PHP

Get the Index of a JSON Member

See more JSON Examples

This example demonstrates how to get the index of a given member by name.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Chilkat2 PHP

<?php

use Chilkat2\JsonObject;

$json = new JsonObject();

// This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
// The presence of whitespace chars for pretty-printing makes no difference to the Load
// method.
$jsonStr = '{"name": "donut","image":{"fname": "donut.jpg","w": 200,"h": 200},"thumbnail":{"fname": "donutThumb.jpg","w": 32,"h": 32}}';

try {
    $json->Load($jsonStr);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// The top-level JSON object has three members: name, image, and thumbnail.
$nameIndex = $json->IndexOf('name');
// The index of the "name" member is 0.
echo 'nameIndex = ', $nameIndex, "\n";

$thumbIndex = $json->IndexOf('thumbnail');
// The index of the "thumbnail" member is 2.
echo 'thumbIndex = ', $thumbIndex, "\n";

// The "fname" member is NOT a direct member of the top-level JSON object.
// It is a member of a nested object.  If we try to get the index of this
// member using the top-level JSON object, it is not found (and returns -1).
$fnameIndex = $json->IndexOf('fname');
// The fnameIndex is -1 (not found).  This is correct.
echo 'fnameIndex = ', $fnameIndex, "\n";

// Get the "image" object.
$imageObj = new JsonObject();
$json->ObjectOf2('image', $imageObj);

// Now we can get the index of the "fname" object, because it is a direct
// member of the "image" object:
$fnameIndex = $imageObj->IndexOf('fname');
echo 'fnameIndex = ', $fnameIndex, "\n";