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Google Map V3 Cakephp helper and multiple markers
<?php
echo $this->GoogleMapV3->map();
foreach ($allcondos as $condo) {
    $options = array(
    'lat' => $condo['Unit']['lat'],
    'lng' => $condo['Unit']['lon']
    );
    $this->GoogleMapV3->addMarker($options);
}
?>

foreach ($allcondos as $condo) {
    $lat=$condo['Unit']['lat'];
    $lon=$condo['Unit']['lon'];
    $options = array(
    'lat' => $lat,
    'lng' => $lon
    );
    $this->GoogleMapV3->addMarker($options);
}

<?php
    class AppController extends Contoller{
        public $helpers = array('Html','Javascript','GoogleMapV3');
    }
?>

<?php
    class DemoController extends AppContoller{

        function map() {
            $this->helpers[] = 'GoogleMapV3';
            #   rest of your code
        }
    }
?

<?php
    echo '<script type="text/javascript" src="'.$this->GoogleMapV3->apiUrl().'"></script>';
?>

<?php echo $this->GoogleMapV3->map(array('div'=>array('id'=>'my_map', 'height'=>'400', 'width'=>'100%'))); ?>

<?php echo $this->GoogleMapV3->map(array('map'=>array(
            'defaultLat' => 40, # only last fallback, use Configure::write('Google.lat', ...); to define own one
            'defaultLng' => -74, # only last fallback, use Configure::write('Google.lng', ...); to define own one
            'defaultZoom' => 5,
        ),'div'=>array('id'=>'my_map', 'height'=>'400', 'width'=>'100%'))); ?>

<?php
    $options = array(
    'lat'=>40.770272,
    'lng'=>-73.974037,
        'title' => 'Some title', # optional
        'content' => '<b>HTML</b> Content for the Bubble/InfoWindow' # optional
    );
    $this->GoogleMapV3->addMarker($options);
?>

<?php echo $this->GoogleMapV3->script() ?>