PHP ActiveX

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
    }
}

PHP ActiveX

<?php

$success = 0;

$json = new COM("Chilkat.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}}';

$success = $json->Load($jsonStr);
if ($success == 0) {
    print $json->LastErrorText . "\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.
print 'nameIndex = ' . $nameIndex . "\n";

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

// Get the "image" object.
$imageObj = new COM("Chilkat.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');
print 'fnameIndex = ' . $fnameIndex . "\n";

?>