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(PHP ActiveX) Get the Root of a JSON DocumentDemonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document: { "flower": "tulip", "abc": { "x": [ { "a" : 1 }, { "b1" : 100, "b2" : 200 }, { "c" : 3 } ], "y": 200, "z": 200 } }
<?php // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject') $json = new COM("Chilkat.JsonObject"); $jsonStr = '{\'flower\': \'tulip\',\'abc\':{\'x\': [{ \'a\' : 1 },{ \'b1\' : 100, \'b2\' : 200 },{ \'c\' : 3 }],\'y\': 200,\'z\': 200}}'; $success = $json->Load($jsonStr); if ($success != 1) { print $json->LastErrorText . "\n"; exit; } // Get the "abc" object. // abcObj is a Chilkat.JsonObject $abcObj = $json->ObjectOf('abc'); if ($json->LastMethodSuccess == 0) { print 'abc object not found.' . "\n"; exit; } // Side note: The JSON of a sub-part of the document can be emitted from any JSON object: $abcObj->EmitCompact = 0; print $abcObj->emit() . "\n"; // Navigate to the "x" array // xArray is a Chilkat.JsonArray $xArray = $abcObj->ArrayOf('x'); // We'll skip the null check and assume it's non-null... // Navigate to the 2nd object contained within the array. This contains members b1 and b2 // bObj is a Chilkat.JsonObject $bObj = $xArray->ObjectAt(1); // We'll skip the null check and assume it's non-null... // Show that we're at "b1/b2". // The value of "b1" should be "200" print 'b2 = ' . $bObj->IntOf('b2') . "\n"; // Now go back to the JSON doc root: // docRoot is a Chilkat.JsonObject $docRoot = $bObj->GetDocRoot(); // We'll skip the null check and assume it's non-null... // Pretty-print the JSON doc from the root to show that this is indeed the root. $docRoot->EmitCompact = 0; print $docRoot->emit() . "\n"; ?> |
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