PHP ActiveX

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. PHP ActiveX

<?php

$success = 0;

$json = new COM("Chilkat.JsonObject");

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

$json->EmitCompact = 0;
print $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);
print '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 1 = success and 0 = 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;
print 'wasFound = ' . $wasFound . ' (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);
    print 'wasFound = ' . $wasFound . "\n";
    if ($wasFound == 1) {
        print 'The value was present and is 0.' . "\n";
    }
    else {
        print 'no member is present at test.notHere' . "\n";
    }

}
else {
    print 'val = ' . $val . "\n";
}

// Alternatively, you could check to see if the member exists beforehand..
if ($json->HasMember($path) == 1) {
    print 'val = ' . $json->IntOf($path) . "\n";
}
else {
    print 'no member at ' . $path . "\n";
}


?>