Orlando Orlando - 4 months ago 7
PHP Question

PHP JSON converter "Unsupported operand types" error

I want to create a converter which takes a geoJSON file as input and divides every coordinate by 1000 and then returns the geoJSON back.

The code:

// Copy file content into a string var
$Json_File = file_get_contents("static/data/pol_gem.json");
// Convert the string to a json object
$Json = json_decode($Json_File);

//Declare features variable
$JSONFeatures = array();

//Loop through each feature
foreach ($Json->features as $Feature)
{
//Create array which contains coordinate data of feature
$CoordinateData = array();

//Loop through each coordinate pair of feature
foreach ($Feature->geometry->coordinates as $Coordinates)
{
//Create scaled coordinate pair array
$ScaledCoordinates = array();

//Loop through every coordinate of coordinate pair
foreach ($Coordinates as $Coordinate)
{
//Divide coordinate
$ScaledCoordinate = $Coordinate / 1000.00; // ****** ERROR LINE ******
//add coordinate to coordinate pair array
$ScaledCoordinates[] = $ScaledCoordinate;
}

//Add coordinate pair array to coordinate array of feature
$CoordinateData[] = $ScaledCoordinates;
}

//Build feature JSON
$CurrentFeature = [
"type" => "Feature",
"geometry" => [
"type" => "Polygon",
"coordinates" => $CoordinateData,
"properties" => $Feature->properties
]
];

//Add current feature to features array
$JSONFeatures[] = $CurrentFeature;
}

//Create JSON File
$JSONMapData = [
"type" => "FeatureCollection",
"features" => $JSONFeatures
];


I get the error: " Unsupported operand types
500 Internal Server Error - FatalThrowableError ".

It returns the same JSON as the input file without errors if I remove the "/ 1000.00".

The geoJSON input file "static/data/pol_gem.json" (too large for pastebin):

pol_gem.json

JSON only with 1 feature:

{"type":"FeatureCollection","features":[
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[-33797.1,216324.69],[-33803.19,216328.5],[-33804.84,216329.53],[-33806.911211649945,216330.8245072812],[-33808.92,216332.08],[-33810.4,216333],[-33813.93,216336.22],[-33815.5938169951,216337.4602241875],[-33825.91,216345.15],[-33830.36,216348.46],[-33831.25,216349.12],[-33833.44,216350.75],[-33834.35,216351.43],[-33891.6,216403.36],[-33909.22,216419.65],[-33905.33,216424.09],[-33904.411,216425.138],[-33893.671,216437.383],[-33889.59,216442.11],[-33885.88,216445.99],[-33877.94,216455.2],[-33868.95,216465.2],[-33859.28,216475.97],[-33853.93,216481.92],[-33850.92,216485.27],[-33844.864,216492.01],[-33837.684,216500],[-33799.01,216543.04],[-33796.487,216545.791],[-33789.553,216553.352],[-33773.081,216571.312],[-33764.312,216580.874],[-33759.633,216585.976],[-33756.871,216588.988],[-33750,216596.541],[-33746.58,216600.3],[-33741.58,216605.84],[-33719.43,216630.31],[-33715.39,216634.56],[-33712.6,216637.49],[-33704.69,216632.22],[-33689.67,216622.85],[-33607.81,216574.76],[-33584.26,216559.32],[-33570.37,216549.14],[-33549.24,216530.06],[-33542.59,216524.02],[-33533.99,216515.37],[-33530.58,216511.55],[-33528.12,216514.42],[-33527.67,216515.14],[-33512.48,216539.47],[-33512.36,216539.67],[-33509.421,216550.085],[-33507.54,216556.75],[-33498.2,216588.55],[-33488.34,216624.34],[-33486.14,216636.31],[-33515.9,216691.96],[-33433.36,216763.54],[-33413.61,216744.95],[-33396.69,216729.22],[-33392.98,216715.88],[-33383.5,216710.91],[-33368.48,216695.13],[-33356.5,216677.58],[-33338.6,216662.98],[-33321.37,216647.08],[-33317.05,216645.21],[-33309.01,216641.73],[-33274.64,216626.87],[-33251.88,216613.45],[-33243.92,216607.93],[-33239.29,216604.71],[-33214.66,216585.1],[-33213.54,216582.77],[-33193.66,216558.77],[-33188.37,216552.28],[-33184.35,216547.43],[-33180.14,216542.2],[-33156.93,216511.72],[-33152.3,216509.58],[-33131.529,216500],[-33125,216496.989],[-33105.25,216487.88],[-33089.11,216480.48],[-33077.943,216500],[-33076.89,216501.84],[-33075.67,216503.98],[-33063.8,216524.72],[-33088.12,216550.71],[-33066.71,216573.69],[-33062.47,216570.31],[-33043.67,216555.35],[-33030.31,216544.71],[-33020.03,216536.53],[-33005.96,216525.66],[-32988.8,216512.45],[-32972.189,216500],[-32946.84,216481],[-32931.85,216468.06],[-32930.5,216466.94],[-32898.59,216440.54],[-32897.68,216440.04],[-32895.82,216439.14],[-32861.76,216422.72],[-32841.05,216412.82],[-32760.41,216374.82],[-32755.91,216371.09],[-32726.07,216346.78],[-32721.65,216343.17],[-32721.55,216343.09],[-32606.01,216282.74],[-32602.71,216282.09],[-32500,216259.116],[-32496.04,216258.23],[-32500,216232.449],[-32502.74,216214.61],[-32500,216214.368],[-32422.19,216207.49],[-32317.69,216208.78],[-32308.34,216208.26],[-32299.33,216208.22],[-32287.32,216208.97],[-32272,216211.21],[-32260.27,216208.38],[-32224.03,216207.29],[-32224.02,216204.75],[-32223.03,216197.67],[-32210.447,216197.782],[-32203.91,216197.84],[-32187.2,216197.99],[-32188.5,216209.2],[-32171.83,216205.85],[-32158.72,216203.22],[-32138.64,216198.99],[-32132.33,216197.66],[-32111.621,216188.028],[-32107.11,216185.93],[-32102.13,216183.91],[-32076.34,216181.75],[-32067.59,216180.33],[-32061.67,216179.37],[-32070.1,216151.04],[-32072.4,216143.06],[-32043.66,216138.19],[-32043.54,216138.17],[-32020.95,216133.86],[-31997.94,216129.6],[-31994.15,216145.38],[-31975.25,216145.39],[-31962.33,216145.4],[-31949.33,216145.41],[-31942.33,216145.41],[-31930.11,216148.87],[-31922.17,216151.11],[-31916.65,216152.68],[-31896,216156.46],[-31887.58,216157.66],[-31875,216159.477],[-31869.09,216160.33],[-31862.82,216161.22],[-31846.54,216164.31],[-31824.48,216167.54],[-31818.11,216168.47],[-31807.86,216171.47],[-31806.16,216171.97],[-31799.66,216173.91],[-31791.21,216176.39],[-31756.686,216187.196],[-31755.78,216187.48],[-31755.439,216187.587],[-31753.07,216188.33],[-31744.48,216187.18],[-31740.499135574093,216182.9988626065],[-31733.15,216175.28],[-31714.68,216163.7],[-31714.13,216163.35],[-31710.94258021671,216167.46137364558],[-31706.92,216172.65],[-31706.834004814245,216173.9542603173],[-31706.743145447377,216175.3322940481],[-31706.62,216177.2],[-31706.51572213893,216181.66656838247],[-31706.488442557707,216182.83504377818],[-31706.44,216184.91],[-31706.17,216191.66],[-31706.1,216193.45],[-31705.99,216196.27],[-31704.39,216200.84],[-31699.587223010694,216214.52462484624],[-31698.55,216217.48],[-31691.53,216218.6],[-31705.585816937597,216226.4058169376],[-31717.82,216233.2],[-31732.85665213545,216241.54603168985],[-31732.88159201141,216241.55987446505],[-31735.26,216242.88],[-31737.73,216243.25],[-31737.36,216245.95],[-31735.07,216262.54],[-31737.639,216271.579],[-31738.48,216274.54],[-31747.85,216275.75],[-31757.77,216299.47],[-31759.11,216302.41],[-31759.32,216319.01],[-31770.84,216331.77],[-31772.63,216346.97],[-31774.714,216356.721],[-31775.72,216361.43],[-31781.29,216369.37],[-31781.17327643576,216372.41333263853],[-31779.92,216405.09],[-31764.843558931334,216407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]}

Answer

As @deceze said, I the $Coordinate variable is an array.

This is my solution code:

public function ConvertmapAction()
{
    // Copy file content into a string var
    $Json_File = file_get_contents("static/data/pol_gem.json");
    // Convert the string to a json object
    $Json = json_decode($Json_File);

    //Declare features variable
    $JSONFeatures = array();

    //Loop through each feature
    foreach ($Json->features as $Feature)
    {
        //Create array which contains coordinate data of feature
        $CoordinateData = array();

        //Loop through each coordinate pair of feature
        foreach ($Feature->geometry->coordinates as $Coordinates)
        {
            //Create scaled coordinate pair array
            $ScaledCoordinates = array();

            //Loop through every coordinate of coordinate pair
            foreach ($Coordinates as $Coordinate)
            {
                if(is_array($Coordinate))
                {
                    $CoordinateArray = array();
                    foreach ($Coordinate as $CoordinatePoint)
                    {
                        $CoordinateArray[] = ($CoordinatePoint / 1000.00);
                    }
                    $ScaledCoordinates[] = $CoordinateArray;
                }
                else
                {
                    //Divide coordinate
                    $ScaledCoordinate = $Coordinate;
                    //add coordinate to coordinate pair array
                    $ScaledCoordinates[] = $ScaledCoordinate;
                }
            }

            //Add coordinate pair array to coordinate array of feature
            $CoordinateData[] = $ScaledCoordinates;
        }

        //Build feature JSON
        $CurrentFeature = [
            "type" => "Feature",
            "geometry" => [
                "type" => "Polygon",
                "coordinates" => $CoordinateData,
                "properties" => $Feature->properties
            ]
        ];

        //Add current feature to features array
        $JSONFeatures[] = $CurrentFeature;
    }

    //Create JSON File
    $JSONMapData = [
            "type" => "FeatureCollection",
            "features" => $JSONFeatures
    ];

    return new JsonResponse($JSONMapData);
}