PHP

Check if Integer Exists at JSON Path

Demonstrates how to get an integer value at a JSON path, and how to check to see if it exists. Chilkat2 PHP

<?php

use Chilkat2\JsonObject;

$json = new JsonObject();

// First build simple JSON..
$json->UpdateInt('test.abc', 100);

$json->EmitCompact = false;
echo $json->Emit(), "\n";

// This is our JSON:
// {
//   "test": {
//     "abc": 100,
//   }
// }

$path = 'test.notHere';

// The call to IntOf will return 0, because it's not present.
// But how do we know if it really was present, and the value was truly 0?
$val = $json->IntOf($path);
echo 'val = ', $val, "\n";

// We cannot use LastMethodSuccess because LastMethodSuccess only applies
// to methods that:
// - return a string
// - return a new Chilkat object, binary bytes, or a date/time.
// - returns a boolean status where true = success and false = failed.
// - returns an integer where failure is defined by a return value less than zero.
// The IntOf method fits none of these requirements, and therefore the LastMethodSuccess
// is not a valid indicator..
$wasFound = $json->LastMethodSuccess;
echo 'wasFound = ', ($wasFound ? 'true' : 'false'), " (not a valid indicator)\n";

// Instead, if the returned value is 0, we can double-check to see if the member was truly there..
if ($val == 0) {
    $wasFound = $json->HasMember($path);
    echo 'wasFound = ', ($wasFound ? 'true' : 'false'), "\n";
    if ($wasFound) {
        echo "The value was present and is 0.\n";
    } else {
        echo "no member is present at test.notHere\n";
    }
} else {
    echo 'val = ', $val, "\n";
}

// Alternatively, you could check to see if the member exists beforehand..
if ($json->HasMember($path)) {
    echo 'val = ', $json->IntOf($path), "\n";
} else {
    echo 'no member at ', $path, "\n";
}