(PHP Extension) JSON Paths

Demonstrates using "Chilkat JSON Paths" to access parts of a JSON document, or to iterate over parts.

This example uses the following JSON document:

{
    "nestedArray" : [
			[
				[1,2,3],
				[4,5,6],
				[7,8,9,10]
			],
			[
				[11,12,13],
				[14,15,16],
				[17,18,19,20]
			],
			[
				[21,22,23],
				[24,25,26],
				[27,28,29,30],
				[31,32,33,34,35,36]
			]
		],

	"nestedObject" : {
		"aaa" : {
			"bb1" : {
				"cc1" : "c1Value",
				"cc2" : "c2Value",
				"cc3" : "c3Value"
			},
			"bb2" : {
				"dd1" : "d1Value",
				"dd2" : "d2Value",
				"dd3" : "d3Value"
			}
		}
	},

	"mixture" : {
		"arrayA" : [  
			{ "fruit": "apple", "animal": "horse", "job": "fireman", "colors": ["red","blue","green"] },
			{ "fruit": "pear", "animal": "plankton", "job": "waiter", "colors": ["yellow","orange","purple"] },
			{ "fruit": "kiwi", "animal": "echidna", "job": "astronaut", "colors": ["magenta","tan","pink"] }
			]
	},


        "name.with.dots" : { "grain" : "oats" }

	
}

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?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();
$json->put_EmitCompact(false);

// Assume the file contains the data as shown above..
$success = $json->LoadFile('qa_data/json/pathSample.json');
if ($success != true) {
    print $json->lastErrorText() . "\n";
    exit;
}

// First, let's get the value of "cc1"
// The path to this value is: nestedObject.aaa.bb1.cc1
print $json->stringOf('nestedObject.aaa.bb1.cc1') . "\n";

// Now let's get number 18 from the nestedArray.
// It is located at nestedArray[1][2][1]
// (remember: Indexing is 0-based)
print 'This should be 18: ' . $json->IntOf('nestedArray[1][2][1]') . "\n";

// We can do the same thing in a more roundabout way using the 
// I, J, and K properties.  (The I,J,K properties will be convenient
// for iterating over arrays, as we'll see later.)
$json->put_I(1);
$json->put_J(2);
$json->put_K(1);
print 'This should be 18: ' . $json->IntOf('nestedArray[i][j][k]') . "\n";

// Let's iterate over the array containing the numbers 17, 18, 19, 20.
// First, use the SizeOfArray method to get the array size:
$sz = $json->SizeOfArray('nestedArray[1][2]');
// The size should be 4.
print 'size of array = ' . $sz . ' (should equal 4)' . "\n";

// Now iterate...

for ($i = 0; $i <= $sz - 1; $i++) {
    $json->put_I($i);
    print $json->IntOf('nestedArray[1][2][i]') . "\n";
}

// Let's use a triple-nested loop to iterate over the nestedArray:

// szI should equal 1.
$szI = $json->SizeOfArray('nestedArray');
for ($i = 0; $i <= $szI - 1; $i++) {
    $json->put_I($i);

    $szJ = $json->SizeOfArray('nestedArray[i]');
    for ($j = 0; $j <= $szJ - 1; $j++) {
        $json->put_J($j);

        $szK = $json->SizeOfArray('nestedArray[i][j]');
        for ($k = 0; $k <= $szK - 1; $k++) {
            $json->put_K($k);

            print $json->IntOf('nestedArray[i][j][k]') . "\n";
        }

    }

}

// Now let's examine how to navigate to JSON objects contained within JSON arrays.
// This line of code gets the value "kiwi" contained within "mixture"
print $json->stringOf('mixture.arrayA[2].fruit') . "\n";

// This line of code gets the color "yellow"
print $json->stringOf('mixture.arrayA[1].colors[0]') . "\n";

// Getting an object at a path:
// This gets the 2nd object in "arrayA"
// obj2 is a CkJsonObject
$obj2 = $json->ObjectOf('mixture.arrayA[1]');
// This object's "animal" should be "plankton"
print $obj2->stringOf('animal') . "\n";

// Note that paths are relative to the object, not the absolute root of the JSON document.
// Starting from obj2, "purple" is at "colors[2]"
print $obj2->stringOf('colors[2]') . "\n";

// Getting an array at a path:
// This gets the array containing the colors red, green, blue:
// arr1 is a CkJsonArray
$arr1 = $json->ArrayOf('mixture.arrayA[0].colors');
$szArr1 = $arr1->get_Size();
for ($i = 0; $i <= $szArr1 - 1; $i++) {
    print $i . ': ' . $arr1->stringAt($i) . "\n";
}

// The Chilkat JSON path uses ".", "[", and "]" chars for separators.  When a name
// contains one of these chars, use double-quotes in the path:
print $json->stringOf('\'name.with.dots\'.grain') . "\n";

?>