json_decode($ResponseBody, false);  //give to me as an object

I'm having no problems accessing the properties of the resulting object until I get to a property that is an array of objects. For context, it's property information that includes details on one or more buildings.

I expected to be able to access details on the buildings by index such as:

$ac = $ResponseInfo->building[0]->airConditioning;

This does not work. I get an index 0 undefined. Oddly, array_keys gives me:

Array ( [0] => 0 )

So it seems like the index method should work, and it isn't some strange key, but alas it doesn't.

A print_r gives me this:

Array ( [0] => stdClass Object ( [airConditioning] => Central [foundation] => [architecturalStyle] => Ranch/Rambler [yearBuilt] => 1965 [fireplace] => [noOfUnits] => 1 [effectiveYearBuilt] => [sewer] => Municipal/Public [heating] => Central [class] => [comments] => [quarterBaths] => [totalStories] => 1 [kitchens] => 2 [water] => Municipal/Public [classDescription] => [quality] => C- [totalRooms] => 5 [bedrooms] => 3 [condition] => Average [baths] => [threeQuarterBaths] => [halfBaths] => [occupancyStatus] => [fullBaths] => 1 ) ) Array ( [0] => BuildingInformationObject Object ( [airConditioning] => Central [foundation] => [architecturalStyle] => Ranch/Rambler [yearBuilt] => 1965 [fireplace] => [noOfUnits] => 1 [sewer] => Municipal/Public [heating] => Central [totalStories] => 1 [kitchens] => 2 [water] => Municipal/Public [totalRooms] => 5 [bedrooms] => 3 [condition] => Average [halfBaths] => [occupancyStatus] => [fullBaths] => 1 ) )

I also tried assigning the array to a new variable, but I still get the index 0 undefined.

$BuildingInfo  = $ResponseInfo->building;

Oddly, what does work is:

foreach ($BuildingInfo as $ThisBuilding) {

In that fashion $ThisBuilding-airconditioning (or whatever property) works fine. So I even tried creating a brand new array and manually assigning the individual properties, as so:

$Buildings = array();
$i = 0;

foreach ($BuildingInfo as $ThisBuilding)
{
    $Buildings[$i] = new BuildingInformationObject();
    //$Buildings[$i] = $ThisBuilding;     //just assigning variable didn't work, so copied properties manually
    
    $Buildings[$i]->airConditioning    = $ThisBuilding->airConditioning;   
    $Buildings[$i]->foundation         = $ThisBuilding->foundation;        
    $Buildings[$i]->architecturalStyle = $ThisBuilding->architecturalStyle;

etc..

After ALL that, attempting $Buildings[0]->airConditioning still gives me the dreaded index 0 undefined, even on the new array.

I even tried something in the form of

echo $data->{'0'}->UserName;

Such as:

$BuildingInfo->{'0'}->airConditioning;

That I found here on SO. This method was apparently valid with old versions of PHP, but it's not working now.

What in the world am I missing here? Thanks for any help.

Steve

Edit: I realize I could possibly change the json_decode to simply return an array and then deal with it as a multidimensional array, but I'm trying to avoid rewriting a bunch of code. I'm dealing ultimately with hundreds of object properties in the JSON response and the only ones I'm having issue with are the properties that are arrays of objects.

Edit 2: I'm loath to add this because of it's size, but in response to a comment, here's the JSON that I'm dealing with. I didn't want to try to cut it down for fear of inadvertantly deleting whatever is causing my problem. If there's a better way to share a bulk of unmolested JSON, please let me know.

Edit 3: in response to a comment that the building array isn't in the JSON, I cut and pasted the below JSON from this site into https://jsonformatter.org/json-parser and looked at the JSON in tree view. The building array I need to access by index is in fact in this JSON.

{"success":true,"status":200,"bundle":[{"landUseDescription":"Single Family Residential","zoningDescription":null,"year":2016,"marketLandValue":26930,"numberOfBuildings":1,"lotSizeIrregular":"85 X 138","county":"Butler County","pools":[],"censusTract":"390170118002005","areas":[{"areaSquareFeet":1492,"type":"Living Building Area"},{"areaSquareFeet":1144,"type":"Base Building Area"},{"areaSquareFeet":1140,"type":"Adjusted Building Area"},{"areaSquareFeet":1492,"type":"Zillow Calculated Finished Area"},{"areaSquareFeet":348,"type":"Addition Area"}],"building":[{"airConditioning":"Central","foundation":null,"architecturalStyle":"Ranch/Rambler","yearBuilt":1965,"fireplace":null,"noOfUnits":1,"effectiveYearBuilt":null,"sewer":"Municipal/Public","heating":"Central","class":null,"comments":null,"quarterBaths":null,"totalStories":1,"kitchens":2,"water":"Municipal/Public","classDescription":null,"quality":"C-","totalRooms":5,"bedrooms":3,"condition":"Average","baths":null,"threeQuarterBaths":null,"halfBaths":null,"occupancyStatus":null,"fullBaths":1}],"lotSizeFrontage":null,"parcelID":"112166032","marketValueYear":2014,"lotTopography":"Rocky","ownerName":["ROBERT D SUTTON"],"taxYear":2016,"marketTotalValue":89400,"taxID":"458467","taxExemption":null,"legal":{"phase":null,"tract":null,"city":null,"municipality":null,"section":null,"lot":null,"otherLot":null,"unit":null,"lotDescription":"1141 ENT","district":null,"block":null,"subdivisionName":null,"township":null},"id":"112166032-2016","state":"OH","lotSizeDepth":null,"apn":"R8000-017.000-071","marketImprovementValue":62470,"totalValue":31290,"address":{"zip":"45067","city":"Trenton","zip4":"1117","streetPre":null,"house":"431","unitType":null,"unit":null,"street":"Kenwood","houseExt":null,"streetSuffix":"Ln","state":"OH","streetPost":null,"full":" 431 Kenwood Ln Trenton OH 45067"},"landUseCode":"RR101","landUseGeneral":"RR","coordinates":[-84.465074,39.489885],"zpid":"33237764","fips":"39017","landValue":9430,"zoningCode":null,"lotSizeAcres":0.27,"garages":[],"improvementValue":21860,"taxAmount":1701.78,"lotSizeSquareFeet":11761.2,"url":"api.bridgedataoutput.com/api/v2/pub/assessments/112166032-2016"},{"landUseDescription":"Single Family Residential","zoningDescription":null,"year":2008,"marketLandValue":29380,"numberOfBuildings":1,"lotSizeIrregular":"85 X 138","county":"Butler County","pools":[],"censusTract":"390170118002005","areas":[{"areaSquareFeet":1492,"type":"Living Building Area"},{"areaSquareFeet":1144,"type":"Base Building Area"},{"areaSquareFeet":1140,"type":"Adjusted Building Area"},{"areaSquareFeet":1492,"type":"Zillow Calculated Finished Area"},{"areaSquareFeet":348,"type":"Addition Area"}],"building":[{"airConditioning":"Central","foundation":null,"architecturalStyle":"Ranch/Rambler","yearBuilt":1965,"fireplace":null,"noOfUnits":1,"effectiveYearBuilt":null,"sewer":"Municipal/Public","heating":"Central","class":null,"comments":null,"quarterBaths":null,"totalStories":1,"kitchens":2,"water":"Municipal/Public","classDescription":null,"quality":"C-","totalRooms":5,"bedrooms":3,"condition":"Average","baths":null,"threeQuarterBaths":null,"halfBaths":null,"occupancyStatus":null,"fullBaths":1}],"lotSizeFrontage":null,"parcelID":"112166032","marketValueYear":2008,"lotTopography":"Rocky","ownerName":["ROBERT D SUTTON"],"taxYear":2008,"marketTotalValue":112120,"taxID":"320818","taxExemption":null,"legal":{"phase":null,"tract":null,"city":null,"municipality":null,"section":null,"lot":null,"otherLot":null,"unit":null,"lotDescription":"1141 ENT","district":null,"block":null,"subdivisionName":null,"township":null},"id":"112166032-2008","state":"OH","lotSizeDepth":null,"apn":"R8000-017.000-071","marketImprovementValue":82740,"totalValue":39242,"address":{"zip":"45067","city":"Trenton","zip4":"1117","streetPre":null,"house":"431","unitType":null,"unit":null,"street":"Kenwood","houseExt":null,"streetSuffix":"Ln","state":"OH","streetPost":null,"full":" 431 Kenwood Ln Trenton OH 45067"},"landUseCode":"RR101","landUseGeneral":"RR","coordinates":[-84.465074,39.489885],"zpid":"33237764","fips":"39017","landValue":10283,"zoningCode":null,"lotSizeAcres":0.27,"garages":[],"improvementValue":28959,"taxAmount":1143.66,"lotSizeSquareFeet":11761.2,"url":"api.bridgedataoutput.com/api/v2/pub/assessments/112166032-2008"},{"landUseDescription":"Single Family Residential","zoningDescription":null,"year":2005,"marketLandValue":24950,"numberOfBuildings":1,"lotSizeIrregular":"85 X 138","county":"Butler County","pools":[],"censusTract":"390170118002005","areas":[{"areaSquareFeet":1492,"type":"Living Building Area"},{"areaSquareFeet":1144,"type":"Base Building Area"},{"areaSquareFeet":1140,"type":"Adjusted Building Area"},{"areaSquareFeet":1492,"type":"Zillow Calculated Finished Area"},{"areaSquareFeet":348,"type":"Addition 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County","pools":[],"censusTract":"390170118002005","areas":[{"areaSquareFeet":1492,"type":"Living Building Area"},{"areaSquareFeet":1144,"type":"Base Building Area"},{"areaSquareFeet":1140,"type":"Adjusted Building Area"},{"areaSquareFeet":1492,"type":"Zillow Calculated Finished Area"},{"areaSquareFeet":348,"type":"Addition Area"}],"building":[{"airConditioning":"Central","foundation":null,"architecturalStyle":"Ranch/Rambler","yearBuilt":1965,"fireplace":null,"noOfUnits":1,"effectiveYearBuilt":null,"sewer":"Municipal/Public","heating":"Central","class":null,"comments":null,"quarterBaths":null,"totalStories":1,"kitchens":2,"water":"Municipal/Public","classDescription":null,"quality":"C-","totalRooms":5,"bedrooms":3,"condition":"Average","baths":null,"threeQuarterBaths":null,"halfBaths":null,"occupancyStatus":null,"fullBaths":1}],"lotSizeFrontage":null,"parcelID":"112166032","marketValueYear":2002,"lotTopography":"Rocky","ownerName":["ROBERT D SUTTON"],"taxYear":2002,"marketTotalValue":102590,"taxID":null,"taxExemption":null,"legal":{"phase":null,"tract":null,"city":null,"municipality":null,"section":null,"lot":null,"otherLot":null,"unit":null,"lotDescription":"1141 ENT","district":null,"block":null,"subdivisionName":null,"township":null},"id":"112166032-2002","state":"OH","lotSizeDepth":null,"apn":"R8000-017.000-071","marketImprovementValue":78830,"totalValue":35907,"address":{"zip":"45067","city":"Trenton","zip4":"1117","streetPre":null,"house":"431","unitType":null,"unit":null,"street":"Kenwood","houseExt":null,"streetSuffix":"Ln","state":"OH","streetPost":null,"full":" 431 Kenwood Ln Trenton OH 45067"},"landUseCode":"RR101","landUseGeneral":"RR","coordinates":[-84.465074,39.489885],"zpid":"33237764","fips":"39017","landValue":8316,"zoningCode":null,"lotSizeAcres":0.27,"garages":[],"improvementValue":27591,"taxAmount":1352.82,"lotSizeSquareFeet":11761.2,"url":"api.bridgedataoutput.com/api/v2/pub/assessments/112166032-2002"},{"landUseDescription":"Single Family Residential","zoningDescription":null,"year":2011,"marketLandValue":29380,"numberOfBuildings":1,"lotSizeIrregular":"85 X 138","county":"Butler County","pools":[],"censusTract":"390170118002005","areas":[{"areaSquareFeet":1492,"type":"Living Building Area"},{"areaSquareFeet":1144,"type":"Base Building Area"},{"areaSquareFeet":1140,"type":"Adjusted Building Area"},{"areaSquareFeet":1492,"type":"Zillow Calculated Finished Area"},{"areaSquareFeet":348,"type":"Addition 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CodePudding user response：

Decoding JSON into php is a mulish operation: it's a cross between a Javascript horse and a php donkey. So it can get a little confusing I think, if not stubborn.

Here are two ways to add up the square footage buried in your JSON object.

/* php objects */
$ResponseInfo = json_decode( $json, false );
$sqft = 0;
foreach ( $ResponseInfo->bundle as $bundle ) {
  foreach ( $bundle->areas as $area ) {
    $sqft  = $area->areaSquareFeet;
  }
}

/* php traditional associative arrays */
$ResponseInfo = json_decode( $json, true );
$sqft         = 0;
foreach ( $ResponseInfo['bundle'] as $bundle ) {
  foreach ( $bundle['areas'] as $area ) {
    $sqft  = $area['areaSquareFeet'];
  }
}

In either case when you start with the $ResponseInfo output of json_decode you must navigate explicitly from the top level of that object to the data you need. This sort of expression doesn't do that.

$sqft = $ResponseInfo->building[0]->squarefeet;

building isn't a member of that decoded object, and there's no member called squarefeet in your JSON.

CodePudding user response：

This post is a sh*t show, so I am sorry if I only glanced through it, please use a code block so we can actually address the problem and not have a bunch of data spammed in front of us that is most likely useless to the problem at hand.

it seems like you are using stdClass Object which may be throwing you off (just a guess at this point).

If you want to convert the data fully into an stdClass Object or fully into an array for easier manageability ; you can use either one of the functions below:

function array_to_stdClass(&$array){
    $tmp = $array;
    $array = new stdClass();
    foreach($tmp as $k => $v) $array->$k = (!is_object($v) && !is_array($v)) ? $v:array_to_stdClass($v);
    return $array;
}

function stdClass_to_array(&$stdClass){
    $tmp = $stdClass;
    $stdClass = array();
    foreach($tmp as $k => $v) $stdClass[$k] = (!is_object($v) && !is_array($v)) ? $v:stdClass_to_array($v);
    return $stdClass;
}

Live Demo/Example here: https://onlinephp.io/c/2d00a