{source}
<?php
$extrafields = array();
foreach($item->extra_fields as $item)
{    
$extrafields[$item->id] = $item->value;
echo "<script>alert('$item->value');</script>"; 
} 
?>
{/source}

{source}
<?php
$item_extra_fields = json_decode($item->extra_fields);
$put_your_extra_field1_name_here = $item_extra_fields[0]->value;
echo $put_your_extra_field1_name_here;
?>
{/source}

{source}
<?php
echo "<script>alert('$item->title');</script>";
?>
{/source}

{source}
<?php
$something = count($item->extra_fields)
echo "<script>alert('$something');</script>";
?>
{/source}

$this->item->extraFields

$item->extraFields

count($item->extra_fields)