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(PHP Extension) Get the Index of a JSON MemberThis 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 // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); $json = new CkJsonObject(); // 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 != true) { 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 is a CkJsonObject $imageObj = $json->ObjectOf('image'); if ($json->get_LastMethodSuccess() == false) { print 'image object not found.' . "\n"; exit; } // 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"; ?> |
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