searching a json file - php

Question

I have a file test.json see below
[
{
"ID": "01AD003",
"Name": "ST. FRANCIS RIVER AT OUTLET OF GLASIER LAKE",
"Latitude": 47.20661,
"Longitude": -68.95694,
"Prov": "NB",
"Timezone": "UTC-04:00"
},
{
"ID": "01AD004",
"Name": "SAINT JOHN RIVER AT EDMUNDSTON",
"Latitude": 47.36078,
"Longitude": -68.32489,
"Prov": "NB",
"Timezone": "UTC-04:00"
},
{
"ID": "01AF002",
"Name": "SAINT JOHN RIVER AT GRAND FALLS",
"Latitude": 47.03889,
"Longitude": -67.73972,
"Prov": "NB",
"Timezone": "UTC-04:00"
}
]
I am trying to search this file based on the ID element and return the Latitude and Longitude using php
I have tried adding a string local:
function getLatLong($id)
{
$str = file_get_contents("./hydrometric_StationList.json");
$json = json_decode($str);
foreach($json->local as $item)
{
if($item->ID == $id)
{
return $item->Latitude.",".$item.Latitude;
}
}
}

Answer 1

You can use true as the second parameter on json_decode to decode it as assositive array instead of an object. You can do a simple foreach loop like:
function getLatLong($id)
{
$str = file_get_contents("./hydrometric_StationList.json");
$json = json_decode($str, true);
foreach($json as $item)
{
if($item['ID'] == $id)
{
return $item['Latitude'].",".$item['Latitude'];
}
}
}
echo getLatLong("01AF002"); will result to: 47.03889,47.03889

Answer 2

There are a couple of mistakes in your code.
In your foreach() you have $json->local, but local isn't in the data. Just remove the ->local part.
In the return you have $item.Latitude, which both shouldn't be a . and is returning the latitude again, so change this to $item->Longitude...
function getLatLong($id)
{
$str = file_get_contents("./hydrometric_StationList.json");
$json = json_decode($str);
foreach($json->local as $item)
{
if($item->ID == $id)
{
return $item->Latitude.",".$item->Longitude;
}
}
}